The pair of molecules that are metamers among the following is :

1. A. CH3OCH2CH2CH2CH3 and CH3CH2OCH2CH3
2. B. CH3CH2CH2OH and CH3-CH(OH)-CH3
3. C. CH3CH2CH2CH2CH3 and (CH3)2CHCH2CH3
4. D. CH3COCH3 and CH3CH2CHO

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