Question

When alcohol react with concentrated H₂SO₄ intermediate compound formed is

Options

• Carbonium ion

• Alkoxy ion

• Alkyl hydrogen sulphate

• None of these

Answer 1

Carbonium ion

Explanation:

\[\begin{array}{cc}
\phantom{}|\phantom{....}|\phantom{.........}|\phantom{....}|\phantom{.....}\\
\phantom{}\ce{- C - C - \overset{H'}{⇌} C - C - \overset{-H2O}{⇌}}\\
\phantom{}|\phantom{....}|\phantom{.........}|\phantom{....}|\phantom{.....}\\
\phantom{.......}\ce{H}\phantom{..}\ce{OH}\phantom{.......}\ce{\underset{\underset{alcohal}{Protouated}}{H\phantom{..}+OH2}}\phantom{.......}
\end{array}\]

 

\[\begin{array}{cc}
\phantom{}|\phantom{....}|\phantom{.........}|\phantom{....}|\phantom{}\\
\phantom{}\ce{- C - C - \overset{H'}{⇌} C - C -}\\
\phantom{}|\phantom{....}|\phantom{.........}|\phantom{....}|\phantom{}\\
\ce{\underset{\underset{10n}{Carbonium}}{H}}\phantom{..................}
\end{array}\]

intermediate is carbonium ion, and there may be 1 – 2 hydride or 1, 2 methyl shift to form more stable carbonium ion.