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I-A, II-D, III-B, IV-C

I-D, II-A, III-C, IV-B

I-D, II-A, III-B, IV-C

I-A, II-C, III-D, IV-B

answer is C.

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Detailed Solution

-N..H2 - - Nitrogen is more electronegative than carbon ∴ -NH2 group shows -I effect but nitrogen has lp on it. Thus -NH2 group shows +M effect.-CH2CH3- - Alkyl groups are electron pumping groups, they show +I effect always and also +R effect(hyper conjugation) when attached a double bond or carbocation due to the presence alpha hydrogen atoms (hyper conjugation).-C≡N - - Groups containig multiple bonds between dissimilar atoms withdraw electrons by -I, -M effects.-O-- - since oxygen contains a negative charge, it not only shows +M effect but also shows +I effect.

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