Which of the following statements is wrong?

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(A) . Diethyl ketone $(CH_3CH_2COCH_2CH_3)$ and methyl propyl ketone $(CH_3COCH_2CH_2CH_3)$ are functional isomers (both are ketones),but specifically

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Diethyl ketone and methyl propyl ketone are position isomers

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(A) . Diethyl ketone $(CH_3CH_2COCH_2CH_3)$ and methyl propyl ketone $(CH_3COCH_2CH_2CH_3)$ are functional isomers (both are ketones),but specifically,they are metamers because the alkyl groups attached to the carbonyl group are different. They are not position isomers. Thus,this statement is wrong.$B$. $2-$chloropentane and $1-$chloropentane differ in the position of the chlorine atom on the carbon chain,so they are position isomers. This is correct.$C$. $n-$butane (straight chain) and $2-$methylpropane (branched chain) are chain isomers. This is correct.$D$. Acetone $(CH_3COCH_3)$ is a ketone,while propionaldehyde $(CH_3CH_2CHO)$ is an aldehyde. They have the same molecular formula $(C_3H_6O)$ but different functional groups,so they are functional isomers. This is correct.

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