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14Which of the following structures can exist as cis-trans isomers?CH2CH2CH2CH-CHCH2CH2CHI.п. СН,CH,CH,CH,CH,CH,CH-CH,IV. CHCHCH2CH-CH2CH2CH2CHП. СН.CH,CH-СНCH-CH,CH,CH,(A) I and II(B) I and IV(E) I alone(C) I and III(D) II and III

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14
Which of the following structures can exist as cis-trans isomers?
CH2CH2CH2CH-CHCH2CH2CH
I.
п. СН,CH,CH,CH,CH,CH,CH-CH,
IV. CHCHCH2CH-CH2CH2CH2CH
П. СН.CH,CH-СНCH-CH,CH,CH,
(A) I and II
(B) I and IV
(E) I alone
(C) I and III
(D) II and III
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14 Which of the following structures can exist as cis-trans isomers? CH2CH2CH2CH-CHCH2CH2CH I. п. СН,CH,CH,CH,CH,CH,CH-CH, IV. CHCHCH2CH-CH2CH2CH2CH П. СН.CH,CH-СНCH-CH,CH,CH, (A) I and II (B) I and IV (E) I alone (C) I and III (D) II and III

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Step 1

Geometrical isomerism:

Geometric isomerism is a form of isomerism in which two substances have the same composition and structure but differ in relative special positions of the groups.

In the cis isomer, the two groups under consideration are on the same side of the double bond (cis means on the same side in Latin).

In the trans isomer, the two groups under consideration are on opposite sides of the double bond (trans means across in Latin).

Step 2

Cis and Trans isomers of (I):

H
НаС-Cн2 CH2
CH2 CH2 CH3
Нас CH2 CH2
C C
H
CH2-CH2 CHз
Cis
Н
Trans
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H НаС-Cн2 CH2 CH2 CH2 CH3 Нас CH2 CH2 C C H CH2-CH2 CHз Cis Н Trans

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Step 3

Structure of (II):

Doesn`t exhibit ...

Н
CH2 CHCH2-CH2CH2 CH 3
Н
Н
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Н CH2 CHCH2-CH2CH2 CH 3 Н Н www.

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