Question

What is the main product of the reaction between 2-methyl propene with HBr [RPMT 2002]
A) 1-bromo butane B) 1-bromo-2 methyl propane C) 2-bromo butane D) 2-bromo-2 methyl propane

Answer 1

ANSWER:-

➡️D) 2-bromo-2 methyl propane
Markovnikov's product rule

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Answer 2

Answer:

Option (D)2-bromo-2methyl propane

Explanation:

According to Markovnikov's law, when HX is added to an asymmetric alkene, the acidic hydrogen (H) with few alkyl substituents binds to the carbon and the halide group (X) to the carbon with many alkyl substituents.  

Therefore , when HBr is added to 2-methylpropene  ,it follows Markovnikov rule forming most stable carbocation (tertiary) followed by addition of −Br to carbocation to form 2-bromo 2-methyl propane.

Hence , when we react 2-methyl propene with HBr we get 2-bromo 2-methyl propane.

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