On electrolysis an alcoholic solution of sodium chloride gives a sweet smelling liquid (A) which gives carbylamine reaction and condenses with acetone to form hypnotic . What is (A) ? Ginve reactions of its formation.

Explanation

`NaCI hArr Na^(+) +CI^(-).` At anode `CI_(2)` is discharged and electrolytic solution contains NaOH on electrolysis `CI_(2)` oxidises alcohol to acetaldehyde which is chlorinated to chloral. Chloral on hydrolysis yields chloroform.
`C_(2)H_(5)OHoverset(CI_(2))underset([O])(to) CH_(3)CHO overset(CI_(2))(to) C CI_(3)CHOoverset(NaOH)(to)`
`underset((A))(CHCI_(3))+HCOONa`