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Q.

The wrong statement in the following is

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a

sulphonation of benzene takes place only with hot concentrated sulphuric acid 

b

In the nitration mixture concentrated sulphuric acid is used for the formation of nitronium   ion

c

Because of unsaturation benzene easily undergoes addition reactions

d

Benzene burns with a sooty flame

answer is C.

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Detailed Solution

  • The replacement of a hydrogen atom by a sulphonic acid group in a ring is called sulphonation. 
  • It is carried out by heating benzene with fuming sulphuric acid (oleum).
  • Question Image
  • Question Image
  • Due to extra stability by the delocalization of π−electrons, the double bonds of benzene usually do not undergo addition reactions.
  • Benzene is an aromatic hydrocarbon and hence burns with a sooty flame.
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