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Solution


Q.

The correct order for the rate of α,β-dehydrohalogenation for the following compounds is _______.         [2023]
1 (i) < (ii) < (iii)  
2 (ii) < (i) < (iii)  
3 (iii) < (ii) < (i)  
4 (ii) < (iii) < (i)  

Ans.

(4)

Rate of dehydrohalogenation of the alkyl halides depends on the stability of the alkene formed. Alkene formed in case (i) is most stable (conjugated diene), followed by (iii), which is a more substituted alkene. The alkene formed in case (ii) is least stable as it is least substituted.

∴  Rate of dehydrohalogenation : (ii) < (iii) < (i)