Question

According to Markownikoff rule product formed by the reaction on 1-butene with water is:

• A. primary alcohol
• B. secondary alcohol
• C. tertiary alcohol
• D. none of these

Answer 1

Answer: (B)

secondary alcohol

Markovnikov's rule states that with the addition of HX to an unsymmetrical alkene,the acid hydrogen (H) becomes attached to the carbon with fewer alkyl substituents, and the halide(X) group becomes attached to the carbon with more alkyl substituents.

Alternatively, the rule can be stated that the hydrogen atom is added to the carbon with the greater number of hydrogen atoms while the X component is added to the carbon with the fewer number of hydrogen atoms

When $H_{2}O$ is added to $C{H}_2=CHC{H}_{2}C{H}_3$, Markovnikov addition takes place to form secondary carbocation followed by addition of -OH to secondary carbocation to form secondary alcohol.