Diethyl ether and n-propyl methyl ether are:

metamers

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chain isomerism

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geometrical isomerism

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position isomerism

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Solution

The correct option is B metamers
$C_{2} H_{5} - O - C_{2} H_{5}$ $C H_{3} - O - C_{3} H_{7}$
diethylether n-propymethylether
Metamerism is when there are different number of carbon atoms at either side of the functional group. Diethylether has two carbons on both sides, so it is symmetric and n-propyl methyl ether has one methyl and one propyl on either sides. Hence, both are metamers.

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