JEE Main · 2022 · 29 Jul 2022 · Shift 1 · Chemical Bonding and Molecular Structure

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

(A) $BCl_{3}$ and $SF_{6}$
(B)NO and $H_{2} SO_{4}$ ✓ Correct
(C) $SF_{6}$ and $H_{2} SO_{4}$
(D) $BCl_{3}$ and NO

Answer: (B)

Solution

NO is an odd-electron molecule (total valence electrons = 5 + 6 = 11, which is odd).

H_{2} SO_{4}

has sulfur with 12 electrons in its outer shell (expanded octet). In contrast,

BCl_{3}

is an even-electron molecule (incomplete octet), and

SF_{6}

is an even-electron expanded octet molecule. Therefore, option (B) is the only pair containing both an odd-electron molecule and an expanded octet molecule.

JEE Main · 2022 · 29 Jul 2022 · Shift 1 · Single correct option

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