Question

A compound ‘A’ (C₇H₈O) is insoluble in NaHCO₃ solution but dissolve in NaOH and give a characteristic colour with neutral FeCl₃ solution. When treated with Bromine water compound ‘A’ forms the compound B with the formula C₇H₅OBr₃. ‘A’ is

• A.
• B.
• C.
• D.

Answer 1

The Correct Option is B

We can deduce the structure of compound 'A' from the given reactions and properties:

1. Compound 'A' is insoluble in NaHCO₃ solution, which suggests that it is not an acid, so it is not a carboxylic acid.
2. Compound 'A' dissolves in NaOH, which indicates that it is an alcohol (phenol or an alcohol). Since phenols are generally soluble in NaOH and alcohols are also soluble, we must further investigate.
3. Compound 'A' gives a characteristic colour with neutral FeCl₃ solution, which is a test for phenols. This reaction forms a coloured complex with phenolic compounds, indicating that 'A' is likely a phenol or an alcohol that can react in this way.
4. Compound 'A' reacts with Bromine water to form a compound B with the formula C₇H₅OBr, which suggests that 'A' undergoes bromination, typical of alcohols (especially phenols) and the resulting product is a bromo derivative. 

Based on these reactions, the correct compound 'A' is phenol (C₆H₅OH), and it undergoes bromination in the presence of bromine water to form a bromo derivative.

The correct answer is (B) : .