Whether the following compounds will show G.I. ? (A) (B) (C) (D)

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Ans. All four compounds (A), (B), (C) and (D) show geometrical isomerism.

Sol. (A) 1-Ethyl-3-methylcyclopentane : Yes. C-1 and C-3 each bear one H and one alkyl group and the two ring paths between them differ, so cis and trans forms exist.

(B) 1-Ethyl-2-methylcyclobutane : Yes. C-1 and C-2 each bear one H and one alkyl group; cis and trans forms exist.

(C) 1-Ethyl-2-methylcyclopentane : Yes. C-1 and C-2 each bear one H and one alkyl group; cis and trans forms exist.

(D) 1,2-Dimethylcyclopentane : Yes. C-1 and C-2 each bear one H and one CH₃; the cis form (both CH₃ on the same face) and the trans form (opposite faces) are different compounds.

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