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Organic Chemistry Test 1 Study Guidance: Chapters 14–16

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Q1. Arrange the following compounds in order of increasing boiling point (lowest to highest). Explain your reasoning.

  • CH3CH2C(O)CH2CH3

  • CH3(CH2)4CH3

  • CH3(CH2)4OH

  • CH3CH2CH2OCH2CH3

Background

Topic: Physical Properties of Organic Compounds

This question tests your understanding of how molecular structure and functional groups affect boiling points, including the roles of hydrogen bonding, molecular weight, and polarity.

Key Terms:

  • Hydrogen bonding

  • Dipole-dipole interactions

  • London dispersion forces

  • Functional groups (alcohol, ketone, ether, alkane)

Step-by-Step Guidance

  1. Identify the functional group present in each compound (e.g., alcohol, ketone, ether, alkane).

  2. Recall that alcohols can form hydrogen bonds, which generally increase boiling point.

  3. Compare the molecular weights of the compounds; higher molecular weight can increase boiling point due to stronger London dispersion forces.

  4. Consider the polarity of each compound and the types of intermolecular forces present (hydrogen bonding > dipole-dipole > London dispersion).

  5. Arrange the compounds based on the strength of their intermolecular forces and molecular weight, but stop before finalizing the order.

Try solving on your own before revealing the answer!

Q2. Write formulas for the following compounds (include stereochemistry where needed):

  • cis-2,3-diethyl-2-methyloxirane

  • Benzyl butyl ether

Background

Topic: Nomenclature and Structure Drawing

This question tests your ability to interpret IUPAC names and draw the correct structural formulas, including stereochemistry.

Key Terms:

  • cis/trans isomerism

  • Oxirane (epoxide ring)

  • Benzyl group

  • Ether functional group

Step-by-Step Guidance

  1. Break down the name "cis-2,3-diethyl-2-methyloxirane" to identify the parent structure (oxirane) and the substituents (diethyl, methyl).

  2. Draw the oxirane ring and place the substituents at the correct positions, ensuring the cis configuration.

  3. For "Benzyl butyl ether," identify the benzyl group and the butyl group, then connect them via an oxygen atom to form the ether.

  4. Check for any stereochemistry requirements and indicate them in your drawing.

Try solving on your own before revealing the answer!

Q3. Name the following compound (include stereochemistry where needed): (CH3)2CHOCH2Cl. Give two names - IUPAC and common names.

Background

Topic: Nomenclature of Organic Compounds

This question tests your ability to apply IUPAC rules and recognize common names for organic compounds, including functional groups and substituents.

Key Terms:

  • IUPAC nomenclature

  • Common names

  • Functional groups (ether, alkyl halide)

Step-by-Step Guidance

  1. Identify the longest carbon chain and the functional groups present (ether and chloride).

  2. Assign numbers to the carbon chain to give the substituents the lowest possible numbers.

  3. Write the IUPAC name based on the structure and substituents.

  4. Recall the common name for the compound based on its structure (e.g., alkyl groups attached to oxygen).

Try solving on your own before revealing the answer!

Q4. Show how you would synthesize the following compound starting with ONLY alkyl halides and alcohols. Show EACH step of the synthesis.

Background

Topic: Organic Synthesis

This question tests your ability to design a synthetic route using specified starting materials (alkyl halides and alcohols), including reaction mechanisms and reagents.

Key Terms:

  • Alkyl halide

  • Alcohol

  • Substitution reactions

  • SN2/SN1 mechanisms

Step-by-Step Guidance

  1. Identify the target compound and its functional groups.

  2. Determine which alkyl halides and alcohols could be used to construct the target molecule.

  3. Outline the sequence of reactions needed (e.g., nucleophilic substitution, ether formation).

  4. Write out the reaction steps, including reagents and conditions, but stop before the final product.

Try solving on your own before revealing the answer!

Q5. Predict the products of the following reaction.

