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a
N-H>P-H>As-H>Sb-H
b
C - H bond in CH4 < C - H bond in CH2F2
c
N - H > O - H > F - H
d
LiF < LiCl < LiBr < LiI
answer is B.
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Detailed Solution
Polarity ∝|ΔEN|(1) N(3.0)−H(2.1)>Sb(1.8)−H(2.1)>As(1.9)−H(2.1)>P(2.1)−H(2.1)(2) EN of carbon atom in CH2F2>CH4 due to more positive charge on carbon atom in CH2F2. (3) F(4.0)−H(2.1)>O(3.5)−H(2.1)>N(3.0)−H(2.1)(4) Li+(1.0)…F−(4.0)>Li(1.0)−Cl(3.0)>Li(1.0)>Br(2.8)>Li(1.0)>I(2.5)