Question

The pair of metamers is:

• A. $C_6{H}_5-\underset{\parallel O}{C}-NH-{CH}_3$,
  ${CH}_3-\underset{\parallel O}{C}-NH-C_6{H}_5$
• B. $C_2{H}_5-\underset{\parallel O}{C}-O-\underset{\parallel O}{C}-C_2{H}_5$,
  ${CH}_3-\underset{\parallel O}{C}-O-\underset{\parallel O}{C}-C_3{H}_7$
• C. Both the above
• D. None of the above

Answer 1

The correct option is C Both the above

The metamerism arises when different alkyl groups are attached to same functional group.
Metamerism occures in only polyvalent functional group compounds like, ethers, ketone, sec, amines, ter. amines etc.
$C_6{H}_5-\underset{\parallel O}{C}-NH-{CH}_3$ and ${CH}_3\underset{\parallel O}{C}-NH-C_6{H}_5$
and $C_2{H}_5-\underset{\parallel O}{C}-O-\underset{\parallel O}{C}-C_2{H}_5$ and ${CH}_3-\underset{\parallel O}{C}-O-\underset{\parallel O}{C}-C_3{H}_7$
Both pairs shows metamerism