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1. Which of the following species is attacked by benzene in theelectrophilic nitration reaction? (a)HNO₃(b)NO₂^- (c)NO₂⁺ (d)NO⁺
2. Which of the following is the strongest activating group inelectrophilic aromatic substitution reactions? (a)CH₂CH₃ (b) OCH₃(c)CO₂CH₃ (d) NO₂
3. In electrophilic aromatic substitution reactions a brominesubstituent is (a) a deactivator and a m-director (b) a deactivatorand an o,p-director (c) an activator and a m-director (d) anactivator and an o,p-director

4. List at least two of the limitations associated with theFriedel-Crafts alkylation reaction

5. Which of the following compounds would most likely be used inthe preparation of tertiarybutylbenzene? (a)(CH3)₂CHCOCl (b) (CH₃)₃CCOCl(c)CH₃CH₃CH₃COCl (d)CH₃CH₃COCl

6. Which of the following compounds is least reactive in thenucleophilic aromatic substitution reactions with NaOH?(a)2,4-dinitrochlorobenzene (b)m-nitrochlorobenzene(c)o-nitrochlorobenzene (d)3,5-dinitrochlorobenzene

7. Which mechanism of nucleophilic aromatic substitutionreaction proceeds via a benzyne intermediate? (a)addition-elimination mechanism (b)elimination-additionmechanism

8. Which mechanism of nucleophilic aromatic substitutionreaction proceeds via a negatively charged Meisenheimer complex?(a) addition-elimination mechanism (b)elimination-additionmechanism