The C-H bond distance is the longest in

Question

The C-H bond distance is the longest in (A) C 2 H 2 (B) C 2 H 4 (C) C 2 H 4 Br 2 (D) C 6 H 6

Tardigrade Admin · Accepted Answer

As the s-character or number of π-electrons increases, bond length decreases. <img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/chemistry/ab49a598510f5a61041b8b33d4259389-.png" /> Therefore, C 2 H 4 Br 2 due to the absence of π-electrons or due to the presence of lesser s-character (25 %), has the longest C - H bond distance.

Q. The $C - H$ bond distance is the longest in

$C_{2} H_{2}$

$C_{2} H_{4}$

$C_{2} H_{4} B r_{2}$

$C_{6} H_{6}$

As the $s$ -character or number of $π$ -electrons increases, bond length decreases.

Therefore, $C_{2} H_{4} B r_{2}$ due to the absence of $π$ -electrons or due to the presence of lesser $s$ -character $(25%)$ , has the longest $C - H$ bond distance.

Q. The C−H bond distance is the longest in

C2​H2​

C2​H4​

C2​H4​Br2​

C6​H6​