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In: Chemistry

Which of the following statements are true? a. Amides react with methyl alcohol in the presence...

Which of the following statements are true?

a. Amides react with methyl alcohol in the presence of an acid catalyst to form an ester.
b. Amides are hydrolyzed in strong acids or strong bases to form carboxylic acids or carboxylate anions.
c. Amides react with thionyl chloride to form acid chlorides.
d. Amides are too stable to undergo any reactions, with the exception of polymerization.

The IR spectrum of an unknown compound has a sharp, medium intensity peak at 2250 cm-1. The compound belongs to the following class of chemicals?

an alkane
an aldehyde
an amide
a nitrile

What is the first step in the general mechanism for nucleophilic acyl substitution?

Protonation of the carbonyl group
Removal of an alpha proton
Addition of the nucleophile to the carbonyl group
Loss of the leaving group

Compound A (C9H10O) reacts with methylmagnesium bromide, followed by hydrochloric acid in water to form compound B. Compound B (C10H14O) has the following 1H NMR spectrum: delta (ppm): 0.8 (triplet, 3H), 1.5 (singlet, 3H), 1.6-1.8 (multiplet, 2H), 1.9 (singlet, 1H), 7.2 (triplet, 1H), 7.3 (triplet, 2H), 7.4 (doublet, 2H). What is the structure of compound A?

a. 2-methyl-1-phenylpropan-1-one
b. 3-phenylbutan-2-one
c. 2-methyl-2-phenylpropanal
d. propiophenone

Cyclic acetals are used as protecting groups for ketones and aldehydes, because they are inert to all of the following reagents, with the exception of?

a. nucleophiles
b. aqueous bases
c. oxidizing agents
d. aqueous acids
e. reducing agents

Solutions

Expert Solution

Which of the following statements are true?

b. Amides are hydrolyzed in strong acids or strong bases to form carboxylic acids or carboxylate anions

Other mentioned reaction will not under go by aminde.

The IR spectrum of an unknown compound has a sharp, medium intensity peak at 2250 cm-1. The compound belongs to the following class of chemicals?

  a nitrile

Nitrile has sharp peak at 2250 cm-1

What is the first step in the general mechanism for nucleophilic acyl substitution

Addition of the nucleophile to the carbonyl group

Addition of nucleophile followed by leaving group will be left

Compound A (C9H10O) reacts with methylmagnesium bromide, followed by hydrochloric acid in water to form compound B. Compound B (C10H14O) has the following 1H NMR spectrum: delta (ppm): 0.8 (triplet, 3H), 1.5 (singlet, 3H), 1.6-1.8 (multiplet, 2H), 1.9 (singlet, 1H), 7.2 (triplet, 1H), 7.3 (triplet, 2H), 7.4 (doublet, 2H). What is the structure of compound A?

d. propiophenone

Cyclic acetals are used as protecting groups for ketones and aldehydes, because they are inert to all of the following reagents, with the exception of?

d. aqueous acids

Cyclic acetals are readily cleaved under aqueous acids conditions

queen_honey_blossom answered 2 years ago
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