Chem 336 - Spring 1999 - Organic Chemistry III
Portland State University - Dr. Carl C. Wamser

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Chapter 20 Pre-Quiz Answers

(1 point each)

1. Electrophilic aromatic substitution reactions usually need a catalyst such as a

a) base

b) nucleophile

c) Lewis acid

d) H-bonding solvent

2. Electrophilic aromatic substitution involves a cationic intermediate in which positive charge is delocalized by resonance to which positions?

a) ortho

b) meta

c) para

d) all

e) ortho & para

3. Which of the following substituents is a deactivating ortho,para-director?

a) CH3

b) OCH3

c) Cl

d) NO2

e) NH2

4. Using the benzyne mechanism for substitution of m-chlorotoluene by NaNH2, the possible products are

a) o-methylaniline

b) m-methylaniline

c) p-methylaniline

d) all of the above

5. The compound below that would react fastest in a nucleophilic aromatic substitution reaction is

a) p-nitrobromobenzene

b) m-nitrobromobenzene

c) 2,4-dinitrobromobenzene

d) 3,4-dinitrobromobenzene