Q: Which of the following IR absorption ranges is characteristic of primary and secondary amines?

$$3200\ \text{cm}^{-1} to$$ $$3500\ \text{cm}^{-1}$$

Question 1

Which of the following statements best explains why tertiary amines have lower boiling points than primary and secondary amines of similar molecular weight?

Accepted Answer

Tertiary amines cannot form hydrogen bonds with each other because they lack N–H bonds.

Question 2

Which of the following compounds is expected to be the most basic in aqueous solution?

Accepted Answer

Methylamine ($$CH_3NH_2)$$

Question 3

A student wants to synthesize a primary amine from an alkyl halide without forming secondary or tertiary amines. Which method should they use?

Accepted Answer

Gabriel Synthesis

Question 4

Which of the following best describes the product of the Hofmann elimination reaction?

Accepted Answer

The less substituted alkene (Hofmann product) is the major product.

Question 5

Which of the following IR absorption ranges is characteristic of primary and secondary amines?

Accepted Answer

$$3200\ 	ext{cm}^{-1} to$$ $$3500\ 	ext{cm}^{-1}$$

Question 6

Which of the following statements about the basicity of arylamines (such as aniline) is correct?

Accepted Answer

The lone pair on nitrogen is delocalized into the aromatic ring, decreasing its availability for protonation.

Question 7

Which of the following is a common use of amines in the pharmaceutical industry?

Accepted Answer

As local anesthetics such as lidocaine

Question 8

What is the major product when nitrobenzene is reduced using $$\mathrm{H_2$}/\mathrm{Pd}$$?

Accepted Answer

Aniline ($$C_6H_5NH_2)$$

Question 9

Which of the following statements about the solubility of amines in water is correct?

Accepted Answer

Primary and secondary amines are more soluble in water than tertiary amines due to their ability to form hydrogen bonds.

Question 10

Which of the following best describes the nucleophilicity of amines?

Accepted Answer

Amines are good nucleophiles due to the lone pair of electrons on nitrogen.

Question 11

Which of the following reactions is used to synthesize a primary amine from a nitrile?

Accepted Answer

Reduction with $$\mathrm{$$LiAlH_4$$}$$

Question 12

Which of the following is the correct IUPAC name for the compound $$CH_3CH_2CH_2NH_2$$?

Accepted Answer

Propan-1-amine

Question 13

Which of the following statements about the mass spectrometry of amines is correct?

Accepted Answer

A molecule with an odd number of nitrogen atoms has an odd molecular mass.

Question 14

Which of the following is a correct statement about the NMR spectra of amines?

Accepted Answer

Amine protons are exchangeable and may disappear or shift when dissolved in $$D_2O.$$

Question 15

Which of the following best explains why the Hofmann elimination gives the less substituted alkene as the major product?

Accepted Answer

Steric hindrance makes the less substituted hydrogen more accessible for elimination.

Question 16

Which of the following is a correct description of the Gabriel synthesis?

Accepted Answer

It uses phthalimide as a nucleophile to prepare primary amines from alkyl halides.

Question 17

Which of the following is a real-world example of an amine used as a pharmaceutical?

Accepted Answer

Lidocaine

Question 18

Which of the following best describes the effect of electron-donating groups on the basicity of amines?

Accepted Answer

Electron-donating groups increase basicity by donating electron density to nitrogen.

Amines: Structure, Properties, Synthesis, and Reactions

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