Question

The acid catalysed hydration of alkene involves the following three steps.
I. Nucleophilic attack of water on carbocation.
II. Protonation of alkene to form carbocation by the electrophilic attack of $H _{3} O ^{+}$.
III. Deprotonation to form an alcohol.
Identify the sequence for the mechanism of reaction in the acid catalysed hydration of alkenes.

• A. $I, II$ and $III$
• B. $II, I$ and $III$
• C. $III, I$ and $II$
• D. $III, II$ and $I$

Answer 1

Answer: (B)

The mechanism of the given reaction involves the following three steps.
Step I Protonation of alkene to form carbocation by electrophilic attack of $H _{3} O ^{+}$.
$H _{2} O + H ^{+} \longrightarrow H _{3} O ^{+}$

Step II Nucleophilic attack of water on carbocation.

Step III Deprotonation to form an alcohol.