Complete the following reaction:

1.	Complete the following reaction:
Answer» Solution :The reaction of quinones is that of `ALPHA`, `beta`-UNSATURATED ketone. a. b. C. d. It is an example of Diels-Alder reaction. e. f. g. The reaction is eneretically unfavourable because if Diels-Alder reaction occurs either in benzene ring I or in III (acts as a diene), the aromaticity of one of the benzene rings is lost. Hence, the reaction does not occur. However, anthracene UNDERGOES Diels-Alder reaction (acts as a diene) because the aromaticity of TWO benzene rings is retained. h. Quinhydrone, a green-black, crystalline compounds, is formed. It is formed by `1:1` charge transfer complex, in which hydroquinone is the `bar e` donor and quinone is the `bar e` acceptor. i. Quinhydrone in basic solution is deeply colloured andparamagnetic because of the formation of radical antion. An `bar e` is transferred form the dianino of hydroquinone to quinone. But, two `bar e` 's are required for the reduction of benzoquinone to hydroquinone. In the formation of semiquinone, one `bar e` is transferred.