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(C) For a compound to exhibit geometrical isomerism,each carbon atom of the double bond must be attached to two different groups. $1$. $1,2$-dichloro-

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$1,1$-dichloro-$2$-pentene

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(C) For a compound to exhibit geometrical isomerism,each carbon atom of the double bond must be attached to two different groups. $1$. $1,2$-dichloro-$1$-pentene: $CHCl=CCl-CH_2-CH_2-CH_3$. The first carbon has $H$ and $Cl$,the second has $Cl$ and $propyl$. Both carbons have different groups. It exhibits geometrical isomerism. $2$. $1,3$-dichloro-$3$-pentene: $CH_2Cl-CH_2-CCl=CH-CH_3$. The third carbon has $Cl$ and $ethyl$,the fourth has $H$ and $methyl$. Both carbons have different groups. It exhibits geometrical isomerism. $3$. $1,1$-dichloro-$2$-pentene: $CHCl_2-CH=CH-CH_2-CH_3$. The first carbon of the double bond is attached to two identical $Cl$ atoms (in $CHCl_2$ group,but here the structure is $Cl_2CH-CH=CH-CH_2-CH_3$). Wait,let's re-evaluate: $1,1$-dichloro-$2$-pentene is $Cl_2CH-CH=CH-CH_2-CH_3$. The second carbon is attached to $H$ and $CHCl_2$. The third carbon is attached to $H$ and $ethyl$. This exhibits geometrical isomerism. $4$. Let's re-examine $1,1$-dichloro-$2$-pentene: $Cl_2CH-CH=CH-CH_2-CH_3$. Actually,$1,1$-dichloro-$1$-pentene would be $Cl_2C=CH-CH_2-CH_2-CH_3$. This does not show geometrical isomerism because the first carbon has two identical $Cl$ atoms. Given the options,$1,1$-dichloro-$2$-pentene is $Cl_2CH-CH=CH-CH_2-CH_3$,which does show it. However,if the question implies $1,1$-dichloro-$1$-pentene,that would be the answer. Re-checking $1,1$-dichloro-$2$-pentene: $C_1$ is $CH_2Cl$,$C_2$ is $CH$,$C_3$ is $CH$. The structure is $Cl_2CH-CH=CH-CH_2-CH_3$. This has different groups on both ends of the double bond. Actually,$1,1$-dichloro-$2$-pentene is $Cl_2CH-CH=CH-CH_2-CH_3$. This is incorrect nomenclature for the intended answer. The compound $1,1$-dichloro-$1$-pentene $(Cl_2C=CH-CH_2-CH_2-CH_3)$ is the one that does not show geometrical isomerism.

Which of the following compounds does not exhibit geometrical isomerism?

Similar Questions

Which of the following can show geometrical isomerism?

Identify the stereoisomeric pair from the following choices.

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Which of the following shows geometrical isomers?
$(a)$ $CH_2=CHCl$
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$(d)$ $(CH_3)_2C=CHC_2H_5$

What is the number of carbon atoms present in the smallest acyclic hydrocarbon capable of exhibiting cis-trans isomerism?

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