Which statements is `//` are correct ?

Options

A. `3-`Methyl pentene `(I)` is the alkene hydrocarbon with the fewest number of `C` atoms that exhibit optical isomerism.
B. `4-`Methylhex`-2-`ene `(II)` is the alkene hydrocarbon with the fewest number os `C` atoms that exhibit both geometrical and optical isomerism.
C. Compound `(I)` in `(a)` shows four stereoisomers.
D. Comound `(II)` in `(b)` shows four stereoisomers.

Answer

a,b,d

Explanation

`c.` False`:` only two isomers are possible.
`d.` True `:` four stereoisomers are as follows `:`

`(I),(II)` and `(III),(IV)implies` two pairs of enantiomers or four `O.A.` isomers.
`(I),(III),(II)(IV),(I,(IV),` and `(II),(III)implies` four pairs of diastereoisomers.
In total, four stereoisomers are possible.