I and II are geometrical isomers of each othe | vedclass

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(C) The given structures represent geometrical isomers of a cumulene system (specifically,a butatriene derivative).In structure $I$,the two terminal $

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$l_2 > l_1$

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(C) The given structures represent geometrical isomers of a cumulene system (specifically,a butatriene derivative).In structure $I$,the two terminal $CH_3$ groups are on the same side of the molecular axis (cis-like configuration),resulting in a shorter distance $l_1$ between them.In structure $II$,the two terminal $CH_3$ groups are on opposite sides of the molecular axis (trans-like configuration),resulting in a longer distance $l_2$ between them.Therefore,by comparing the geometry of the two isomers,we find that $l_2 > l_1$.

$I$ and $II$ are geometrical isomers of each other because

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