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Byju's Answer
Standard X
Chemistry
Position Isomerism
First, you na...
Question

First, you name both the compounds. Yes, both of them have the same name. Yet, are they really the same structure, or they are somehow different? Careful inspection should convince you that they are indeed different. Now, how their physical and chemical properties differ? Generally,
i) Cis-isomer has more dipole moment than trans-isomer.
ii) Cis is less stable than trans.
iii) The boiling points of cis isomers are more than those of trans isomers (remember boiling points are directly related to polarity which is determined by dipole moment).
iv) Chemical reactivities of cis and trans also differ from each other.
Which of the following statements best explain(s) the relationship between two isomers of CH3−CH=CH−CH3?

25928_265cf4c033384d4b8597d9ef99a8588e.png

A
They are diastereomers.
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B
They are enantiomers.
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C
They are geometrical isomers.
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D
Their melting points are same.
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Solution

The correct options are
A They are diastereomers.
C They are geometrical isomers.
- Geometrical isomerism is possible.
- But these are not the mirror images.
So, they are diastereomers.
60493_25928_ans_3fafdb1f5d434ce98c34bcd21b596af2.png

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Q.

First, you name both the compounds. Yes, both of them have the same name. Yet, are they really the same structure, or they are somehow different? Careful inspection should convince you that they are indeed different. Now, how their physical and chemical properties differ? Generally,
i) Cis-isomer has more dipole moment than trans-isomer.
ii) Cis is less stable than trans.
iii) The boiling points of cis isomers are more than those of trans isomers (remember boiling points are directly related to polarity which is determined by dipole moment).
iv) Chemical reactivities of cis and trans also differ from each other.

Which of the following compounds exhibit geometrical isomerism?

(A) CH2−CH=CH3
(B) CH3−CH=CH−CH3
(C) CH3−CH=C=CH−CH3
(D) CH3−CH=C=C=CH−CH3

25934_5c4f9a50477649e989e66947a997f8b0.png
Q. First, you name both the compounds. Yes, both of them have the same name. Yet, are they really the same structure, or they are somehow different? Careful inspection should convince you that they are indeed different. Now, how their physical and chemical properties differ? Generally,
i) Cis-isomer has more dipole moment than trans-isomer.
ii) Cis is less stable than trans.
iii) The boiling points of cis isomers are more than those of trans isomers (remember boiling points are directly related to polarity which is determined by dipole moment).
iv) Chemical reactivities of cis and trans also differ from each other.

Arrange the following compounds in the increasing order of their boiling points.

(A) CH3−CH=CH−CH3(cis)
(B) CH3−CH=CH−CH3(trans)
(C) CH3−CH=CHCl(cis)
(D) CH3−CH=CHCl(trans)

25931_9370ef7ce29d489e8b356c1da5fca242.png
Q. First, you name both the compounds. Yes, both of them have the same name. Yet, are they really the same structure, or they are somehow different? Careful inspection should convince you that they are indeed different. Now, how their physical and chemical properties differ? Generally,
i) Cis-isomer has more dipole moment than trans-isomer.
ii) Cis is less stable than trans.
iii) The boiling points of cis isomers are more than those of trans isomers (remember boiling points are directly related to polarity which is determined by dipole moment).
iv) Chemical reactivities of cis and trans also differ from each other.
The number of diastereomeric pairs and enantiomeric pairs respectively, in the set of stereoisomers of the compound CHCl=CH−CH(CH3)C2H5 are :
25937_7c7938dd3d55426a96360579ee9e9c46.png
Q. What is dipole moment? Why do cis-trans isomers have different boiling point?
Q. Why boiling point of cis isomer is greater than trans isomer?
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