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Covalent Bond vs Ionic Bond

What is dipol...

Question

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

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Solution

a dipole refers to the separation of charges within a molecule between two covalently bonded atoms. Dipole Moment Definition: A dipole moment is a measurement of the separation of two oppositely charged charges. Dipole moments are a vector quantity. ... Molecules with a net dipole moment are polar molecules.

The bond dipole moment uses the idea of electric dipole moment to measure the polarity of a chemical bond within a molecule. It occurs whenever there is a separation of positive and negative charges.

In cis and trans compounds, most of them have same molecular mass but polarity of cis compound is more than trans compound. Because in trans, the same bonds are exactly opposite each other thus making dipole momentequals to zero but cis gives resultantdipole moment. Thus boiling point of cis is more than trans.

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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. Assertion :Cis form will always have more boiling point than trans form. Reason: Boiling point depends on dipole moment, greater the dipole moment greater the boiling point.

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 boiling point of cis isomer is greater 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.
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}

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