Question

The $C-H$ bond distance is the longest in:

• A. $C_2{H}_6$
• B. $C_2{H}_{2}B{r}_2$
• C. $C_2{H}_4$
• D. $C_2{H}_2$

Answer 1

The correct option is A $C_2{H}_6$

$\Rightarrow$ Higher the $s-$ character means that the Bonded pair electrons are held more closely, ensuring a smaller Bond length and a stronger bond.
So, $sp$ has the least bond length and it is the strongest
$s{p}^3$ has longest bond length and weakest.
So, $A$ is the correct answer.