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Tautomerism

Why boiling p...

Question

Why boiling point of cis isomer is greater than trans isomer?

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Solution

The difference in the boiling point betweencisandtransisomers arises due to presence of polar bonds incisisomer.

Incisisomers there are dipole-dipole forces which add to the London dispersion forces (A weak inter-molecular force arising from polarization) and raise the boiling point, while in the case oftransisomers the net dipole moment is zero that’s whytransisomers have lower boiling point thancisisomers.

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

Q. Which one of the following reason is responsible for lower melting point of cis isomer than trans-isomer?

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.

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)

Q. Why is the boiling point of cis isomers higher?

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