In the given reaction the number of $\mathrm{sp}^{2}$ hybridised carbon (s) in compound ' X ' is ____.

JEE Main · 2022 · 29 Jun 2022 · Shift 2 · Alcohols Phenols and Ethers

In the given reaction

the number of

sp^{2}

hybridised carbon (s) in compound ' X ' is ____.

Answer: 8

Solution

The reaction shows a Diels-Alder cycloaddition between anthracene (diene) and maleic anhydride (dienophile). The product X retains the two outer benzene rings of anthracene, each contributing 6 sp² carbons. The central ring becomes saturated at the bridgehead positions but the two carbonyl carbons of the anhydride moiety remain sp². Counting: 6 (left benzene) + 2 (carbonyl carbons) = 8 sp² carbons total.

JEE Main · 2022 · 29 Jun 2022 · Shift 2 · Integer answer

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