Question

why should we use ISO in isopropylidene dichloride as there is no methyl group attached to second carbon atom of parent chain​

Answer 1

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1. WHEN U ROTATE THE STRUCTURE @ 90 DEGREES.

The line attached with chlorine becomes horizontal and imagine it as a principle chain grp.

now 2 methyl groups are attached with the second carbon of the main chain.

Hence , we use ISO ptrefix in nomenclature.