How many sigma and pi bonds are present in
(a) `CH_(3)-C-=N`
(b) `CH_(2)=C=O`

Explanation

To determine the number of sigma (σ) and pi (π) bonds in the given compounds, we can analyze each structure step by step.

### (a) For `CH₃-C≡N`:

1. **Identify the structure**: The compound consists of a carbon (C) atom bonded to three hydrogen (H) atoms (methyl group, CH₃) and connected to another carbon (C) atom which is triple-bonded to a nitrogen (N) atom.

2. **Count the sigma bonds**:
- The CH₃ group has three C-H bonds, which are all sigma bonds.
...