Question

\[\begin{array}{cc}
\ce{CH3 - C ≡ CH ->[40{%} H2SO4][1{%} HgSO4] A ->[Isomerisation] CH3 - C - CH3}\\
\phantom{........................................}||\\
\phantom{........................................}\ce{O}\\
\end{array}\]

Structure of ‘A’ and type of isomerism in the above reaction are respectively.

Options

• Prop–1–en–2–ol, metamerism

• Prop-1-en-1-ol, tautomerism

• Prop-2-en-2-ol, geometrical isomerism

• Prop-1-en-2-ol, tautomerism

Answer 1

Prop-1-en-2-ol, tautomerism

Explanation:

\[\begin{array}{cc}
\phantom{}||\\
\phantom{}/\backslash\\
\phantom{.....}\ce{OH}
\end{array}\]

Prop-1-en-2-ol

\[\begin{array}{cc}
\ce{CH3 - C ≡ CH ->[40{%} H2SO4][1{%} HgSO4] CH3 - C ≡ CH3 ->[Isomerisation] CH3 - C - CH3}\\
\phantom{..............................}|\phantom{...........................}|\phantom{....}\\
\phantom{...........................}\ce{\underset{\underset{(A)}{Prop-2-en2-ol}}{OH}}\phantom{...................}\ce{\underset{Acetamine}{OH}}\phantom{}\\
\end{array}\]

Tautomers are structural isomers that exist in two or more interconvertible structures of a single chemical molecule. Tautomerism transforms 'A' into acetone.