Question

In each reaction box, place the best reagent and conditions from the list below. In each reaction box, place the best reagent and conditions from the list below.

Answer 1

Concepts and reason

This problem is based on the concept of reaction of alkynes.

Alkynes are the hydrocarbons that contain triple bond in their structure. These compounds are highly reactive towards electron deficient species due to their high electron density. They can be converted to dihaloalkanes by a systematic series of reaction.

Fundamentals

An alkyne on birch reduction with ${\rm{Li,}}N{H_3}(l)$ results in the formation of trans-alkene which on further react with bromine molecule to give dihaloalkane.

The reaction of alkyne with ${\rm{Li,}}N{H_3}(l)$ is given below:

The reaction of alkenes with bromine molecule is given below:

Ans:

The overall reaction sequence for this conversion is as follows: