An advantage of Friedel-Crafts acylation reactOns is- A. reactions take place wi

Question

An advantage of Friedel-Crafts acylation reactOns is- A. reactions take place without the use of a Lewis acid B. rearrangement reactions tend to occur C multiple acylation reactions do not readily occur D. polyacylbenzenes can be readily prepared 8. 9, Nucleophilic substitution reactions require a benzene ring to have substituents. A no B. strong electron-donating C. strong electron-withdrawing D. strong o/p directing 10. Benzyne is a molecule that has A. all single bonds B. all double bonds C only single and double bonds D. one"triple"bond 11. The amine group (-NH,) in aniline is a/ansubstituent. A activating B. deactivating C meta-directing 12. Benzoic acid can be prepared by oxidizing a/an ring. substituent on a benzene A hydroxyl B. amine C primary alkyl D. tertiary alkyl 13. A Clemmensen reduction reaction A. reduces a ketone to an alcohol B. reduces an acid to an alcohol C oxidizes an alcohol to an acid D. converts a carbonyl group to a methylene CH) group 14. Benzene can be reduced by reaction with _in the presence of a catalyst. A. oxygen B. hydrogen C water D. nitrogen

Explanation / Answer

8. The advantage of Fiedel-Crafts acylation reaction is that after acylation, the benzene ring is deactivated and the possibility of further acylation is not furnished. Hence, the correct option is C.

9. For benzene to undergo nucleophilic substitution reaction the benzene ring should have a strong electron withdrawing group attached. Hence, the correct option is C.

10. In benzyne there is one triple bond and two double bonds. Hence, the correct option is D.

11. Amine (-NH2) is an electron releasing group which means it is an activating group. Hence, the correct option is A.

12. A primary alkyl group attached to a benzene ring when oxidised chenged into carboxylic acid group giving a benzoic acid. Hence, the correct option is C.

13. In clemmensen reduction a carbonyl group is reduced to CH2 group. Hence, the correct option is D.

14. Benzene is reduced by reaction with hydrogen in the presence of a metal catalyst. Hence, the correct option is B.

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