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(D) $Ia$ and $Ib$: Both are $1, 2-$dichlorobenzene. Hence,they are identical compounds.$IIa$ and $IIb$: Both are $1, 3-$dimethylbenzene. Hence,they ar

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$Ia$ and $Ib$ are identical; $IIa$ and $IIb$ are identical; and $IIIa$ and $IIIb$ are isomers

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(D) $Ia$ and $Ib$: Both are $1, 2-$dichlorobenzene. Hence,they are identical compounds.$IIa$ and $IIb$: Both are $1, 3-$dimethylbenzene. Hence,they are identical compounds.$IIIa$ and $IIIb$: $IIIa$ is $1, 4-$benzenedicarboxylic acid (terephthalic acid) and $IIIb$ is $1, 3-$benzenedicarboxylic acid (isophthalic acid). Hence,they are position isomers.

Examine the following three pairs of possible isomers. Now state whether the pairs represent identical compounds or different isomers.

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