Question 1

Which of the following statements best explains why the C–F bond is more polar than the C–Cl bond?

Accepted Answer

Fluorine is more electronegative than chlorine, resulting in a greater difference in electronegativity between carbon and fluorine.

Question 2

Given the molecule acetic acid ($CH_3COOH$), which atom is most likely to bear a partial negative charge in its most stable resonance structure?

Accepted Answer

The oxygen atom of the hydroxyl group ($OH$)

Question 3

Which of the following best describes the hybridization of the central carbon atom in formaldehyde ($CH_2O$)?

Accepted Answer

$sp^2$

Question 4

A molecule of 2-butanol ($CH_3CH(OH)CH_2CH_3$) is classified as which of the following based on its functional group?

Accepted Answer

Alcohol

Question 5

Which of the following is the correct IUPAC name for the compound with the structure $CH_3CH_2CH_2CHO$?

Accepted Answer

Butanal

Question 6

Which of the following statements about resonance structures is TRUE?

Accepted Answer

The actual molecule is a hybrid of all valid resonance structures, and the resonance hybrid is more stable than any individual structure.

Question 7

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

Accepted Answer

To minimize torsional and steric strain by staggering the bonds and maximizing bond angles.

Question 8

Which of the following is a correct statement about the acidity of $CH_3COOH$ (acetic acid) compared to $CH_3CH_2OH$ (ethanol)?

Accepted Answer

Acetic acid is more acidic because the negative charge on its conjugate base is stabilized by resonance.

Question 9

Which of the following best describes the difference between a sigma ($\sigma$) and a pi ($\pi$) bond?

Accepted Answer

A $\sigma$ bond is formed by head-on overlap of orbitals, while a $\pi$ bond is formed by side-on overlap.

Question 10

Which of the following molecules is chiral?

Accepted Answer

2-bromobutane

Question 11

Which of the following best explains why $sp$-hybridized carbons are more electronegative than $sp^3$-hybridized carbons?

Accepted Answer

The $sp$ orbital has more s-character, bringing electrons closer to the nucleus.

Question 12

Which of the following is the correct order of increasing acidity for the following compounds: $CH_4$, $NH_3$, $H_2O$, $HF$?

Accepted Answer

$CH_4 < NH_3 < H_2O < HF$

Question 13

A student is asked to assign R or S configuration to the chiral center in 2-bromobutane. Which of the following is the correct sequence of priorities for the four groups attached to the chiral carbon?

Accepted Answer

Br > CH_2CH_3 > CH_3 > H

Question 14

Which of the following best describes a meso compound?

Accepted Answer

A compound with multiple chiral centers that is superimposable on its mirror image due to an internal plane of symmetry.

Question 15

Which of the following is the major resonance contributor for the acetate ion ($CH_3COO^-$)?

Accepted Answer

The structure in which the negative charge is delocalized equally between both oxygen atoms.

Question 16

Which of the following best explains why tert-butyl chloride reacts faster than methyl chloride in an $S_N1$ reaction?

Accepted Answer

The carbocation formed from tert-butyl chloride is more stabilized by hyperconjugation and inductive effects.

Question 17

Which of the following best describes the effect of an electron-withdrawing group on the acidity of a carboxylic acid?

Accepted Answer

It increases the acidity by stabilizing the negative charge on the conjugate base.

Question 18

Which of the following best describes the difference between enantiomers and diastereomers?

Accepted Answer

Enantiomers are non-superimposable mirror images, while diastereomers are not mirror images.

Question 19

Which of the following is the best description of a Lewis acid?

Accepted Answer

A species that can accept a pair of electrons.

Question 20

Which of the following best explains why the axial position in cyclohexane is less favorable for large substituents than the equatorial position?

Accepted Answer

Axial substituents experience 1,3-diaxial interactions, leading to increased steric strain.

Organic Chemistry I: Core Concepts, Bonding, Structure, and Reactivity

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