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In which of the following pair(s), the first molecular has longer indicated bond length than the second molecule ?

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$C H_{2} \underset{↑}{=} C H - N H_{2}$ and $C H_{2} \underset{↑}{=} C H - O C H_{3}$

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$C H_{2} \underset{↑}{=} C H - C H = C H_{2}$ and $C H \underset{↑}{_{2} =} C H - N O_{2}$

answer is A, C, D.

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Detailed Solution

In (b) C = C has more delocalisation of pibond in second molecule due to strong electron withdrawing effect of –NO₂. Hence,
indicated bond of second molecule has lower bond order and longer length than the first molecule.

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