Question 1

Which of the following statements best describes the concept of hybridization in organic molecules?

Accepted Answer

Hybridization refers to the mixing of atomic orbitals to form new orbitals suitable for the pairing of electrons to form chemical bonds.

Question 2

Given the molecule ethene ($$\mathrm{C_2H_4}$$), what is the hybridization of the carbon atoms?

Accepted Answer

$$\mathrm{sp^2$}$$

Question 3

Which of the following molecules contains a chiral center?

Accepted Answer

2-butanol ($$\mathrm{CH_3CH(OH)CH_2CH_3})$$

Question 4

Which of the following best explains why cyclohexane adopts a chair conformation?

Accepted Answer

To minimize torsional and steric strain by allowing all carbon atoms to have staggered bonds.

Question 5

Which of the following is the correct order of acidity for the following compounds: acetic acid ($$\mathrm{CH_3COOH}$$), ethanol ($$\mathrm{CH_3CH_2OH}$$), and phenol ($$\mathrm{C_6H_5OH}$$)?

Accepted Answer

Acetic acid \u003e phenol \u003e ethanol

Question 6

A student is asked to draw the Lewis structure for formaldehyde ($$\mathrm{CH_2O}). $$Which of the following is the correct number of lone pairs on the oxygen atom?

Accepted Answer

2

Question 7

Which of the following statements about resonance structures is TRUE?

Accepted Answer

Resonance structures represent different possible arrangements of electrons, but not atoms, within a molecule.

Question 8

Which of the following best describes the role of nucleophiles in organic reactions?

Accepted Answer

Nucleophiles donate electron pairs to electrophiles to form new covalent bonds.

Question 9

Which of the following is the correct electron configuration for a carbon atom in its ground state?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^2$$

Question 10

Which of the following statements about the VSEPR theory is correct?

Accepted Answer

VSEPR theory predicts the geometry of molecules based on the repulsion between electron pairs around a central atom.

Question 11

A student is asked to predict the major product of the reaction between 2-bromopropane and sodium hydroxide ($$\mathrm{NaOH}) $$under heat. Which mechanism is most likely to occur?

Accepted Answer

E2 elimination

Question 12

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 13

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

$$\mathrm{CH_3CH_2CH_2CH_2OH}$$

Accepted Answer

1-butanol

Question 14

Which of the following statements about aromaticity is TRUE?

Accepted Answer

Aromatic compounds must have a planar ring structure and follow Hückel's rule ($$4n+2$$ $$\pi$$ electrons).

Question 15

Which of the following is the correct pKa order for the following acids: water ($$\mathrm{H_2O}$$), acetic acid ($$\mathrm{CH_3COOH}$$), and hydrochloric acid ($$\mathrm{HCl}$$)?

Accepted Answer

$$\mathrm{HCl} \u003c \mathrm{CH_3COOH} \u003c \mathrm{H_2O}$$

Question 16

Which of the following molecules is expected to have the highest boiling point?

Accepted Answer

1-butanol ($$\mathrm{CH_3CH_2CH_2CH_2OH})$$

Question 17

Which of the following is a correct statement about the mechanism of the SN2 reaction?

Accepted Answer

The SN2 reaction proceeds via a single concerted step where the nucleophile attacks the electrophile as the leaving group departs.

Question 18

Which of the following is the correct Lewis structure for ammonia ($$\mathrm{NH_3$}$$)?

Accepted Answer

Nitrogen with three single bonds to hydrogen and one lone pair.

Question 19

A student is asked to explain why the pKa of phenol ($$\mathrm{C_6H_5OH}) is $$lower than that of ethanol ($$\mathrm{CH_3CH_2OH}). $$Which explanation is correct?

Accepted Answer

The phenoxide ion formed after deprotonation is stabilized by resonance in the aromatic ring.

Organic Chemistry I: Course Syllabus and Study Guide

Guida di studio - Domande di pratica

Study guide - Flashcard