Question

Question 27 What is the final product of this sequence of reactions? i. Mg, Etz0i. Soa2 Br 11. Co 11. excess NH3 111. H307 P4010 heat O-NH₂ NH2 CN OE I NHCI -NH₂ IV .

Answer 1

In step i., the given tertiary alkyl halide reacts with Mg in presence of diethyl ether to form grignard reagent.

i Mg, Eto - Mg Br be

In step ii. and iii. the grignard reagent reacts with solid CO2 followed by an aqueous acid work up (H3O​+) to form a carboxylic acid which contains one carbon more than the original tertiary alkyl halide we started with as shown.

In next step, the reaction with SOCl​​​2 gives acid chloride as shown

7 MB (i) Co 7 i tot loot

In next step, the acid chloride reacts with excess NH3 to form an amide as shown

-Cool soch -coce tson the

In last step, the reaction with P4O​​​10 (which is a dehydrating agent) the amide gets dehydrated to form a nitrile as shown

Excess coce Excess cole -CONH Nth

CS Nih Heat

So the correct answer is option II.