Chapter 17, Problem 17.67UTC

Interpretation Introduction

(a)

Interpretation:

The given IUPAC name of citronellal should be completed.

Concept Introduction:

The group that contains carboxyl group which is attached to at least one hydrogen is said to be an aldehyde group, general representation of an aldehyde group is RCH=O or RCHO.

In order to give the name to the aldehyde group, the following steps are followed:

1. The parent (longest) alkane chain is identified.

2. The ending of the parent chain from alkane (-e) is changed to -al for an aldehyde group. The carbonyl group of an aldehyde appear at the end of the carbon chain so, the numbering starts with carbon having aldehyde group.

3. Name should be written in alphabetical order and other substituents are shown by the number.

For number of carbons atoms chain, the prefix is given as:

Carbon-1  meth

Carbon-2  eth

Carbon-3  prop

Carbon-4  but

Carbon-5  pent

Carbon-6  hex

Carbon-7  hept

Carbon-8  oct

Carbon-9  non

Carbon-10  dec

Interpretation Introduction

(b)

Interpretation:

The significance of en in octenal should be determined.

Concept Introduction:

A group of atoms due to which a particular compound is responsible for the characteristic reactions is said to be functional group.

Interpretation Introduction

(c)

Interpretation:

The significance of al in octenal should be determined.

Concept Introduction:

A group of atoms due to which a particular compound is responsible for the characteristic reactions is said to be functional group.