Which of the following can show tautomerism?

(i), (ii) and (iii)

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(i), (ii), (iii), and (iv)

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only (i) and (ii)

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only (ii) and (iv)

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Solution

The correct option is A (i), (ii) and (iii)
To show tautomerisation, there should be atleast one $α -$ H. No $α -$ H is there in (iv), so it does not show tautomerisation.

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In which of the following molecules carbon atom marked with asterisk (*) is asymmetric?

(a) (i), (ii), (iii) and (iv) (b) (i) ,(ii) and (iii)

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