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Question

Which of the following statements is/are true?
  1. Major part of the energy needed for the heterolysis of  CX bond in SN1 reaction mechanism is obtained by the solvation of C+X by the polar protic solvent
  2. 1-pentene gives two bromoalkenes with NBS
  3. Benzyl halides can undergo SN1 most easily over SN2 in protic solvent
  4. Cl+HHCl, is not the chain termination step during photochlorination of ethane


Solution

The correct options are
A Major part of the energy needed for the heterolysis of  CX bond in SN1 reaction mechanism is obtained by the solvation of C+X by the polar protic solvent
C Benzyl halides can undergo SN1 most easily over SN2 in protic solvent
D Cl+HHCl, is not the chain termination step during photochlorination of ethane
(B) 1-pentene gives four products when treated with NBS. 
 
(C) Depending on the solvent, benzyl halides can undergo either SN1 orSN2 . In protic solvents, it will undergo via SN1 mechanism, since the nucleophile is solvated.
(D) H is not formed during photochlorination.

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