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

SN2 reactions involve backside attack of the nucleophile, resulting in Walden inversion (inversion of configuration) at the reaction center.

Question 2

What distinguishes an aldehyde from a ketone?

Accepted Answer

Aldehydes have at least one hydrogen on the carbonyl carbon

Answer

Aldehydes have the carbonyl group at the end of the carbon chain (–CHO), with at least one H directly bonded to the carbonyl carbon.

Question 3

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

Accepted Answer

s-cis reacts; s-trans does not

Answer

The diene must adopt the s-cis conformation to achieve the proper orbital overlap needed for the [4+2] cycloaddition.

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

The energy difference (~45 kJ/mol) between the chair and boat conformations of cyclohexane is simply the conformational energy difference (no single special term applies).

Question 5

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

Accepted Answer

Acid chlorides

Answer

Acid chlorides are the most reactive acyl derivatives because Cl⁻ is an excellent leaving group and provides less resonance stabilization of the carbonyl.

Chemistry Practice Test Practice Test

Chemistry Practice Test Practice Test

Chemistry Test Organic Chemistry 5