Which of the following is rate determining step in electrophilic substitution re

Question

Which of the following is rate determining step in electrophilic substitution reaction? a) Generation of electrophile b) Attack by an electrophilic reagent on benzene ring c) Formation of product d) All of the mentioned 2. Which of the following act as a catalysis in the nitration of benzene? a) Conc. HCI b) Dil. HCI c) Conc. H2SO4 d) Dil. H2SO4 3. Fuming sulphuric acid is the solution of a) 10 b) 9 c) 8 d) 7 % S03 in conc. H2SO4. 4. Which of the following is the necessary condition for desulphonation? a) Remove volatile hydrocarbon by steam distillation b) Low concentration of water c) High concentration of sulphonating agent d) A large excess of fuming sulphuric acid 5. Which of the following act as electrophile in halogenation? a) Nitronium ion b) Sulphonium ion c) Halonium ion d) Acylium ion 6. Aromatic bromination catalyzed by the Lewis acid thalium acetate gives a) Para isomer b) Ortho isomer c) Meta isomer d) Para and ortho isomer

Explanation / Answer

1. b) Attack by an electrophilic reagents on benzene ring

2. a) Conc HCl

3. d) 7

4. b) Low concentration of water

5. c) Halonium ion

6. d) para and ortho isomer

7. d) Friedel-Crafts Alkylation

8. b) Isopropylbenzene

9. c) Arylketone

10. d) Friedel-Crafts Acylation followed by Clemmensen reduction

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