1.

The compounds CH_3 CH = CH CH_3 and CH_3 CH_2 CH = CH_2 (a) are tautomers (b) are position isomers (c) contain same number of sp^3 sp^3, sp^3 - sp^2 and sp^2 - sp^2 carbon-carbon bonds (d) exist together in dynamic equilibrium (e) are optical isomers

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ANSWER :B


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