Among LiCl, BeCl_2, BCl_3 and CCl_4, the covalent bond character follows the order

JEE Main Chemistry question

Among and , the covalent bond character follows the order

(A)LiCl > BeCl_2 > BCl_3 > CCl_4
(B)LiCl < BeCl_2 < BCl_3 < CCl_4Correct
(C)LiCl > BeCl_2 > CCl_4 > BCl_3
(D)LiCl < BeCl_2 < BCl_3 > CCl_4

Answer: (B)

Solution

Covalent character increases as the charge on the cation increases and its size decreases (Fajans' rules), since a smaller, more highly charged cation polarises the anion's electron cloud more strongly. Going from

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Question ID VK-133384