Question

When propene reacts with HBr, two products are formed out of which one is predominates the other. Identify the minor product.

(a) 1-Bromopropane

(b) 2-Bromopropane

(c) 1-Bromobutane

(d) 2-Bromobutane

The question was asked in an online quiz.

Question is from Methods of Preparation of Haloalkanes in division Haloalkanes and Haloarenes of Chemistry – Class 12

Answer 1

Right answer is (a) 1-Bromopropane

To explain I would say: According to Markovnikov’s rule, the negative part of the reagent (Br) attaches itself to the C atom with lesser number of hydrogen atoms. Hence, the Br attaches majorly to the second C atom of propane and forms 2-Bromopropane as the major product.