Question

Which of the following is correct order of bond length?

• A.
• B.
• C.
• D.

Answer 1

The correct option is A

First, check out for bond order.

F - F $\Rightarrow$ Bond order = 1

O = O $\Rightarrow$ Bond order = 2

N ≡ N $\Rightarrow$ Bond order = 3

H - H $\Rightarrow$ Bond order = 1


Now, as F, N and O are from same period and we know that

$Bondorder\propto \frac{1}{Bondlength}$
Therefore, $N_2<O_2<F_2$

And H - H bond length will be least because H is very small compared to second period elements.

$\Rightarrow$ For bond length

$F_2>O_2>N_2>H_2$