MCQ
$\mathop {C{H_3} - CH = O}\limits_{(I)} \rightleftharpoons \mathop {C{H_2} = CH - OH}\limits_{(II)} $
Between the two tautomers which is more stable ?
- ✓$I$
- B$II$
- C$I = II$
- Dnone of these
✓
Answer
Correct option: A.
$I$
a
$(a)$ Higher the bond energy of $> C = O.$
$(a)$ Higher the bond energy of $> C = O.$
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$\begin{matrix}{\ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3\\ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\text{CH}_3-\text{C}^\oplus\\ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3} & { \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3\\ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\text{CH}_3-\text{C}^\oplus\\ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\ \ \ \ \ \ \ \ \ \ \ \ \ \text{H} } & {\text{CH}_3\stackrel{{\oplus} }{\hbox{CH}_2}} & \stackrel{{\oplus} }{\hbox{CH}_3} \\ \ \ \ \ \ \ \ \ \text{I} & \ \ \ \ \ \ \ \text{II} & \ \ \text{III} & \text{IV} \end{matrix}$
→$\begin{matrix}{\ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3\\ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\text{CH}_3-\text{C}^\oplus\\ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3} & { \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3\\ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\text{CH}_3-\text{C}^\oplus\\ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\ \ \ \ \ \ \ \ \ \ \ \ \ \text{H} } & {\text{CH}_3\stackrel{{\oplus} }{\hbox{CH}_2}} & \stackrel{{\oplus} }{\hbox{CH}_3} \\ \ \ \ \ \ \ \ \ \text{I} & \ \ \ \ \ \ \ \text{II} & \ \ \text{III} & \text{IV} \end{matrix}$