Question 1

Which statement best explains why aldehydes generally have higher boiling points than alkanes of similar molecular weight?

Accepted Answer

Aldehydes have a polar $$\mathrm{C=O}$$ group, leading to stronger dipole-dipole interactions than alkanes.

Question 2

What is the correct IUPAC name for the following structure: $$\mathrm{CH_3CH_2CH_2CH_2CHO}$$?

Accepted Answer

Pentanal

Question 3

Which reagent is commonly used for the mild oxidation of primary alcohols to aldehydes?

Accepted Answer

Pyridinium chlorochromate (PCC)

Question 4

Which of the following compounds will give a positive Tollens' test?

Accepted Answer

Benzaldehyde

Question 5

During the hydration of aldehydes and ketones, what is the relationship between the number of alkyl groups attached to the carbonyl carbon and the amount of hydrate formed at equilibrium?

Accepted Answer

Fewer alkyl groups lead to more hydrate formation.

Question 6

Which of the following is the product when an aldehyde reacts with two equivalents of an alcohol under acidic conditions?

Accepted Answer

An acetal

Question 7

What is the major product when pentanal is treated with excess hydrazine ($$\mathrm{H_2NNH_2}) $$and potassium hydroxide ($$\mathrm{KOH}$$)?

Accepted Answer

Pentane

Question 8

Which statement correctly describes the outcome of the Cannizzaro reaction?

Accepted Answer

An aldehyde is converted to a carboxylic acid and a salt of carboxylic acid.

Question 9

Which of the following best explains why ketones are generally inert towards oxidation under mild conditions?

Accepted Answer

Ketones lack a hydrogen atom on the carbonyl carbon.

Question 10

Which compound is formed when acetone reacts with hydrogen cyanide ($$\mathrm{HCN}$$)?

Accepted Answer

A cyanohydrin

Question 11

A student wants to prepare pentanal from 1-pentanol. Which type of reaction should they use?

Accepted Answer

Oxidation

Question 12

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

Accepted Answer

2-Butanone

Question 13

Which physical property is shared by both aldehydes and ketones due to the presence of the carbonyl group?

Accepted Answer

Polarity due to the $$\mathrm{C=O}$$ bond

Question 14

Which of the following reactions is responsible for the formation of cyclic structures in monosaccharides such as glucose?

Accepted Answer

Intramolecular cyclization forming a hemiacetal

Question 15

Which of the following statements about the nomenclature of aldehydes is correct?

Accepted Answer

The parent chain must contain the $$\mathrm{-CHO}$$ group, which is always numbered as C1.

Question 16

Which of the following is a correct example of a ketone used in everyday life?

Accepted Answer

Acetone as a nail polish remover solvent

Question 17

What is the product when a primary amine reacts with an aldehyde?

Accepted Answer

An imine ($$\mathrm{R_2C=NR})$$

Question 18

Which of the following statements about the addition of alcohols to ketones is correct?

Accepted Answer

Addition of one equivalent of alcohol to a ketone forms a hemiketal.

Question 19

Which of the following is true regarding the precedence of functional groups in IUPAC nomenclature when both a carbonyl and a hydroxy group are present?

Accepted Answer

The carbonyl group takes precedence over the hydroxy group in numbering the parent chain.

Aldehydes & Ketones: Structure, Nomenclature, Properties, Preparation, and Reactions

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