Shib Sagar posted an Question
September 21, 2020 • 14:46 pm 30 points
  • IIT JAM
  • Chemistry (CY)

Please solve this problem

(a) P>Q>R>S (b) S: 107. What will be the order of rotation b)I

2 Answer(s) Answer Now
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    Priyanshu kumar Best Answer

    Option B is correct

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    In 1st purely single bond is present...so less rotation barrier..

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    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....

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    So 2nd has less rotation barrier than 3rd

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    So overall rotation barrier order I

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