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Although benzene is highly unsaturated, ...

Although benzene is highly unsaturated, it does not undergo addition reactions?

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Because of extra stability due to delocalization of .pi. -electrons, the double bonds of benzene usually do not undergo addition reactions.
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Four statements about benzene molecule are given below. Of these which is the correct statement justify your answers. i. Because of unsaturation benzene easily undergoes addition reaction. ii, There are two types of C-C bonds in benzene molecule. iii. There is a cyclic delocalisation of 'pi' electrons in benzene iv. Di substitution of benzene group gives two isomeric substances.

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