Question

The main difference in $C-X$ bond of a haloalkane and a haloarene is:

• A. $C-X$ bond in haloalkanes is shorter than haloarnes.
• B. In haloalkanes, the $C$ attached to halogen in $C-X$ bond is $s{p}^3$ hybridised while in haloarenes it is $s{p}^2$ hybridised.
• C. $C-X$ bond in haloarenes acquire a double bond character due to the higher electronegativity of $X$ than haloalkanes.
• D. Haloalkanes are less reactive than haloarenes due to difficulty in $C-X$ cleavage in haloalkanes.

Answer 1

Answer: (B)

In haloalkanes, the $C$ attached to halogen in $C-X$ bond is $s{p}^3$ hybridised while in haloarenes it is $s{p}^2$ hybridised.

There is a difference in hybridisation of $C-X$ bond i.e, in haloalkanes is $s{p}^3$ but in haloarenes, the hybridisation is $s{p}^2$.

So, the halogen atom is held more tightly in haloarenes and does not get substituted easily. Therefore, there is a difference in the $C-X$ bond of haloalkane and haloarene.