JEE Main 2022 — Chemistry Inorganic Chemistry

2022mcqeasy

Which of the following pair of molecules contain odd electron molecule and an expanded octet molecule?

Official previous-year question

Held on 29 Jul 2022 · Verified 6 Jul 2026.

Options

A
${\mathrm{BCl}}_{3}$ and ${\mathrm{SF}}_{6}$
B
$\mathrm{NO}$ and ${H}_{2}{\mathrm{SO}}_{4}$
C
${\mathrm{SF}}_{6}$ and ${H}_{2}{\mathrm{SO}}_{4}$
D
${\mathrm{BCl}}_{3}$ and $\mathrm{NO}$

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Solution

An odd electron bond means there is an odd number of the electron in the overall molecule. Or we can say that the molecule has unpaired electrons.

So, in $\mathrm{NO}$ , the valence electrons in nitrogen are $5$ , and valence electrons in oxygen are $6$ . So, by adding we get, $6+5=11$

In sulfuric acid $({H}_{2}{\mathrm{SO}}_{4})$ , each oxygen has a full octet (eight valence electrons), whereas sulfur has an expanded octet (twelve valence electrons).

JEE Main 2022 Chemistry, Chemical Bonding and Molecular Structure — solution figure

(A) ${\mathrm{BCl}}_{3}\rightarrow$ Even Electron molecule ${\mathrm{SF}}_{6}\rightarrow$ Expanded octet molecule

(B) $\mathrm{NO}\rightarrow$ Odd Electron molecule ${H}_{2}{\mathrm{SO}}_{4}\rightarrow$ Expanded octet.

(D) ${\mathrm{BCl}}_{3}\rightarrow$ Even Electron molecule $\mathrm{NO}\rightarrow$ Odd Electron molecule

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Solution

An odd electron bond means there is an odd number of the electron in the overall molecule. Or we can say that the molecule has unpaired electrons.

So, in $\mathrm{NO}$ , the valence electrons in nitrogen are $5$ , and valence electrons in oxygen are $6$ . So, by adding we get, $6+5=11$

In sulfuric acid $({H}_{2}{\mathrm{SO}}_{4})$ , each oxygen has a full octet (eight valence electrons), whereas sulfur has an expanded octet (twelve valence electrons).

JEE Main 2022 Chemistry, Chemical Bonding and Molecular Structure — solution figure

(A) ${\mathrm{BCl}}_{3}\rightarrow$ Even Electron molecule ${\mathrm{SF}}_{6}\rightarrow$ Expanded octet molecule

(B) $\mathrm{NO}\rightarrow$ Odd Electron molecule ${H}_{2}{\mathrm{SO}}_{4}\rightarrow$ Expanded octet.

(D) ${\mathrm{BCl}}_{3}\rightarrow$ Even Electron molecule $\mathrm{NO}\rightarrow$ Odd Electron molecule

JEE Main 2022 — Chemistry Inorganic Chemistry

Options

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Solution

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JEE Main 2022 — Chemistry Inorganic Chemistry

Options

Did you get this right?

Solution

Your note

JEE Main Inorganic Chemistry in other years

More JEE Main Inorganic Chemistry questions

Other Chemistry topics for JEE Main

Physical Chemistry

Organic Chemistry

Keep practicing Inorganic Chemistry