Which choice(s) correctly rank(s) the bonds in terms of increasing polarity?

Which choice(s) correctly rank(s) the bonds in terms of increasing polarity? I. Cl?F < Br?Cl < Cl?Cl        II. H?C < H?N < H?O      III. Br?F < I?F < Cl?F           IV. Si?Cl < Si?P < Si?C < Si?F

I, II only
II only
II, IV only
I, III, IV only
I only

Answer

More the polarity , weaker is the bond Greater the size of the bonding atoms, lesser is the bond strength. Now, the order of increasing polarity of atoms is :- F > O > Cl > N > C > H Hence the correct option is :-

(b) II only

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