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Match the following.

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The correct answer is:
$\begin{array}{llll}2 & 4 & 1 & 5\end{array}$

Thus, these two are tautomers.
Eclipsed and staggered ethane are two conformations of ethane.
(+)2-butanol and (-)2-butanol are enantiomers as these are non-superimposable mirror images.



Due to difference in the nature of alkyl groups attached to the same functional group, these are called metamers.
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