Question 1

Which statement best describes the hybridization and geometry of the carbonyl carbon in aldehydes and ketones?

Accepted Answer

The carbonyl carbon is sp$$^2$$ hybridized and trigonal planar.

Question 2

Why are aldehydes generally more reactive toward nucleophilic addition than ketones?

Accepted Answer

Aldehydes have fewer electron-donating groups, making the carbonyl carbon more electrophilic.

Question 3

Which of the following best explains why nucleophilic attack on a carbonyl group can occur from either the top or bottom face?

Accepted Answer

The carbonyl group is planar, allowing equal access from both sides.

Question 4

What is the product when acetone reacts with water in the presence of acid or base?

Accepted Answer

A geminal diol (acetone hydrate)

Question 5

Which of the following is true about the base-catalyzed hydration of a carbonyl compound?

Accepted Answer

The nucleophile is the hydroxide ion (OH$$^-).$$

Question 6

In the acid-catalyzed addition of water to a carbonyl group, what is the first mechanistic step?

Accepted Answer

Protonation of the carbonyl oxygen

Question 7

Which of the following statements about Grignard reagents is correct?

Accepted Answer

They react with aldehydes, ketones, and carboxylic acid derivatives to form alcohols.

Question 8

What is the product of the reaction between propanal and methylmagnesium bromide followed by hydrolysis?

Accepted Answer

2-butanol

Question 9

Which of the following best describes the Cannizzaro reaction?

Accepted Answer

A base-catalyzed reaction where a non-enolizable aldehyde undergoes disproportionation to yield an alcohol and a carboxylic acid.

Question 10

Which of the following is a correct statement about the reduction of carbonyl compounds with NaBH$$_4$$?

Accepted Answer

Aldehydes are reduced to primary alcohols and ketones to secondary alcohols.

Question 11

Which of the following best explains why nucleophilic addition to a carbonyl group is often reversible when the nucleophile is a weak base?

Accepted Answer

The weak base can be eliminated, regenerating the carbonyl compound.

Question 12

Which product is formed when 2-pentanone reacts with ethylmagnesium bromide followed by hydrolysis?

Accepted Answer

3-methyl-3-hexanol

Question 13

What is the significance of the carbonyl carbon being prochiral?

Accepted Answer

It can become chiral after nucleophilic addition, leading to enantiomers.

Question 14

Which of the following statements about aldol condensation is correct?

Accepted Answer

It involves the reaction of two aldehydes or ketones to form a β-hydroxy carbonyl compound.

Question 15

Which of the following is the correct order of reactivity toward nucleophilic addition for the following carbonyl compounds: formaldehyde, acetone, propanal?

Accepted Answer

Formaldehyde \u003e propanal \u003e acetone

Question 16

In the mechanism of Grignard addition to a carbonyl, what is the role of the Mg$$^{2+}$$ ion?

Accepted Answer

It forms an acid-base complex with the carbonyl oxygen, increasing electrophilicity.

Question 17

Which of the following best describes the product of the acid-catalyzed hydration of acetone?

Accepted Answer

A geminal diol (acetone hydrate)

Question 18

Which of the following is a key difference between the base-catalyzed and acid-catalyzed hydration of carbonyl compounds?

Accepted Answer

Acid-catalyzed hydration involves protonation of the carbonyl oxygen first.

Chemistry of the Carbonyl Group: Structure, Reactivity, and Key Reactions

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