Hydrocarbons - Result Question 85
####88. Select the true statement about benzene amongst the following
[1992]
(a) Because of unsaturation benzene easily undergoes addition
(b) There are two types of $C-C$ bonds in benzene molecule
(c) There is cyclic delocalisation of pi-electrons in benzene
(d) Monosubstitution of benzene gives three isomeric products.
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Solution:
- (c) Benzene do not show addition reaction like other unsaturated hydrocarbons. Due to resonance all the $C-C$ bonds have the same nature, which is possible because of the cyclic delocalisation of $\pi$-electrons in benzene. Monosubstitution will give only a single product.
