Of the species, $\mathrm{NO}, \mathrm{NO}^{+}, \mathrm{NO}^{2+}$ and $\mathrm{NO}^{-}$, the one with minimum bond strength is

JEE Main · 2020 · 03 Sep 2020 · Shift 1 · Chemical Bonding and Molecular Structure

Of the species,

NO, NO^{+}, NO^{2 +}

and

NO^{-}

, the one with minimum bond strength is

Answer: (D)

Bond strength follows bond order, which molecular orbital theory fixes from the electron count:

N O^{+}

(14 electrons) has order

3

NO

(15) has

2.5

N O^{2 +}

(13) has

2.5

, and

N O^{-}

(16) has

2

. The lowest order, and so the weakest bond, belongs to

N O^{-}

JEE Main · 2020 · 03 Sep 2020 · Shift 1 · Single correct option