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Organic And Biological Chemistry

7th Edition
STOKER + 1 other
ISBN: 9781305081079

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Chapter
Section
BuyFindarrow_forward

Organic And Biological Chemistry

7th Edition
STOKER + 1 other
ISBN: 9781305081079
Textbook Problem

The alkene Chapter 2.6, Problem 3QQ, The alkene is in a. a cis configuration b. a trans configuration c. both a cis and a trans is in

  1. a. a cis configuration
  2. b. a trans configuration
  3. c. both a cis and a trans configuration
  4. d. no correct response

Interpretation Introduction

Interpretation:

Configuration of the given alkene has to be identified from the given options.

Concept Introduction:

Alkenes are hydrocarbons that contain at least one double bond in it.  There will not be any free rotation of the double bond in alkene.  Hence, cis‑trans isomerism is possible.  The first and foremost condition for the alkene to exhibit cis‑trans isomerism is that the carbon attached in either end of double bond must have different groups attached to it.

A cis isomer is the one in which the same groups are present on same side of both the carbon atoms present in the double bond.

A trans isomer is the one in which the same groups are present on opposite side of both the carbon atoms present in the double bond.

Cis‑trans isomerism is not possible if any one of the carbon atom bonded to the double bond bears two identical groups.

Cis‑trans isomers are not constitutional isomers but they are stereoisomers.

Explanation

Reason for correct option:

Given alkene structure is,

On seeing the structure of the alkene given above, it is found that two methyl groups are present on same side of the double bond.

Therefore, the given alkene has cis configuration across the double bond.

The correct option is option (a)...

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