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Geometrical Isomerism

Difference in...

Question

Difference in the physical properties of cis and trans isomer is due to :

A

the difference in the shape of the molecule

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B

the difference in the overall dipole moment of the molecule

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C

both a and b

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D

none of these

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Solution

The correct option is C both a and b
Difference in the physical properties of cis and trans isomer is due to difference in dipole moment and in arrangement of atoms i.e. difference in shape.

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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 statements best explain(s) the relationship between two isomers of

C H_{3} - C H = C H - C H_{3}

?

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

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

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.

C H_{3} - C H = C H - C H_{3} (c i s)

C H_{3} - C H = C H - C H_{3} (t r a n s)

C H_{3} - C H = C H C l (c i s)

C H_{3} - C H = C H C l (t r a n s)

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?

C H_{2} - C H = C H_{3}

C H_{3} - C H = C H - C H_{3}

C H_{3} - C H = C = C H - C H_{3}

C H_{3} - C H = C = C = C H - C H_{3}

Q. What is dipole moment? Why do cis-trans isomers have different boiling point?

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