Chemical responsible for pungent smell and tear inducing property in onion is

Options

A. Alicin
B. Sinigrin
C. Diallyl sulfide
D. Santonin

Answer

To answer the question regarding the chemical responsible for the pungent smell and tear-inducing property in onions, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Options**: The question provides several options to choose from, which include:
- Allicin
- Sinigrin
- Diallyl Sulphide
- Santonin

2. **Evaluate Allicin**:
- Allicin is a compound found in garlic, which belongs to the Allium family.
- Since the question specifically asks about onions, which are also in the Allium family, we need to check if allicin is the correct answer for onions.
- However, allicin is not primarily responsible for the pungent smell and tear-inducing properties of onions.
- **Conclusion**: Allicin is incorrect for this question.

**Hint**: Consider the specific family of plants and the compounds they are known for.

3. **Evaluate Sinigrin**:
- Sinigrin is a compound found in plants of the Brassicaceae family, such as broccoli and black mustard.
- It is not associated with onions, which belong to the Allium family.
- **Conclusion**: Sinigrin is also incorrect.

**Hint**: Check the family of the plant associated with each chemical.

4. **Evaluate Diallyl Sulphide**:
- Diallyl sulphide is a compound found in Allium plants, including onions (scientifically known as Allium cepa).
- This compound is known for its pungent smell and is responsible for the tear-inducing properties when onions are cut.
- **Conclusion**: Diallyl sulphide is the correct answer.

**Hint**: Look for the chemical that is specifically linked to the properties mentioned in the question.

5. **Evaluate Santonin**:
- Santonin is a drug used for deworming and is not related to the properties of onions.
- **Conclusion**: Santonin is incorrect.

**Hint**: Consider the function and use of each chemical to determine its relevance to the question.

### Final Answer:
The chemical responsible for the pungent smell and tear-inducing property in onions is **Diallyl Sulphide**.