Chemistry Test Organic Chemistry 5

Question 1

Which of the following statements about SN2 reactions is correct?

Accepted Answer

They proceed with inversion of configuration

Answer

They proceed with retention of configuration

Answer

They are favored by tertiary substrates

Answer

They form a racemic mixture

Question 2

What distinguishes an aldehyde from a ketone?

Accepted Answer

Aldehydes have at least one hydrogen on the carbonyl carbon

Answer

Aldehydes have two alkyl groups on the carbonyl carbon

Answer

Ketones always have more carbon atoms

Answer

Ketones contain an –OH group

Question 3

In Diels-Alder reactions, which diene geometry reacts and which does not?

Accepted Answer

s-cis reacts; s-trans does not

Answer

s-trans reacts; s-cis does not

Answer

Both s-cis and s-trans react equally

Answer

Neither conformation reacts without a catalyst

Question 4

What is the term for the energy difference between the most stable chair conformation and the boat conformation of cyclohexane?

Accepted Answer

Conformational energy difference

Answer

Ring strain

Answer

Torsional strain

Answer

Steric strain

Question 5

Which type of organic compound is most reactive toward nucleophilic acyl substitution?

Accepted Answer

Acid chlorides

Answer

Carboxylic acids

Answer

Esters

Answer

Amides

Question 6

What does the term 'enantiotopic' describe in organic chemistry?

Accepted Answer

Two groups whose replacement gives enantiomers

Answer

Two groups whose replacement gives identical compounds

Answer

Two groups whose replacement gives diastereomers

Answer

Two groups that are mirror images within the same molecule

Question 7

Which of the following is the correct product of an aldol condensation reaction?

Accepted Answer

An α,β-unsaturated carbonyl compound (after dehydration)

Answer

A β-hydroxy carbonyl compound only

Answer

A carboxylic acid

Answer

A diol