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in both 1,2 resonance takes place and a partial double bond character comes btw C and N, making bond length smaller.thus 3 has highest bond length.
among 1,2 structure 2 has ewg at para position and thus extension on resonance increase and makes CN bond even smaller.
thus the required order of bond lentis:
3>1>2
.OPTION C is right.
please let me know if my answer and explanation are right through comment section
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0
Answer:
3>1>2
option c is correct
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