Question

Why option (a) doesn't exhibit tautomerism and all others exhibit Tautomerism??

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Answer 1

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Why doesn't option(a) exhibit tautomerism?

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Condition for exhibiting tautomerism :

Carbonyl compound containing at least one 'alpha hydrogen' atom on sp³ hybridized carbon exhibits tautomerism.

Now, the carbonyl compound representing option(a) shows sp³ hybridization(4 spaces). Hence, there is no position to contain alpha hybridized carbon on it.

• Option(b) contain only 2 sp³ hybridized carbons and there is space for alpha hybridized carbon

• Option(c) and option(d) also had the position for alpha hybridized carbons and hence, they exhibit tautomerism.

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