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Byju's Answer
Standard XII
Chemistry
State (Phase) of Alkanes
First, you na...
Question


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?

(A) CH2−CH=CH3
(B) CH3−CH=CH−CH3
(C) CH3−CH=C=CH−CH3
(D) CH3−CH=C=C=CH−CH3

25934_5c4f9a50477649e989e66947a997f8b0.png

A
B, D
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B
B, C, D
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C
B, C
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D
A, C
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Solution

The correct option is A B, D
The compounds (B) and (D) exhibit geometrical isomerism.
As they contain different groups attached to each C atom joined by double bond.
In compound A, geometrical isomerism is not possible as two same H atoms are attached to C atom joined by double bond.
In compound C, geometrical isomerism is not possible as the molecule is non planar.
375406_25934_ans_6e2bd58342854c489877918e9694b437.png

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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.

Arrange the following compounds in the increasing order of their boiling points.

(A) CH3−CH=CH−CH3(cis)
(B) CH3−CH=CH−CH3(trans)
(C) CH3−CH=CHCl(cis)
(D) CH3−CH=CHCl(trans)

25931_9370ef7ce29d489e8b356c1da5fca242.png
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 CH3−CH=CH−CH3?
25928_265cf4c033384d4b8597d9ef99a8588e.png
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 CHCl=CH−CH(CH3)C2H5 are :
25937_7c7938dd3d55426a96360579ee9e9c46.png
Q. CH3−CH2−CH2−CH3 and CH3−CH=CH−CH3 are they constitutional isomers or not?
Q.
Which of the following is/are correctly matched?
Compound Number of geometric isomer
a. CH3−CH=CH−CH=CH−C2H5 4
b. CH3−(CH=CH)4−CH3 2
c. H2C=CH−CH=CH2 24+21=10
d. CH3−(CH=CH)5−CH3 24+22=20

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