Question

Consider the following molecules
$I:O_{2}II:O_2\left(As{F}_6\right)III:K{O}_2$

Choose the correct answer.

• A. The correct decreasing bond order is $I>III>II$
• B. The correct decreasing order of bond length is $III>I>II$
• C. The bond strength of I is less than that of $III$
• D. Bond dissociation energy is highest in case of $III$

Answer 1

Answer: (B)

The correct decreasing order of bond length is $III>I>II$

In $O_2\left(As{F}_6\right)$, $O_2^{+}$ has bond order 2.5.

$O_2$ has bond order 2.0.

In $K{O}_2$, $O_2{}^{-}$ has bond order 1.5.

So higher the bond order means to lower the bond length,

So, the correct option is $B$.