Question 1

Which of the following statements best explains why alcohols are generally more water-soluble than ethers of similar molecular weight?

Accepted Answer

Alcohols can form hydrogen bonds with water, while ethers cannot.

Question 2

A primary alcohol is oxidized using potassium dichromate ($$K_2Cr_2O_7) in $$acidic solution. What is the final product of this reaction?

Accepted Answer

A carboxylic acid

Question 3

Which of the following functional groups contains a carbon atom double-bonded to an oxygen atom and single-bonded to a hydrogen atom?

Accepted Answer

Aldehyde

Question 4

Which test would you use to distinguish between an aldehyde and a ketone, and what is the expected result for an aldehyde?

Accepted Answer

Tollens' test; aldehyde produces a silver mirror

Question 5

Which of the following statements about the oxidation of secondary alcohols is correct?

Accepted Answer

Secondary alcohols are oxidized to ketones.

Question 6

Phenol is more acidic than cyclohexanol because:

Accepted Answer

The aromatic ring in phenol stabilizes the negative charge on the conjugate base.

Question 7

Which of the following best describes the difference between an alcohol and an ether?

Accepted Answer

Alcohols have an $$-OH$$ group bonded to a carbon, while ethers have an oxygen atom bonded to two carbons.

Question 8

A breathalyzer test detects ethanol by oxidizing it to acetic acid. Which color change indicates the presence of ethanol?

Accepted Answer

Green color appears due to the reduction of $$Cr_2O_7$$^{2-}$$ to Cr$$^{3+}$$

Question 9

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

Accepted Answer

Ketones cannot be oxidized under normal conditions.

Question 10

Which of the following is a correct statement about the intermolecular forces in alcohols and ethers?

Accepted Answer

Alcohols have stronger intermolecular forces than ethers due to hydrogen bonding.

Question 11

Which of the following reactions is an example of a condensation reaction?

Accepted Answer

$$X-OH + H-Y \rightarrow X-Y + H_2O$$

Question 12

Which of the following best describes the product formed when an alcohol adds to an aldehyde?

Accepted Answer

A hemiacetal

Question 13

What is the oxidation state of carbon in carbon dioxide ($$CO_2$$)?

Accepted Answer

$$+4$$

Question 14

Which of the following statements about the Benedict's test is correct?

Accepted Answer

It selectively oxidizes alpha-hydroxy aldehydes and ketones, producing a red-brown precipitate.

Question 15

Which of the following is true regarding the formation of cyclic hemiacetals in glucose?

Accepted Answer

The straight-chain aldehyde form of glucose reacts intramolecularly to form a cyclic hemiacetal.

Question 16

Which of the following best explains why the carbon-oxygen bond in phenols is more polarized than in alcohols?

Accepted Answer

The aromatic ring in phenols withdraws electron density, increasing bond polarization.

Question 17

Which of the following is a correct statement about the oxidation of tertiary alcohols?

Accepted Answer

Tertiary alcohols do not undergo oxidation under normal conditions.

Question 18

Which of the following best describes the difference between an aldehyde and a ketone?

Accepted Answer

Aldehydes have the carbonyl group at the end of the carbon chain, while ketones have it in the middle.

Question 19

Which of the following statements about the hydrolysis of acetals is correct?

Accepted Answer

Hydrolysis of acetals breaks them into an aldehyde or ketone and two alcohols.

Alcohols, Ethers, Phenols, Aldehydes, and Ketones: Structure, Properties, and Reactions

Guida di studio - Domande di pratica