AP EAMCET Engineering 2012 Solved Paper

CH3CHO

acetaldehyde

Tautomerisation

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CH2=CH−OH

vinyl alcohol

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.

CH3NHC3H7

(methyl−n−propylamine)

and

C2H5NHC2H5

(diethylamine)

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