The question stem and all four options are missing in the prompt, so there is no chemistry problem to solve.

1. Given data check

   • Subject: Chemistry
   • Topic: Organic Chemistry
   • Sub-topic: Aldehydes, Ketones and Carboxylic Acids
   • Type: MCQ
   • Question: missing
   • Options A, B, C, D: all missing
   • Stored correct answer: $\text{B}$

2. Why I cannot solve it To evaluate an MCQ, I need:

   • the full question statement, and
   • the content of options A–D.

   Without these, no chemical reasoning or option analysis is possible.

3. About comparison with stored answer Since the actual question and options are absent, I cannot independently derive whether option $\text{B}$ is correct.

4. What is needed Please provide the full question text and the four options so I can solve it step-by-step and verify whether the stored answer $\text{B}$ is correct.