Question

Among the following the pair that is not a pair of metamers?

• A. ${CH}_{3}O{CH}_2{CH}_2{CH}_3$ and ${CH}_3{CH}_2{OCH}_2{CH}_3$
• B. ${CH}_3{OCH}_2{CH}_2{CH}_3$ and ${CH}_{3}OCH{\left({CH}_3\right)}_2$
• C. ${CH}_3{NHCH}_2{CH}_2{CH}_3$ and ${CH}_3{NHCH}_2{CH}_3$
• D. ${CH}_3{COCH}_2{CH}_2{CH}_3$ and ${CH}_3{CH}_2{COCH}_2{CH}_3$

Answer 1

Answer: (C)

${CH}_3{NHCH}_2{CH}_2{CH}_3$ and ${CH}_3{NHCH}_2{CH}_3$

Answer is option $C.$

Metamers are the compounds having the same molecular formula but different number of carbon atoms on either side of the side of the fractional group.

In case of $C{H}_{3}NHC{H}_{2}C{H}_{2}C{H}_3$ and $C{H}_{3}NHC{H}_{2}C{H}_3$,

molecular formula is $C_4{H}_{11}N$ and $C_3{H}_{9}N$ respectively. They differ in molecular formula and hence are not metamers.