Chapter 14, Problem 1PP

PRACTICE PROBLEM 14.1

Provide a name for each of the following compounds.

Interpretation Introduction

Interpretation: The name is to be provided for each of the given compound.

Concept Introduction:

The substituent and the benzene ring together give a common accepted parent name.

The position is indicated by the numbers, if more than one group is present on the benzene ring.

Benzene ring with large substituents are named by treating benzene as a substituent. In such cases, benzene as a substituent is named as a phenyl group.

The benzene ring is numbered such that the substituent will get the lowest possible number.

Answer to Problem 1PP

Solution:

a) $4-\text{bromobenzoic acid}$

b) $2-\text{benzyl}-1,3-\text{cyclohexadiene}$

c) $2-\text{chloro}-2-\text{phenylpentane}$

d) Propoxybenzene

Explanation of Solution

(a)

Given information:

The compound contains a common structural unit of benzoic acid and bromine as a substituent is present at the fourth position. Thus, the name of the compound is $4-\text{bromobenzoic acid}$.

(b)

Given information:

The compound contains a simple derivative of benzene named as benzyl group. In cyclohexadiene, two double bonds are present at the first and the third position, and benzyl group is present at the second position. Hence, the name of the compound is $2-\text{benzyl}-1,3-\text{cyclohexadiene}$.

(c)

Given information:

This compound contains five carbon atoms in its longest continuous chain. The base name is pentane. The numbering is done in such a way that the substituent gets the lowest number. There are two substituents in this structure-chloro and phenyl group. Both chloro group and phenyl group are located at the second carbon atom. So, the name of the compound is $2-\text{chloro}-2-\text{phenylpentane}$.

(d)

Given information:

The given compound contains ether as a functional group. The compound is named according to the groups bonded to the ether oxygen. The group bonded to the ether oxygen is phenyl and propyl. Hence, the name of the compound is Propoxybezene.