Question

The correct statement(s) about the following reaction sequence is/are:
$Cumene\left(C_9{H}_{12}\right)\underset{ii)H_3{O}^{+}}{\overset{i)O_2}{\to }}P\stackrel{CHC{l}_3/NaOH}{\to }Q\left(major\right)+R\left(minor\right)$

$Q\underset{PhC{H}_{2}Br}{\overset{NaOH}{\to }}S$

• A. R is steam volatile
• B. Q gives a dark violet coloration with $1\%$ aqueous $FeC{l}_3$ solution
• C. S gives an yellow precipitate with 2, 4-dinitrophenylhydrazine
• D. S gives a dark violet coloration with $1\%$ aqueous $FeC{l}_3$ solution

Answer 1

Answer: (B), (C)

The correct options are
B Q gives a dark violet coloration with $1\%$ aqueous $FeC{l}_3$ solution
C S gives an yellow precipitate with 2, 4-dinitrophenylhydrazine


Q (not R) is steam volatile due to intramolecular hydrogen bonding.

Q gives violet colouration due to phenolic functional group.

S gives yellow precipitate due to aldehydic group with 2, 4 –DNP.

S does not have a free phenolic group to respond to $FeC{l}_3$ test.