`CH_(3)CH_(2)CONH_(2)underset(Br_(2))overset(NaOH)rarrA`
Aqueous solution of A

Options

A. Turns blue litmus to red
B. Turns red litmus to blue
C. Does not affect the litmus
D. Decolourise the litmus

Answer

To solve the question regarding the reaction of CH₃CH₂CONH₂ with Br₂ in the presence of NaOH, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reaction**: The reaction involves CH₃CH₂CONH₂ (an amide) reacting with bromine (Br₂) in the presence of sodium hydroxide (NaOH). This is known as the Hofmann bromamide reaction.

2. **Understanding the Hofmann Bromamide Reaction**: In this reaction, the amide is converted into a primary amine. The bromine reacts with the amide to form an N-bromoamide intermediate, which then undergoes hydrolysis in the presence of NaOH.

3. **Formation of the N-bromoamide**: The first step of the reaction is the formation of N-bromoamide:
\[ CH₃CH₂CONH₂ + Br₂ \xrightarrow{NaOH} CH₃CH₂C(=O)NHBr \]
Here, the bromine adds to the nitrogen of the amide, forming an N-bromoamide.

4. **Hydrolysis of N-bromoamide**: The N-bromoamide then undergoes hydrolysis in the presence of NaOH, leading to the formation of a primary amine and the release of HBr:
\[ CH₃CH₂C(=O)NHBr + NaOH \rightarrow CH₃CH₂NH₂ + NaBr + H₂O \]
In this step, the N-bromoamide is converted into the primary amine (ethylamine).

5. **Determine the Nature of the Product**: The product formed, CH₃CH₂NH₂ (ethylamine), is a basic compound. Amines generally exhibit basic properties due to the presence of a lone pair of electrons on the nitrogen atom, which can accept protons (H⁺).

6. **Aqueous Solution of A**: When ethylamine is dissolved in water, it can accept a proton from water, forming ethylammonium ion (CH₃CH₂NH₃⁺) and hydroxide ions (OH⁻):
\[ CH₃CH₂NH₂ + H₂O \rightleftharpoons CH₃CH₂NH₃^+ + OH^- \]
This reaction indicates that the solution is basic.

7. **Conclusion**: Since the solution of A (ethylamine) is basic, it will turn red litmus paper blue, confirming its basic nature.

### Final Answer:
The aqueous solution of A (CH₃CH₂NH₂) is basic and will turn red litmus blue.