Question

$CHC{l_3}$on reaction with acetone in basic medium gives a compound used as:
(A) tear gas
(B) hypnotic
(C) pesticide
(D) anesthetic

Answer 1

Hint: Acetone contains carbonyl group in it. Carbonyl groups undergo addition reactions. This reaction based on the concept that chloroform $[CHC{l_3}]$ added on carbonyl group

of acetone.

Complete step by step answer:
Let us write chemical equations for a given statement.
Chloroform $[CHC{l_3}]$ reacts with acetone

in basic medium $[KOH]$ and undergoes an addition reactions.

This chlorine formed is a sleep inducing drug.
Therefore, used as hypnotic.
Mechanism:

The anions of reactant $C{H_3}C{O^ - }$ and $CCl_3^ - $ form bonds with cations ${H^ + }$and $CH_3^ + $ respectively.

Therefore, from the above explanation the correct option is (B) Hypnotic.

Additional Information:
When acetone and chloroform are mixed together heat is evolved due to formation of hydrogen bonds between chloroform and acetone. This mixture forms a non-ideal solution and shows negative deviation from Raoult’s law.
But in the presence of strong alkali it gives chlorine.
due to increased intermolecular attraction and decreases vapor pressure.
At a specific composition, acetone and chloroform will form maximum boiling azeotrope.
Azeotrope are composed of one or more liquids having very similar boiling points even having different molecules weight.

Note:
For formation of chloretone basic medium is required mixture due to hydrogen bonding present between them.