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Question

Predict the major product for the following reaction:


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Solution

The correct option is D


Solution:-

  • Above reaction undergoes Electrophilic Substitution Reaction.
  • An electrophilic substitution reaction is a chemical reaction in which the functional group attached to a compound is replaced by an electrophile.
  • The displaced functional group is typically a hydrogen atom.
  • Electrophilic substitution reactions generally proceed via a three-step mechanism that involves the following steps.

Step 1:- Generation of an electrophile

  • The HBr molecule is an electrophile because it accepts a pair of electrons.
  • It splits into H∂+ and Br∂- to protonate the compound.

HBrHδ++Brδ-

Step 2:- Formation of Carbocation

  • In step 2, the attacking electrophile is the already polarised i.e Hydrogen bromide molecule H Br equilibrium open square brackets H to the power of delta plus space end exponent close square brackets plus open square brackets space Br to the power of delta minus sign end exponent close square brackets, which splits to protonate the alkene forming the carbocation and a bromide ion.
  • The HBr molecule is an electrophile because it accepts a pair of electrons from the alkene π bond to form the new C-H bond.

Step 3: Removal of Proton from the intermediate.

  • In step 3,the bromide ion formed in step (1) rapidly combines with the carbocation to form the 2-bromo 4-methyl 3-pentene
  • . The bromide ion donates a pair of electrons to form the new C-Br bond

Hence, Correct Option - D


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