Chapter 22, Problem 66A

Interpretation Introduction

(a)

Interpretation:

The structure of given HFAs needs to be determined.

1, 1, 1, 2, 3, 3, 3-heptafluoropropane.

Concept introduction:

The organic compounds generally contain carbon atoms. The naming of organic compounds is done by considering three main terms which are prefix, suffix and the root name. The longest chain in the compound is first identified and named that will be the root name for the compound. For example, if there are 3 carbon atoms in the longest chain, the root name will be “prop”. To determine the suffix, functional group should be identified. For example, alcohol group will have suffix −ol, aldehyde will have suffix −al. If there is no functional group the suffix will be −ane. In the last step, side groups are identified and named. Prefix is used to give number of side groups and substituent’s present on the main carbon chain.

Explanation of Solution

The given name of hydrofluoroalkane is 1, 1, 1, 2, 3, 3, 3-heptafluoropropane. According to the name there are 3 carbon atoms in the main chain and there are 7 fluorine groups attached to it at different positions.

There are 3 fluorine groups at 1^st position, 1 at 2^nd position and 3 at 3^rd position. Thus, the structure of compound is as follows:

Interpretation Introduction

(b)

Interpretation:

The structure of given HFAs needs to be determined.

1, 1, 1, 2-tetrafluoroethane

Concept introduction:

The organic compounds generally contain carbon atoms. The naming of organic compounds is done by considering three main terms which are prefix, suffix and the root name. The longest chain in the compound is first identified and named that will be the root name for the compound. For example, if there are 3 carbon atoms in the longest chain, the root name will be “prop”. To determine the suffix, functional group should be identified. For example, alcohol group will have suffix −ol, aldehyde will have suffix −al. If there is no functional group the suffix will be −ane. In the last step, side groups are identified and named. Prefix is used to give number of side groups and substituent’s present on the main carbon chain.

Explanation of Solution

The given name is 1, 1, 1, 2-tetrafluoroethane. According to the name, there are 2 carbon atoms in the chain. Also, there are fluorine groups at different positions.

There are 3 fluorine groups at 1^st position and 1 fluorine group at 2^nd position. The structure of the compound will be: