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JEE Main levelOne or more correct optionsDifficulty 2 of 3hc257

The diene shown reacts with maleic anhydride in a Diels-Alder reaction. Which statements are correct?

  1. AA new six-membered ring is formed from the four diene carbons and two dienophile carbons.
  2. BThe diene is held in the s-cis conformation by its ring.
  3. CThe cis relationship of the two carbonyl groups of maleic anhydride is retained in the adduct.
  4. DThe adduct is a monocyclic compound.

Answer: A, B, C

The compound shown is cyclopentadiene. Its ring locks the double bonds in the s-cis arrangement, so it is very reactive. The [4+2] cycloaddition makes a six-membered ring and, because the dienophile adds suprafacially, the cis geometry of its substituents is kept. The adduct is the bicyclic norbornene derivative, not a monocycle.
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