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  3. Chemistry
  4. Ordinarily the barrier to rotation about a carbon-carbon double bond is quite high but in compound P double bond between two rings was observed by NMR to have a rotational energy barrier of only about 20 cal/mol., showing that it has lot of single bond character. <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/c-jzylt1nomcqj.png /> The reason for this is

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Q. Ordinarily the barrier to rotation about a carbon-carbon double bond is quite high but in compound P double bond between two rings was observed by NMR to have a rotational energy barrier of only about 20 cal/mol., showing that it has lot of single bond character.

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