1.

The correct statement about the following reaction sequence is(are) Cumene (C_9H_12)underset((ii)H_3O^+)overset((i)O_2)to P overset(CHCl_3//NaOH)to Q"(major)" + "R (min or )" Q underset(PhCH_2Br)overset(NaOH)to S

Answer»

R is steam volatile
Q gives dark violet coloration with 1% aqueous `FeCl_3` solution
S gives yellow PRECIPITATE with 2,4-dinitrophenylhydrazine
S gives dark violet COLOURATION with 1% aqueous `FeCl_3` solution

Solution :
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 FREE phenolic group to respond to `FeCl_3` test.


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