Question

Assertion :The covalent radii reported for $F,O$ and $N$ are remarkably different from the values obtained from $F-F$ $(=144$ pm$)$, $HO-OH$ $(=148$ pm$)$ and $H_{2}N-N{H}_2$ $(=147$ pm$)$ respectively. Reason: The elongated bond lengths in $F-F,O-O$ and $N-N$ bonds arise probably due to the repulsion among the non-bonding electrons housed on adjacent atoms.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

The covalent radii reported for $F,O$ and $N$ are different from the values from $F-F,HO-OH$ and $H_{2}N-N{H}_2$ respectively.

All the species $(F-F,O-O$ and $N-N)$ have more than 2 lone pairs. These lone pairs repel each other according to VSEPR theory. This replusion causes the bond length to increase. Hence, both assertion and reson are correct and reason is the correct explanation of assertion.