Background

Topic: Reaction Mechanisms and Product Prediction

This question tests your ability to analyze a given reaction and predict the major organic product(s) based on the reactants and conditions.

Key Terms:

  • Reaction mechanism

  • Major/minor products

  • Regioselectivity

  • Stereochemistry

Step-by-Step Guidance

  1. Identify the type of reaction (e.g., substitution, addition, elimination) based on the reactants and conditions.

  2. Draw the starting material and consider possible reaction pathways.

  3. Predict the major product based on the mechanism and regioselectivity.

  4. Consider any stereochemical outcomes, but stop before drawing the final product.

Try solving on your own before revealing the answer!

Q6. Predict the products of the following reaction.

Background

Topic: Reaction Mechanisms and Product Prediction

This question tests your ability to analyze a given reaction and predict the major organic product(s) based on the reactants and conditions.

Key Terms:

  • Reaction mechanism

  • Major/minor products

  • Regioselectivity

  • Stereochemistry

Step-by-Step Guidance

  1. Identify the type of reaction (e.g., substitution, addition, elimination) based on the reactants and conditions.

  2. Draw the starting material and consider possible reaction pathways.

  3. Predict the major product based on the mechanism and regioselectivity.

  4. Consider any stereochemical outcomes, but stop before drawing the final product.

Try solving on your own before revealing the answer!

Q7. Show how you would convert hex-1-ene to 1-methoxyhexan-2-ol. You may use any additional reagents and solvents you need. Show each step in the synthesis (if there is more than one step).

Background

Topic: Multi-Step Organic Synthesis

This question tests your ability to plan a synthetic route from a simple alkene to a more complex alcohol and ether, using appropriate reagents and mechanisms.

Key Terms:

  • Alkene

  • Alcohol

  • Ether

  • Regioselectivity

  • Reaction sequence

Step-by-Step Guidance

  1. Identify the functional groups in the target molecule (alcohol and ether).

  2. Determine the transformations needed (e.g., alkene hydration, ether formation).

  3. Choose appropriate reagents for each step (e.g., acid-catalyzed hydration, Williamson ether synthesis).

  4. Outline the sequence of reactions, but stop before the final product.

Try solving on your own before revealing the answer!

Q8. State whether the following compound is cumulated, conjugated, or isolated.

Background

Topic: Conjugation in Organic Molecules

This question tests your understanding of the different types of pi bond arrangements: cumulated, conjugated, and isolated systems.

Key Terms:

  • Cumulated diene

  • Conjugated diene

  • Isolated diene

Step-by-Step Guidance

  1. Examine the structure of the compound and locate the double bonds.

  2. Determine the relationship between the double bonds (adjacent, separated by single bonds, or separated by more than one bond).

  3. Classify the compound as cumulated, conjugated, or isolated based on the arrangement, but stop before stating which one.

Try solving on your own before revealing the answer!

Q9. Circle the allylic carbons in the following compound.

Background

Topic: Allylic Position in Organic Molecules

This question tests your ability to identify allylic carbons, which are carbons adjacent to a double bond.

Key Terms:

  • Allylic carbon

  • Double bond

Step-by-Step Guidance

  1. Locate the double bond(s) in the compound.

  2. Identify the carbons directly attached to the double bond (vinylic carbons).

  3. Find the carbons adjacent to the vinylic carbons; these are the allylic carbons.

Try solving on your own before revealing the answer!

Q10. Predict the major product(s) of the following reaction.

Background

Topic: Electrophilic Addition to Conjugated Dienes

This question tests your ability to predict the outcome of reactions involving conjugated dienes, including regioselectivity and resonance stabilization.

Key Terms:

  • Conjugated diene

  • Electrophilic addition

  • 1,2- and 1,4-addition products

Step-by-Step Guidance

  1. Identify the conjugated diene in the starting material.

  2. Determine the electrophile and nucleophile involved in the reaction.

  3. Draw the possible resonance-stabilized carbocation intermediates.

  4. Predict the major product(s) based on the mechanism, but stop before drawing the final product.

Try solving on your own before revealing the answer!

