In the following questions, a statement of assertion (A) is followed by a statement of reason (R )
A : Equal number of sigma and `pi` bonds are present in ethyne.
R : `pi` Bond is stronger than `sigma` bond.

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
C. If Assertion is true statement but Reason is false, then mark (3)
D. If both Assertion and Reason are false statements , then mark (4).

Answer

To solve the question regarding the assertion and reason statements about ethyne, we will analyze both statements step by step.

### Step 1: Analyze the Assertion (A)
**Assertion (A): Equal number of sigma and pi bonds are present in ethyne.**

1. **Identify the structure of ethyne (C₂H₂)**: Ethyne, also known as acetylene, has a molecular formula of C₂H₂.
2. **Determine the bonding**: Ethyne has a triple bond between the two carbon atoms and single bonds between carbon and hydrogen.
3. **Count the bonds**:
- The triple bond consists of:
- 1 sigma bond
- 2 pi bonds
- Each carbon atom is also bonded to one hydrogen atom through a sigma bond.
- Therefore, the total number of sigma bonds in ethyne is:
- 1 (from the C≡C bond) + 2 (one from each C-H bond) = 3 sigma bonds.
- The total number of pi bonds is 2 (from the C≡C bond).
4. **Conclusion**: Ethyne has 3 sigma bonds and 2 pi bonds, which means the assertion that there are equal numbers of sigma and pi bonds is **false**.

### Step 2: Analyze the Reason (R)
**Reason (R): Pi bond is stronger than sigma bond.**

1. **Understand the nature of sigma and pi bonds**:
- Sigma (σ) bonds are formed by the head-on or axial overlap of atomic orbitals, which allows for a strong bond due to effective overlap.
- Pi (π) bonds are formed by the sideways or lateral overlap of p-orbitals, which is generally weaker than sigma bonds due to less effective overlap.
2. **Conclusion**: Since sigma bonds are stronger than pi bonds, the reason that pi bond is stronger than sigma bond is also **false**.

### Final Conclusion
Both the assertion (A) and the reason (R) are false.

### Summary of the Answer
- Assertion (A) is false: Ethyne has 3 sigma bonds and 2 pi bonds.
- Reason (R) is false: Sigma bonds are stronger than pi bonds.