Question 1

Which of the following best describes the geometry and bond angles around the carbon atom in a carbonyl group?

Accepted Answer

Trigonal planar geometry with 120° bond angles

Question 2

Which of the following compounds is classified as a ketone?

Accepted Answer

CH3COCH3

Question 3

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

Accepted Answer

2-Butanone

Question 4

Which of the following statements about the physical properties of aldehydes and ketones is TRUE?

Accepted Answer

They have higher boiling points than alkanes but lower than alcohols of similar molecular weight.

Question 5

Which of the following best explains why formaldehyde is toxic to living organisms?

Accepted Answer

It reacts with proteins to form crosslinked polymers, disrupting biological function.

Question 6

What is the product when an aldehyde is oxidized in the presence of an oxidizing agent?

Accepted Answer

A carboxylic acid

Question 7

Which of the following tests is used to detect the presence of an aldehyde group in glucose?

Accepted Answer

Tollens' test

Question 8

Which of the following statements about the oxidation of ketones is correct?

Accepted Answer

Ketones do not undergo oxidation under mild conditions.

Question 9

What is the product of the reduction of a ketone using a reducing agent?

Accepted Answer

A secondary alcohol

Question 10

Which of the following best describes a hemiacetal?

Accepted Answer

A compound with both an -OH and an -OR group bonded to the same carbon

Question 11

Which of the following is a correct statement about the formation of acetals from aldehydes or ketones?

Accepted Answer

Acetals are formed by the reaction of an aldehyde or ketone with two equivalents of alcohol in the presence of acid catalyst.

Question 12

Which of the following best explains why simple ketones like acetone are commonly used as solvents?

Accepted Answer

They are moderately polar, have low toxicity, and dissolve a wide range of substances.

Question 13

Which of the following is the correct product of the reaction between acetaldehyde ($$\mathrm{CH_3CHO}) $$and ethanol ($$\mathrm{CH_3CH_2OH}) $$under acidic conditions?

Accepted Answer

$$\mathrm{CH_3CH(OCH_2CH_3)_2} (an $$acetal)

Question 14

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

Accepted Answer

Aldehydes and ketones with small alkyl groups are more soluble in water than those with large alkyl groups.

Question 15

Which of the following best describes the result of a positive Benedict’s test?

Accepted Answer

A blue solution turns red, indicating the presence of an aldehyde group.

Question 16

Which of the following is a correct statement about the hydrolysis of acetals?

Accepted Answer

Acetals are hydrolyzed to aldehydes or ketones and alcohols in the presence of water and acid.

Question 17

Which of the following best explains why glucose can form a cyclic hemiacetal?

Accepted Answer

Glucose contains both an aldehyde group and a hydroxyl group on the same molecule, allowing intramolecular hemiacetal formation.

Question 18

Which of the following is the correct product of the reduction of formaldehyde ($$\mathrm{HCHO}$$)?

Accepted Answer

Methanol ($$\mathrm{CH_3OH})$$

Question 19

Which of the following is a distinguishing feature of an acetal compared to a hemiacetal?

Accepted Answer

An acetal has two -OR groups bonded to the same carbon, while a hemiacetal has one -OH and one -OR group bonded to the same carbon.

Question 20

Which of the following best describes the role of glucose oxidase in Diastix dip sticks for diabetes testing?

Accepted Answer

It oxidizes the aldehyde group of glucose to a carboxylic acid, producing an acid that changes the color of an indicator.

Aldehydes and Ketones: Structure, Properties, and Reactions

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