Question:
Which A gives red colour in the reaction
\[
A \xrightarrow[(ii)\ \mathrm{NaOH}]{(i)\ \mathrm{HNO_2}} \text{red colour}
\]
Which A gives red colour in the reaction
\[
A \xrightarrow[(ii)\ \mathrm{NaOH}]{(i)\ \mathrm{HNO_2}} \text{red colour}
\]
Show Hint
Only primary nitroalkanes give red colour with \(\mathrm{HNO_2}\) followed by alkali.
Updated On: Apr 23, 2026
- A
- B
- C
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1: Formula / Definition}
\[ \text{Primary nitroalkane} + \mathrm{HNO_2} \rightarrow \text{Nitrolic acid} \xrightarrow{\mathrm{NaOH}} \text{red colour} \]
Step 2: Calculation / Simplification}
Option (A) represents a primary nitroalkane.
Primary nitro compounds react with \(\mathrm{HNO_2}\) to form nitrolic acids, which give red colour in alkaline medium.
Step 3: Final Answer
\[ \text{Structure in option (A)} \]
\[ \text{Primary nitroalkane} + \mathrm{HNO_2} \rightarrow \text{Nitrolic acid} \xrightarrow{\mathrm{NaOH}} \text{red colour} \]
Step 2: Calculation / Simplification}
Option (A) represents a primary nitroalkane.
Primary nitro compounds react with \(\mathrm{HNO_2}\) to form nitrolic acids, which give red colour in alkaline medium.
Step 3: Final Answer
\[ \text{Structure in option (A)} \]
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