Which of the following compounds contain(s) no covalent bond(s) ? $\mathrm{KCl}, \mathrm{PH}_{3}, \mathrm{O}_{2}, \mathrm{~B}_{2} \mathrm{H}_{6}, \mathrm{H}_{2} \mathrm{SO}_{4}$

(A) $\mathrm{KCl}, \mathrm{B}_{2} \mathrm{H}_{6}$

(B) $\mathrm{KCl}, \mathrm{B}_{2} \mathrm{H}_{6}, \mathrm{PH}_{3}$

(C) $\mathrm{KCl}, \mathrm{H}_{2} \mathrm{SO}_{4}$

JEE Main · 2018 · 08 Apr 2018 · Offline · Chemical Bonding and Molecular Structure

Which of the following compounds contain(s) no covalent bond(s) ?

KCl, PH_{3}, O_{2}, B_{2} H_{6}, H_{2} SO_{4}

Answer: (D)

Covalent bonding means shared electron pairs, which every one of

PH X_{3}

O X_{2}

B X_{2} H X_{6}

and

H X_{2} SO X_{4}

contains. Only

KCl

is purely ionic, built from

K X^{+}

and

Cl X^{-}

held by electrostatic attraction with no shared pair, so it alone contains no covalent bond.

JEE Main · 2018 · 08 Apr 2018 · Offline · Single correct option