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Chiral Centres and Chirality

Which of the ...

Question

Which of the following statements is not true regarding the cis and trans isomers of an alkene?

A

They are configurational isomers.

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B

They are diastereomers.

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C

The cis-isomer has higher dipole moment than the trans-isomer.

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D

The cis isomer usually has a lower boiling point than the trans-isomer.

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Solution

The correct option is D The cis isomer usually has a lower boiling point than the trans-isomer.
Trans has no (or very less) dipole moment than cis isomer.
Cis isomer has more dipole moment than trans isomer, because it has two similar groups on same side of double bond. So the dipole gets added, and hence cis isomer is more polar than trans. While trans is more symmetric in nature, so it can be more closely packed. So, it has a higher melting point.
Due to more polar nature, it has more B.P than trans.

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Similar questions

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.
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. 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.

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. Which of the following statements is not true about the complex ion

[P t (e n)_{2} C l_{2}]^{2 +}

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