Q.

Among LiCl, BeCl2, BCl3 and CCl4, the covalent bond character follows the order

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a

LiCl > BeCl2 > CCl4 > BCl3

b

CCl4 < BeCl2 > BCl3 > LiCl

c

LiCl < BeCl2 < BCl3 < CCl4

d

LiCl < CCl4 < BCl3 < BeCl2

answer is C.

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Detailed Solution

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Across the period, as we move from Li→Be→B→C, the electronegativity increases and hence the electronegativity difference between the element and Cl decreases and accordingly, the covalent character increases. 

Thus, LiCl < BeCl2 < BCl3 < CCl4 is the correct order of covalent bond character.

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Among LiCl, BeCl2, BCl3 and CCl4, the covalent bond character follows the order