Q11. Predict the TWO products for the following reaction.

Background

Topic: Electrophilic Addition to Conjugated Dienes

This question tests your ability to predict both 1,2- and 1,4-addition products in reactions involving conjugated dienes.

Key Terms:

  • Conjugated diene

  • Electrophilic addition

  • 1,2- and 1,4-addition products

Step-by-Step Guidance

  1. Identify the conjugated diene in the starting material.

  2. Determine the electrophile and nucleophile involved in the reaction.

  3. Draw the possible resonance-stabilized carbocation intermediates.

  4. Predict the two possible products (1,2- and 1,4-addition), but stop before drawing the final products.

Try solving on your own before revealing the answer!

Q12. Draw the resonance structures for the following cation.

Background

Topic: Resonance Structures

This question tests your ability to draw all valid resonance structures for a given cation, showing electron delocalization.

Key Terms:

  • Resonance

  • Delocalization

  • Formal charge

Step-by-Step Guidance

  1. Draw the initial structure of the cation.

  2. Identify possible electron movements (pi electrons, lone pairs) that can create alternative resonance forms.

  3. Draw each resonance structure, showing the movement of electrons with arrows.

  4. Check that all resonance structures have the correct formal charges, but stop before finalizing all forms.

Try solving on your own before revealing the answer!

Q13. Write a DETAILED mechanism (showing each step) for the following reaction. Be sure to include lone pairs, charges and the flow of electrons where needed.

Background

Topic: Reaction Mechanisms

This question tests your ability to write detailed stepwise mechanisms, including electron flow, charges, and lone pairs.

Key Terms:

  • Reaction mechanism

  • Curved arrow notation

  • Lone pairs

  • Formal charge

Step-by-Step Guidance

  1. Draw the starting material and identify the reactive sites.

  2. Show the movement of electrons using curved arrows for each step.

  3. Indicate any intermediates formed, including charges and lone pairs.

  4. Continue the mechanism stepwise, but stop before the final product.

Try solving on your own before revealing the answer!

Q14. In a Diels-Alder reaction, which of these compounds would react faster as the diene? Explain your answer.

Background

Topic: Diels-Alder Reaction

This question tests your understanding of factors affecting diene reactivity in Diels-Alder reactions, such as electron-donating groups and s-cis conformation.

Key Terms:

  • Diels-Alder reaction

  • Diene reactivity

  • Electron-donating groups

  • s-cis conformation

Step-by-Step Guidance

  1. Identify the structural features of each diene (substituents, conformation).

  2. Recall that electron-donating groups increase diene reactivity.

  3. Consider the ability of the diene to adopt the s-cis conformation.

  4. Compare the dienes based on these factors, but stop before stating which reacts faster.

Try solving on your own before revealing the answer!

Q15. Show how you would synthesize the following compound utilizing a Diels-Alder reaction.

Background

Topic: Diels-Alder Synthesis

This question tests your ability to design a synthetic route using the Diels-Alder reaction, including selection of appropriate diene and dienophile.

Key Terms:

  • Diels-Alder reaction

  • Diene

  • Dienophile

  • Stereochemistry

Step-by-Step Guidance

  1. Identify the target compound and its structural features.

  2. Determine the diene and dienophile needed to construct the target molecule.

  3. Outline the reaction conditions and mechanism for the Diels-Alder reaction.

  4. Draw the reaction sequence, but stop before the final product.

Try solving on your own before revealing the answer!

Q16. Predict the product of the following reaction showing stereochemistry (if needed).

Background

Topic: Diels-Alder Reaction Product Prediction

This question tests your ability to predict the stereochemistry and structure of the product formed in a Diels-Alder reaction.

Key Terms:

  • Diels-Alder reaction

  • Stereochemistry

  • Endo/exo product

Step-by-Step Guidance

  1. Identify the diene and dienophile in the reaction.

  2. Draw the possible product(s) considering the stereochemistry (endo/exo).

  3. Use the Diels-Alder mechanism to predict the product, but stop before drawing the final structure.

Try solving on your own before revealing the answer!

