JEE Main 2022 · 25 Jun · Shift 1 · Chemistry Q61

ChemistrySingle correct+4 / -1Question 61 of 90

Bonding in which of the following diatomic molecule(s) become(s) stronger, on the basis of MO Theory, by removal of an electron ?

(A) NO

(B) $\mathrm{N_2}$

(D) $\mathrm{C_2}$

(E) $\mathrm{B_2}$

Choose the most appropriate answer from the options given below :

(A), (B), (C) only

(B), (C), (E) only

(A), (C) only

(D) only

Answer and worked solution

Official answer: C

Removing an electron strengthens the bond only if it leaves an antibonding orbital.

NO and $\mathrm{O_2}$ : the highest electron is in $\pi^*$ ; bond order rises (2.5 → 3, 2 → 2.5).
$\mathrm{N_2}$ , $\mathrm{C_2}$ , $\mathrm{B_2}$ : the highest electron is bonding; bond order falls.

(A) and (C).

(C)

Topics:Molecular orbital theory

JEE Main 2022 · 25 Jun · Shift 1, Chemistry question 61