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Give example for the following types of organic reactions (i) beta- elimination (ii) Electrophilic substitution. |
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Answer» Solution :(i) `beta` - elimination : Elimination reactions involve the cleavage of a `rho` bond and formation of a `pi` bond.A nucleophilic pair of electronsheads into a NEW `pi` bond as a leaving group departs. This PROCESS is called `beta` - elimination because the bond `beta` to the nucleophilic pairof electrons BREAKS. Example: (a) n-propyl bromide on reaction with alcoholic KOH give propens. In this reaction hydrogen and Br are eliminated.  (b) ACID - catalysed dehydration of ALCOHOLS  (ii) Electrophilic substitution: Substiution reactions when are brought about by electrophiles are called electrophilic substitution reaction. Example:(a) Nitration of benzene  (b) Bromination of benzene 
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