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Organic And Biological Chemistry

7th Edition
STOKER + 1 other
ISBN: 9781305081079

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Section
BuyFindarrow_forward

Organic And Biological Chemistry

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

In a ketone the carbonyl group

  1. a. is always located at the end of the carbon chain
  2. b. may be at the end of or in an interior position on the carbon chain
  3. c. is always located in an interior position on the carbon chain
  4. d. no correct response

Interpretation Introduction

Interpretation:

Where the carbonyl group is located in a ketone has to be chosen from the given options.

Concept Introduction:

Carbonyl groups are the one which contain a double bond between carbon and oxygen atom.  Aldehydes and ketones possess this carbonyl functional group in it.  The structural representation of a carbonyl group can be given as shown below,

Organic And Biological Chemistry, Chapter 4.3, Problem 2QQ

An aldehyde is a carbonyl compound in which the carbonyl carbon atom is bonded to at least one hydrogen atom directly.  The other group attached to the carbonyl carbon atom can be alkyl, cycloalkyl, or aryl group.

A ketone is a carbonyl compound in which the carbonyl carbon atom is bonded to two other carbon atoms directly.  The groups attached to the carbonyl carbon atom can be alkyl, cycloalkyl, or aryl group.

Explanation

Reason for correct option:

Carbonyl group contains a carbon atom and an oxygen atom.  The bond between carbon and oxygen in a carbonyl group is a double bond.  In case of a ketone, the carbonyl carbon atom is bonded directly to two other carbon atoms from alkyl, cycloalkyl, or aryl groups.  As this carbonyl carbon atom is bonded to two other carbon atoms, it has to be present always in an interior position on the carbon chain.  The general structural formula for ketone can be given as,

Therefore, option (c) is the correct one...

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