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Q.

(A) : Ethers, ketones and secondary amines can exhibit metamerism.
(R) : Ethers, ketones and secondary amine are divalent functional groups.

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a

A and R are true, R explains A

b

A and R are true, R does not explain A

c

A is true, but R is false

d

A is false, but R is true

answer is A.

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Detailed Solution

  • Metamers are isomers that share the same molecular formula but have distinct alkyl groups on both sides of functional groups. This isomerism phenomena is known as metamerism. 
  • Metamers include, for example, diethyl ether and methyl propyl ether.
  •  Ethers having same molecular formula but different alkyl groups on either side of the oxygen atoms show metamerism and the same goes for ketone. Esters, ketone, aldehyde, imine, and other divalent functional groups are those with valency two.
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