(a) Write the reaction of `RCOOH` with `conc.H_2 OS_4` forming two possible cations.
(b) Give the relative stabilities of the cations.

Explanation

### Step-by-Step Solution:

**(a)** To write the reaction of a carboxylic acid (RCOOH) with concentrated sulfuric acid (H₂SO₄), we need to consider the protonation of the carboxylic acid.

1. **Protonation of the Carbonyl Oxygen:**
- The carbonyl oxygen (C=O) in the carboxylic acid can accept a proton (H⁺) from the concentrated sulfuric acid. This leads to the formation of a cation:
\[
RCOOH + H_2SO_4 \rightarrow RCO^+OH_2
...