Q: Which of the following is the correct order of acidity for the following compounds: acetic acid, ethanol, and phenol?

$$\text{acetic acid} \u003e \text{phenol} \u003e \text{ethanol}$$

Question 1

Which of the following statements best describes the difference between nucleophiles and electrophiles in organic reactions?

Accepted Answer

Nucleophiles are electron-rich species that donate electrons, while electrophiles are electron-deficient species that accept electrons.

Question 2

Which of the following molecules would be expected to have the highest boiling point due to intermolecular forces?

Accepted Answer

CH$$_3CH$_2OH$$

Question 3

A student is asked to draw all possible resonance structures for the acetate ion, CH$$_3$$COO$$^-. $$Which of the following is true about the resonance structures?

Accepted Answer

The negative charge is delocalized over both oxygen atoms.

Question 4

Which of the following best explains why tertiary carbocations are more stable than primary carbocations?

Accepted Answer

Tertiary carbocations are stabilized by hyperconjugation and inductive effects from three alkyl groups.

Question 5

Which of the following is the correct order of acidity for the following compounds: acetic acid, ethanol, and phenol?

Accepted Answer

$$	ext{acetic acid} \u003e 	ext{phenol} \u003e 	ext{ethanol}$$

Question 6

A reaction proceeds via the following mechanism: the nucleophile attacks the electrophilic carbon, forming a new bond while the leaving group departs in a single concerted step. Which type of reaction mechanism is described?

Accepted Answer

$$\mathrm{S_N2}$$

Question 7

Which of the following statements about resonance structures is correct?

Accepted Answer

The actual molecule is a hybrid of all valid resonance structures, and not any single structure.

Question 8

Which of the following best describes the energy profile of a reaction with a high activation energy and a large negative $$\Delta G$$?

Accepted Answer

The reaction is thermodynamically favorable but kinetically slow.

Question 9

Which of the following is a correct statement about the relationship between molecular structure and acidity?

Accepted Answer

The more stable the conjugate base, the stronger the acid.

Question 10

A student is asked to predict the major product of the reaction between 2-bromopropane and sodium hydroxide in ethanol. Which mechanism and product are most likely?

Accepted Answer

E2 elimination, yielding propene ($$\mathrm{CH_2$=$$CHCH_3$$})$$

Question 11

Which of the following best explains why cis-2-butene has a lower melting point than trans-2-butene?

Accepted Answer

Cis-2-butene has a less symmetrical structure, leading to less efficient packing in the solid state.

Question 12

Which of the following is the correct IUPAC name for the compound shown below?

$$\mathrm{CH_3CH_2CH(CH_3$)CH_2CH_3}$$

Accepted Answer

3-methylpentane

Question 13

Which of the following statements about stereoisomers is correct?

Accepted Answer

Enantiomers are non-superimposable mirror images of each other.

Question 14

Which of the following best describes the role of a catalyst in a chemical reaction?

Accepted Answer

A catalyst lowers the activation energy ($$E_a) of a $$reaction without affecting the overall $$\Delta G.$$

Question 15

Which of the following is the best explanation for why SN2 reactions are faster in polar aprotic solvents than in polar protic solvents?

Accepted Answer

Polar aprotic solvents do not solvate the nucleophile as strongly, making it more reactive.

Question 16

A reaction has the following energy profile: the reactants are at a higher energy than the products, and there is a single transition state. Which of the following statements is true?

Accepted Answer

The reaction is exergonic and likely proceeds in a single step.

Question 17

Which of the following is the correct Lewis structure for the nitrate ion ($$\mathrm{NO_3$^-}$$)?

Accepted Answer

Three resonance structures with one double bond and two single bonds, with the negative charge delocalized over the three oxygens.

Question 18

Which of the following best describes the relationship between the rate constant $$k$$ and the activation energy $$E_a in $$the Arrhenius equation?

Accepted Answer

$$k$$ increases as $$E_a$$ decreases, according to $$k = Ae$$^{-E_a/RT}$$

Question 19

A patient is given a medication that is a chiral molecule. Why is it important for the pharmaceutical company to test both enantiomers of the drug?

Accepted Answer

Enantiomers can have different biological activities in the body.

Question 20

Which of the following is the best explanation for why the hydroxide ion ($$\mathrm{OH^-}) is a $$stronger base than water ($$\mathrm{H_2O}$$)?

Accepted Answer

The hydroxide ion has a negative charge, making it more willing to accept a proton.

Organic Chemistry 221G: Structure, Dynamics, and Course Overview

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