(D) The molecular formula $C_4H_8$ corresponds to butene isomers. $1$-butene and $2$-butene exhibit chain and positional isomerism. $2$-butene exhibit

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(D) The molecular formula $C_4H_8$ corresponds to butene isomers. $1$-butene and $2$-butene exhibit chain and positional isomerism. $2$-butene exhibits geometrical isomerism. However,none of the isomers of $C_4H_8$ contain a chiral carbon atom,therefore they do not exhibit optical isomerism.