Question

IUPAC name of \[N{H_2} - C{H_2} - C{H_2} - C{H_2} - COOH\] ?
A.4-amino butanoic acid
B.1-amino 4- butanoic acid
C.4-amino 2- butanoic acid
D.1-amino 2- butanoic acid

Answer 1

Hint: IUPAC name is defined by the number of carbon in the chain. In the molecular chain of carbon, first count the atoms of carbon in molecules and give the name according to the number of carbon. Then IUPAC name will be defined by the group which is attached in the branch of chain. There are some rules for IUPAC nomenclature. The nomenclature should be defined by the rules of this nomenclature.

Complete step by step answer:
IUPAC name is defined by the counting number of carbon atoms. There are different names given by the numbers of C- atoms. If the molecule contains one Carbon known as Methen, if there are two carbons known as Ethen.
Here, the chain of carbon contains four carbons which is known as buten. There are two groups attached with the chain of carbon.
First group is amine and the second group is carboxylic acid. Here first carbon contains carboxylic group because carboxylic group has highest priority among carbon containing functional group and then amine group will be considered.
The molecular formula is given as below:
                       4 3 2 1
                \[N{H_2} - C{H_2} - C{H_2} - C{H_2} - COOH\]
Here we see that the four carbons are in this formula which contains carboxylic group and amine group.
So due to highest priority carboxylic acid takes first place an amine attached with the fourth carbon.
So, the nomenclature of this molecular formula is 4-amino butanoic acid.

Hence, the correct answer is option (A).

Additional information:
The full form of IUPAC is the International union of pure and applied chemistry. It was invented by Friedrich August Kekule von strandonitz.

Note:
IUPAC name is the international method for the nomenclature of organic compounds. It is used for organic compounds. This method depends on the chain of carbon atoms and the group attached with the branch. Here group derived by their highest priority is the carbon functional group. There are many compounds which contain more than one group.