Which of the following compounds will show cis-trans isomerism?

(C H_{3})_{2} C = C H C_{2} H_{5}

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H_{2} C = C C l_{2}

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C H_{3} H C = C C l C H_{3}

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H C l C = C H_{2}

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Solution

The correct option is B $C H_{3} H C = C C l C H_{3}$
A. $(C H_{3})_{2} C = C H C_{2} H_{5}$ has two methyl groups attached to the same carbon of the double bond so not possible.

B. $H_{2} C = C C l_{2}$ has two chlorine atoms attached to the same carbon of the double bond. The other carbon has two hydrogen atoms attached to it. So it is not possible.

C. $C H_{3} H C = C C l C H_{3}$ has different groups attached to both carbons of the double bond.

D. $H C l C = C H_{2}$ has two hydrogen atoms attached to the same carbon of the double bond.

Since all compounds have the same groups attached to double bonded carbon atom except in 2-Chlorobut-2-ene, thus only 2-Chlorobut-2-ene exhibit cis-trans isomerism.

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