Question

Although ${CN}^{-}$ ion and $N_2$ molecule are isoelectronic, yet $N_2$ molecule is chemically inert because of:

• A. presence of more number of electrons in bonding orbitals
• B. a bond energy
• C. absence of bond polarity
• D. uneven electron distribution

Answer 1

Answer: (C)

absence of bond polarity

Both $C{N}^{-}$ and $N_2$ molecules have the same $MO$ diagrams but differ only in bond polarity.

$C{N}^{-}$ ion is reactive due to the presence of bond polarity.

While $N_2$ is inert due to the absence of bond polarity.