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Question
Which of the following structures represent a cis form?
Which of the following structures represent a cis form?
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Solution
The correct option is C
Geometrical Isomerism arises due to different arrangement of atoms/groups around a system where free rotation of bonds is restricted. This is also known as cis-trans isomerism.
Cis-trans configurations:
In double bonded system and cycloalkanes, when same groups present at the same side it is of cis form and if same group present at the different side then it is of trans form.
In compound (a) and (b) same groups present at the different side so they are of trans form.
Compound (d) does not show cis-trans isomerism because it has similar groups at the terminals of the restricted carbon - carbon single bond.
In compound (c), both methyl groups are present at the same side so it is cis form.
Hence, option (c) is the correct answer.
Geometrical Isomerism arises due to different arrangement of atoms/groups around a system where free rotation of bonds is restricted. This is also known as cis-trans isomerism.
Cis-trans configurations:
In double bonded system and cycloalkanes, when same groups present at the same side it is of cis form and if same group present at the different side then it is of trans form.
In compound (a) and (b) same groups present at the different side so they are of trans form.
Compound (d) does not show cis-trans isomerism because it has similar groups at the terminals of the restricted carbon - carbon single bond.
In compound (c), both methyl groups are present at the same side so it is cis form.
Hence, option (c) is the correct answer.
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