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Give the structural formula of an unsatu...

Give the structural formula of an unsaturated hydrocarbon with the lowest number of `C` atoms (or with lowest molecular mass) which shows:
a. Optical isomers
b. Geometrical isomers
c. Both optical and geometrical isomers

Text Solution

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a. Unsaturated hydrocarbon with lowest molecular mass should have one `(C-=C)`, one `(C=C)`, one H atom, and finally one Me group.

Four different groups
3-Methyl-pent-1-en-4-yne
(A)
b. Geometrical isomerism is shown by `(C=C)` only and not by `(C-=C)`, which shows alkene of the type

In this one R group should have `(C-=C)` and the other R should be a Me group so that the lowest number of C atoms is obtained

c. In compound (A) in solution (a), at `C-1`, put one Me group so that it can show both geometrical and optical isomerism.
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