Question

Zwitter ion can be formed by:
A.Acetanilide
B.Benzanilide
C.Sulphanilic acid
D.Benzene sulphonamide

Answer 1

To answer this question, you must recall the structure of a Zwitterion. Zwitterion is a dipolar ion which is formed on the combination of a carboxyl group and an amino group. As a result, it is mostly formed by an amino acid. The carboxyl group in a zwitterion carries a negative charge while the amine group carries a positive charge.

Complete answer:
We know that a molecule consisting of both positively charged and negatively charged ions in it is known as a zwitterion. The number of positively charged functional groups in a zwitterion is equal to the number of negatively charged functional groups. Thus, we can say that electrical neutrality is maintained within the molecule. Due to the presence of both positive and negative charges, they are known as dipolar ions.
Thus, we can say that to form a Zwitterion a molecule must have an acidic group and a basic group. Of all the given compounds, only sulphanilic acid fulfills both the requirements. Sulphanilic acid contains a sulfonic acid group and an amino group. The sulfonate group is deprotonated forming an anion and the amino group is protonated forming a cation giving rise to a dipolar zwitterion.
Sulphanilic acid is a crystalline, off- white colored solid. It is generally used in the production of food dye and various pharmaceutical products.

Thus, the correct answer is C.

Note:
Amino acids in aqueous solutions, generally form zwitterions. The acidic carboxyl group loses a proton gaining a negative charge. This proton is accepted by the basic amino group making it positively charged and overall forming a dipolar ion.