Arrange the following in increasing order of their covalent character. (A) $\mathrm{CaF}_{2}$ (B) $\mathrm{CaCl}_{2}$ (C) $\mathrm{CaBr}_{2}$ (D) $\mathrm{CaI}_{2}$ Choose the correct answer from the options given below.

JEE Main · 2022 · 26 Jul 2022 · Shift 2 · Chemical Bonding and Molecular Structure

Arrange the following in increasing order of their covalent character.
(A)

CaF_{2}

(B)

CaCl_{2}

(C)

CaBr_{2}

(D)

CaI_{2}

Choose the correct answer from the options given below.

Answer: (B)

According to Fajan's rule, covalent character is directly proportional to the size of the anion. The anion size order is

F^{-} < Cl^{-} < Br^{-} < I^{-}

. Therefore, the covalent character order is

CaF_{2} < CaCl_{2} < CaBr_{2} < CaI_{2}

, which is A

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D. Answer: (B).

JEE Main · 2022 · 26 Jul 2022 · Shift 2 · Single correct option