Question

IUPAC name of the second member of the homologus series of carboxylic acid ?

Answer 1

Second member of homologous series of carboxylic acid is

CH3CH2COOH

AND

its IUPAC name is Propanoic acid..

Answer 2

IUPAC name of the second member of the homologus series of carboxylic acid is propanoic acid.

Explanation:

A homologous series is a series of compounds with the same functional group and similar chemical properties in which the members of the series differ by the number of repeating units they contain.

The IUPAC nomenclature of organic compounds are given as follows:

1. Select the longest possible carbon chain.

2. For the number of carbon atom, we add prefix as 'meth' for 1, 'eth' for 2, 'prop' for 3, 'but' for 4, 'pent' for 5, 'hex' for 6, 'sept' for 7, 'oct' for 8, 'nona' for 9 and 'deca' for 10.

3. A suffix 'oic acid' is added at the end of the name if functional group is -COOH

The first member will contain two carbon atoms and it will be ethanoic acid $CH_3COOH$.The next homologue will have one more $CH_2$ and thus the molecular formula will be $CH_3CH_2COOH$ and IUPAC name will be propanoic acid.

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