QJEEAdv20Ch6035: JEE Advanced 2020 Chemistry - Class 12 JEEAdv20Ch6035 Solution: In the following reaction, compound Q is obtained from compound …

Compound (P) on treatment with concentrated H₂SO₄, gives intermediate compound, on delocalisation, gives a coloured compound Q.



Number of rings = 4 + 1 = 5

$\pi$ -bonds = 4 $\times$ 3 + 1 = 13

Thus, the degree of unsaturation of Q is 18.