In the organic compound `CH_(2) = CH – CH_(2) – CH_(2) – C equivCH`, the pair of hydridised orbitals involved in the formation of: `C_(2) – C_(3)` bond is:
`(a) sp – sp_(2) (b) sp – sp_(3) (c) sp_(2 )– sp_(3) (d) sp_(3) – sp_(3)`

Explanation

To determine the hybridization of the carbon atoms involved in the formation of the C2-C3 bond in the compound `CH2=CH-CH2-CH2-C≡CH`, we can follow these steps:

### Step 1: Identify the Structure
The given compound can be represented as:
```
H H H H
| | | |
H--C==C--C--C--C≡C--H
...