Chemistry Test Organic Chemistry 2

Question 1

Which reagent is used to convert a primary alcohol to an aldehyde without over-oxidizing to a carboxylic acid?

Accepted Answer

PCC (pyridinium chlorochromate)

Answer

KMnO₄

Answer

H₂CrO₄

Answer

LiAlH₄

Question 2

What type of isomers have the same molecular formula and connectivity but differ in the spatial arrangement of atoms that are NOT interconvertible by rotation around single bonds?

Accepted Answer

Configurational stereoisomers

Answer

Constitutional isomers

Answer

Conformational isomers

Answer

Tautomers

Question 3

In an E2 elimination reaction, the leaving group and the beta-hydrogen must be in what relationship?

Accepted Answer

Anti-periplanar

Answer

Gauche

Answer

Eclipsed

Answer

Syn-periplanar

Question 4

Which of the following correctly describes a nucleophile?

Accepted Answer

An electron-pair donor that attacks electrophiles

Answer

An electron-pair acceptor

Answer

A species that attacks electron-rich sites

Answer

A Lewis acid

Question 5

What product forms when an ester reacts with excess Grignard reagent followed by aqueous workup?

Accepted Answer

A tertiary alcohol

Answer

A primary alcohol

Answer

A secondary alcohol

Answer

A carboxylic acid

Question 6

Which spectroscopic technique is most useful for distinguishing between cis and trans isomers of alkenes based on coupling constants?

Accepted Answer

¹H NMR spectroscopy

Answer

IR spectroscopy

Answer

Mass spectrometry

Answer

UV-Vis spectroscopy

Question 7

What is the IUPAC name of the compound CH₃CH₂C(=O)CH₃?

Accepted Answer

2-butanone

Answer

Butanal

Answer

3-butanone

Answer

Methyl propanoate