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Question

Stability of intermediates is known to be: Ethyl()<Methyl() and Ethyl.>Methyl. 
This is due to 
 
  1. +I effect of the methyl group in ethyl anion and σp  orbital conjugation in ethyl radical.
  2. - I effect of the methyl group in ethyl anion and σσ conjugation in ethyl radical.
     
  3. Resonance effect of the methyl group in both cases
     
  4. +I effect of the methyl group in ethyl anion and σσ conjugation in ethyl radical.


     


Solution

The correct option is A +I effect of the methyl group in ethyl anion and σp  orbital conjugation in ethyl radical.
CH3¯CH2 is less stable than ¯CH3 as the CH3- group exerts +I effect.

C2H5•  radical is more stable than CH3• , this is due to σp conjugation, also known as hyper conjugation.

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