Q17. Determine whether the following species are aromatic, nonaromatic or antiaromatic.

Background

Topic: Aromaticity

This question tests your ability to apply the rules of aromaticity (Hückel's rule, planarity, conjugation) to classify compounds.

Key Terms:

  • Aromatic

  • Nonaromatic

  • Antiaromatic

  • Hückel's rule

Step-by-Step Guidance

  1. Draw the structure of each species.

  2. Check for planarity and conjugation in the ring system.

  3. Count the number of pi electrons and apply Hückel's rule ($4n+2$ for aromatic, $4n$ for antiaromatic).

  4. Classify each species, but stop before stating which category applies.

Try solving on your own before revealing the answer!

Q18. Place electrons on the N atoms to indicate whether or not they are part of the aromatic system.

Background

Topic: Aromaticity and Electron Placement

This question tests your understanding of how lone pairs and electrons on heteroatoms (like nitrogen) contribute to aromaticity.

Key Terms:

  • Lone pairs

  • Aromatic system

  • Electron delocalization

Step-by-Step Guidance

  1. Draw the structure and locate the nitrogen atoms.

  2. Determine if the lone pairs on nitrogen are involved in the aromatic pi system or not.

  3. Place electrons accordingly, but stop before finalizing the electron placement.

Try solving on your own before revealing the answer!

Q19. Which of the following ions is more stable? Justify your answer.

Background

Topic: Stability of Ions

This question tests your ability to compare the stability of ions based on resonance, aromaticity, and charge delocalization.

Key Terms:

  • Resonance stabilization

  • Aromaticity

  • Charge delocalization

Step-by-Step Guidance

  1. Draw the structures of the ions.

  2. Analyze possible resonance forms and delocalization of charge.

  3. Consider aromaticity and other stabilizing factors.

  4. Compare the ions, but stop before stating which is more stable.

Try solving on your own before revealing the answer!

Q20. Determine which compound would be more basic. Justify your answer or you will not receive any points.

Background

Topic: Basicity of Organic Compounds

This question tests your ability to compare basicity based on structure, electron availability, and resonance effects.

Key Terms:

  • Basicity

  • Electron availability

  • Resonance

  • Inductive effects

Step-by-Step Guidance

  1. Draw the structures of the compounds.

  2. Identify the atom responsible for basicity (usually nitrogen or oxygen).

  3. Analyze resonance and inductive effects that affect electron availability.

  4. Compare the compounds, but stop before stating which is more basic.

Try solving on your own before revealing the answer!

Q21. Name the following compounds.

Background

Topic: Nomenclature of Aromatic and Alcohol Compounds

This question tests your ability to apply IUPAC rules to name aromatic compounds and alcohols.

Key Terms:

  • IUPAC nomenclature

  • Aromatic compounds

  • Alcohols

Step-by-Step Guidance

  1. Identify the parent structure (benzene, phenyl, etc.).

  2. Locate and name the substituents according to IUPAC rules.

  3. Assign numbers to the ring or chain to give the lowest possible numbers to substituents.

  4. Write the name, but stop before finalizing it.

Try solving on your own before revealing the answer!

Q22. Draw a condensed structural formula for the following compounds:

  • 4-nitroaniline

  • 2-phenylpropan-1-ol

Background

Topic: Drawing Condensed Structural Formulas

This question tests your ability to interpret IUPAC names and draw condensed structural formulas for aromatic and alcohol compounds.

Key Terms:

  • Condensed structural formula

  • Aromatic ring

  • Alcohol functional group

Step-by-Step Guidance

  1. Break down the IUPAC name to identify the parent structure and substituents.

  2. Draw the aromatic ring and place substituents at the correct positions.

  3. Write the condensed structural formula, but stop before finalizing it.

Try solving on your own before revealing the answer!

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