Question

$O_{2}F_{2}$ is an unstable yellow orange solid and $H_{2}O_{2}$ is colourless liquid. $O-O$ bond length in $H_{2}O_{2}$ and $O_{2}F_{2}$ respectively are

• A. $\text{1} \text{.22} \, \mathring{A} , \, \text{1} \text{.48} \, \mathring{A} $
• B. $\text{1} \text{.48} \, \mathring{A} , \, \text{1} \text{.22} \, \mathring{A} $
• C. $\text{1} \text{.22} \, \mathring{A} , \, \text{1} \text{.22} \, \mathring{A} $
• D. $\text{1} \text{.48} \, \mathring{A} , \, \text{1} \text{.48} \, \mathring{A} $

Answer 1

Answer: (B)

$x_{1}>x_{2}$

According to Bent's rule in $O_{2}F_{2}$ , there is more p-character in $O-F$ bond in comparison to $O-H$ bond in $H_{2}O_{2};$ hence s-character in $O-O$ bond is greater in $O_{2}F_{2}$ .