Question 1

Which of the following statements correctly describes a key difference between aldehydes and ketones?

Accepted Answer

Aldehydes have a carbonyl group bonded to at least one hydrogen, while ketones have a carbonyl group bonded to two alkyl groups.

Question 2

Which reagent would you use to distinguish between an aldehyde and a ketone in a laboratory setting?

Accepted Answer

Tollens' reagent

Question 3

What is the expected product when an aldehyde is oxidized using potassium dichromate ($\mathrm{K_2Cr_2O_7}$) under acidic conditions?

Accepted Answer

A carboxylic acid

Question 4

Which physical property is generally higher in ketones compared to aldehydes of similar molecular weight?

Accepted Answer

Boiling point

Question 5

Consider the following reaction: $\mathrm{CH_3CHO + 2[Ag(NH_3)_2]^+ + 3OH^- \rightarrow CH_3COO^- + 2Ag + 4NH_3 + 2H_2O}$. What is the role of $\mathrm{CH_3CHO}$ in this reaction?

Accepted Answer

It acts as a reducing agent.

Question 6

Which of the following compounds will NOT react with Tollens' reagent?

Accepted Answer

Acetone ($\mathrm{CH_3COCH_3}$)

Question 7

Which structural feature is responsible for the higher reactivity of aldehydes compared to ketones in nucleophilic addition reactions?

Accepted Answer

Aldehydes have less steric hindrance and a more electrophilic carbonyl carbon.

Question 8

Which of the following is the correct IUPAC name for the compound $\mathrm{CH_3COCH_2CH_3}$?

Accepted Answer

2-Butanone

Question 9

When a ketone reacts with an alcohol under acidic conditions, which type of compound is formed?

Accepted Answer

Hemiketal

Question 10

Which of the following statements about the solubility of aldehydes and ketones in water is correct?

Accepted Answer

Aldehydes and ketones with short carbon chains are soluble in water due to hydrogen bonding with water.

Question 11

Which reaction is used industrially to synthesize acetone ($\mathrm{CH_3COCH_3}$)?

Accepted Answer

Oxidation of isopropanol ($\mathrm{CH_3CHOHCH_3}$)

Question 12

Which of the following is a correct statement about the formation of hemiacetals?

Accepted Answer

Hemiacetals are formed by the reaction of an aldehyde or ketone with one equivalent of alcohol.

Question 13

Which of the following best describes the outcome when a ketone reacts with excess alcohol in the presence of acid?

Accepted Answer

A ketal is formed.

Question 14

Predict the product of the following reaction: $\mathrm{CH_3CHO + CH_3OH \xrightarrow{H^+} ?}$

Accepted Answer

A hemiacetal

Question 15

Which of the following is NOT a derivative of aldehydes and ketones?

Accepted Answer

Ester

Question 16

Which of the following reactions is used to synthesize an acetal from an aldehyde?

Accepted Answer

Reaction of an aldehyde with two equivalents of alcohol in the presence of acid

Question 17

Which of the following statements about the reactivity of ketones and aldehydes with alcohols is correct?

Accepted Answer

Aldehydes react with alcohols to form hemiacetals more readily than ketones.

Question 18

Which of the following is the correct structure for a hemiketal?

Accepted Answer

A carbon atom bonded to one -OH group, one -OR group, and two alkyl groups

Question 19

Which of the following is a correct statement about the reaction of ketones with alcohols?

Accepted Answer

Ketones react with alcohols to form ketals in the presence of acid.

Aldehydes and Ketones: Structure, Properties, and Reactions

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