Question

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

A
(CH3)2C=CHC2H5
B
H2C=CCl2
C
CH3HC=CClCH3
D
HClC=CH2

Solution

## The correct option is B $$CH_3HC = CClCH_3$$A. $$(CH_3)_2C = CHC_2H_5$$ has two methyl groups attached to the same carbon of the double bond so not possible.B. $$H_2C = CCl_2$$ 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. $$CH_3HC = CClCH_3$$ has different groups attached to both carbons of the double bond.D. $$HClC = CH_2$$ 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.Chemistry

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