Q.34. Which among the following is haloalkyne?
A. CH3−CH2−CH=CH−X
B. CH3−C=C−CH2−X
C. CH≡C−CH2−CH2−X
D. CH3−CH2−C≡C−X
Answer :- D. CH3−CH2−C≡C−X
Explanation :-
Haloalkynes are compounds that contain a halogen atom (such as fluoride, chlorine, bromine, or iodine) directly bonded to a carbon atom that is part of a carbon-carbon triple bond. In other words, for a compound to be classified as a haloalkyne, it must have a functional group that consists of both a carbon-carbon triple bond (alkyne part) and a halogen atom attached to one of the carbon atoms involved in the triple bond.
Now, let’s examine the provided options:
Option A: CH3−CH2−CH=CH−X
This is not a haloalkyne because it has a carbon-carbon double bond rather than a triple bond, so it would be classified as a haloalkene.
Option B: CH3−C=C−CH2−X
Although this compound contains a carbon-carbon triple bond, the halogen is not attached to one of the carbons participating in that triple bond. Thus, this compound is not a haloalkyne either.
Option C: CH≡C−CH2−CH2−X
Similar to Option B, this compound has a carbon-carbon triple bond and a halogen, but the halogen is not directly attached to the carbon-carbon triple bond, so this is also not a haloalkyne.
Option D: CH3−CH2−C≡C−X
This compound has a carbon-carbon triple bond and a halogen atom directly bonded to one of the carbon atoms of the triple bond, making it a haloalkyne.
Therefore, the correct answer is:
Option D: CH3−CH2−C≡C−X
It is the haloalkyne among the given options because it has the halogen atom (X) directly connected to a carbon that is part of an alkyne group.