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Discussion Forum



1)

The correct statement (s) about the following reaction sequence is (are)  

 $ Cumene (C_{6}H_{12})$ $\xrightarrow[{(i)O_{2}}]{(ii)H_{2}O}$ P   $\underrightarrow {CHCl_{3}/NaOH}$Q(major) +R (minor),

Q$\xrightarrow[\text{NaOH}]{{PhCH_{2}Br}}$S


A) R is stream volatile

B) Q gives dark violet colouration with 1% aqueous $FeCl_{3}$ solution

C) S gives yellow precipitate with 2,4-dinitrophenylhydrazine

D) S gives dark violet colouration with 1% aqueous $FeCl_{3}$ solution.

Answer:

Option B,C

Explanation:

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(a) R is not steam volatile , but Q is steam volatile thus, incorrect.

(b) Q has enolic group thus, gives violet colour with 1% aqueous  $FeCl_{3}$ solution thus, correct.

 (c) S has carbonyl group hence, gives yellow precipitate with 2, 4-DNP  thus, correct.

(d) S does not give colour with $FeCl_{3}$ thus, incorrect.