Identify 'A' and 'B' in the following reaction :
`CH_(3)-CH=CH_(2) overset(HBr)(rarr) 'A' overset("alc. KOH")(rarr) 'B'`

Explanation

To solve the problem, we need to identify the compounds 'A' and 'B' in the given reaction:

1. **Starting Compound**: The reaction starts with propene, which is represented as CH₃-CH=CH₂.

2. **Addition of HBr**: When HBr is added to propene, it follows Markovnikov's rule. According to this rule, the hydrogen atom (H⁺) from HBr will attach to the carbon with more hydrogen atoms (the less substituted carbon), while the bromine atom (Br⁻) will attach to the carbon with fewer hydrogen atoms (the more substituted carbon).

- In propene, the carbon atoms are:
- Carbon 1 (C1) has 3 hydrogen atoms (CH₃)
...