Question

Functional group present in sulphonic acid is :

• A. SO₄H
• B. SO₃H
• C.

  

• D. -SO₂

Answer 1

The Correct Option is B

The question asks about the functional group present in sulphonic acid. Let's analyze the given options:

1. Option SO₄H: The formula SO₄H is not a standard representation of any known functional group in organic chemistry. It is not the functional group for sulphonic acids.
2. Option SO₃H: This is the correct representation of the functional group present in sulphonic acids. The sulphonic acid group is denoted by -SO₃H, which consists of a sulfur atom bonded to three oxygens and a hydrogen atom. The structure looks like: \(\text{-}SO_3H\).
3. Option -SO₂: This represents the sulfone group, which consists of a sulfur atom double-bonded to two oxygen atoms. This is not the same as the sulphonic acid group.
4. Option with image: For illustration purposes, let's assume that the image is another incorrect representation of the sulphonic acid functional group. Without seeing the image, we can't specifically identify it, but the key focus is on the correct formula.

Thus, the correct functional group present in sulphonic acids is \(\text{-}SO_3H\), which matches the option SO₃H. This functional group is characteristic of sulphonic acids, where the sulphur has complete octet conformation through its bonding with oxygen and hydrogen atoms.

Answer 2

The functional group present in sulphonic acids is as follows:

Group present in sulphonic acids.