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Priyanshu kumar
Option B In 1st purely single bond is present...so less rotation barrier.. In between 2nd and 3rd....In 2nd there is cross conjugation...so partial double bond character comes in both B and C but due to cross conjugation in B...partial double bond character is less.... So 2nd has less rotation barrier than 3rd So overall rotation barrier order I
please ask if any doubt
ok sir so in double bond restricted rotation
yes simun
In single bond no much restriction so less rotation barrier
ok sir tq