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Cis-Trans Nomenclature

Does CH 3 -...

Question

Does ${C H}_{3} - C H = N - {C H}_{3}$ shows Cis-trans isomerism? If yes give a reason for it.

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Solution

$C H_{3} = C H N - C H_{3}$ shows cis-trans isomerism as the double bond is the stereo center

The lone pair of nitrogen is responsible for stereo isomerism.

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Q: FIND WHETHER TRANS OR CIS ISOMER.

CH₂ = C (COOH)₂

ANS : CIS (in book)

but I think this compound doesn't shows isomerism

if it does , explain.

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. The Arrhenius equation for cis-trans isomerization of but-2-ene

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

and but-2-en-1-nitrite

(C H_{3} - C H = C H - C N)

k (s^{- 1}) = 10^{13.8} \times e^{(- 263.5 k J {m o l}^{- 1} / R T)}

k^{'} (s^{- 1}) = 10^{11} \times e^{(- 214.5 k J {m o l}^{- 1} / R T)}

Calculate the temperature at which

4 k = k^{'}

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. 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}

?

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