$$\text{Histamine acetate} + KOH \rightarrow \text{Histamine} + K^+ + C_2H_3O_2^- + H_2O$$

Question 1

Which of the following best describes a tertiary amine?

Accepted Answer

An amine with three organic groups directly bonded to the nitrogen atom ($$R_3N)$$

Question 2

What is the correct IUPAC name for the compound with the structure $$CH_3CH_2NH_2$$?

Accepted Answer

Ethylamine

Question 3

Which of the following statements about the boiling points of amines is correct?

Accepted Answer

Primary and secondary amines have higher boiling points than alkanes of similar size due to hydrogen bonding.

Question 4

Which compound is classified as a heterocyclic amine?

Accepted Answer

Pyrrolidine

Question 5

What is the product when ethylamine reacts with hydrochloric acid?

Accepted Answer

Ethylammonium chloride ($$CH_3CH_2NH_3^+Cl^-)$$

Question 6

Which of the following is true about quaternary ammonium ions?

Accepted Answer

They have four organic groups bonded to nitrogen and carry a permanent positive charge ($$R_4N^+).$$

Question 7

Which of the following reactions demonstrates the basicity of amines in water?

Accepted Answer

$$CH_3CH_2NH_2 + H_2O \rightleftharpoons CH_3CH_2NH_3^+ + OH^-$$

Question 8

Which of the following best explains why aromatic amines are weaker bases than nonaromatic amines?

Accepted Answer

The lone pair on nitrogen in aromatic amines is delocalized into the aromatic ring, reducing its availability to accept protons.

Question 9

Which of the following is a correct balanced equation for the reaction of histamine acetate with potassium hydroxide?

Accepted Answer

$$	ext{Histamine acetate} + KOH ightarrow 	ext{Histamine} + K^+ + C_2H_3O_2^- + H_2O$$

Question 10

Which of the following statements about alkaloids is correct?

Accepted Answer

Alkaloids are naturally occurring, nitrogen-containing compounds isolated from plants, usually basic, bitter, and poisonous.

Question 11

Which of the following amines would be most soluble in water?

Accepted Answer

Methylamine ($$CH_3NH_2)$$

Question 12

Which of the following is the correct name for the compound $$CH_3CH_2CH_2NHCH_2CH_3$$?

Accepted Answer

N-Ethylpropylamine

Question 13

Which property is NOT typical of amine salts compared to neutral amines?

Accepted Answer

Amine salts are more toxic by ingestion than neutral amines.

Question 14

Which of the following is a real-world application of quaternary ammonium salts?

Accepted Answer

They are used as antimicrobial agents in surgical scrubs and sterile storage of instruments.

Question 15

Which of the following best describes the reaction of a primary amine with water?

Accepted Answer

The amine acts as a base, accepting a proton from water to form an ammonium ion and hydroxide ion.

Question 16

Which of the following is the correct classification for N,N-diethylbutylamine?

Accepted Answer

Tertiary amine

Question 17

Which of the following is a correct statement about the regeneration of a free amine from its salt?

Accepted Answer

Treatment with a base such as NaOH will regenerate the free amine from its salt.

Question 18

Which of the following is a correct example of an aromatic amine?

Accepted Answer

Aniline ($$C_6H_5NH_2)$$

Question 19

Which of the following best explains the increased toxicity of solanine in potatoes exposed to sunlight?

Accepted Answer

Sunlight stimulates the formation of chlorophyll and increases solanine production, which is not destroyed during cooking.

Amines: Structure, Properties, and Biological Importance

Study Guide - Practice Questions