20. Which of the following is a conjugated diene (A) 2-methylcyclohexanone (D) c

Question

20. Which of the following is a conjugated diene (A) 2-methylcyclohexanone (D) cyclohexa-1,4-diene (B) cyclohexa-1,3-diene (E) cycloocta-1,5-diene (C) 1-methylcyclohexa-1,4-diene 21·The aromatic compound is: 22. Which of the following reaction involves a benzyne mechanism ? (A) Ph-CH3 Ph-COOH (B) Ph-Br Ph-NH2 (C) Ph-OH Ph-Cl (D) Ph-CH3 Ph-CH2Br (E) none of these 23-The benzene has bonds (A)1 (B) 2 (C)3 (D) 4 (E) 6 24. The reagent used for allylic bromination is: (A) Bro/ FeBry (B) Bry/ Fe (C) Br/ AlBr (D)NBS (E) Br2/ HBr 25. The major product in the reaction of benzene with 1-chloropropane, in the presence of AICI3 catalyst is: (A) iso-propylbenzene (D) o-chloro-n-propylbenzene (B) n-propylbenzene(C) chlorobenzene (E) p-chloro-n-propylbenzene

Explanation / Answer

20.

(B) Cyclohexa-1,3-diene

21.

(a)

As per 4n+2 pi electrons rule it has 2 pi electrons and hence is aromatic.

22.

(B)

23. Benzene has

(c) 3 pi bonds

24.

(D) NBS

N-Bromosuccinamide

25.

(A) Isopropylbenzene

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