Jahnvi made paste of two food items X and Y each and put them in two test tubes. She added dilute iodine solution to food item X, while copper sulphate solution and caustic soda to food item Y. She observes that X turned blue-black and Y turned purple.
Which of the following is incorrect regarding this?

Options

A. Y is a protein rich food.
B. X is a protein rich food.
C. X is a starch rich food.
D. Both A and C.

Explanation

To solve the question step by step, we need to analyze the information provided about the food items X and Y and the tests performed on them.

### Step 1: Understand the Tests Conducted
- Jahnvi added dilute iodine solution to food item X.
- She added copper sulphate solution and caustic soda to food item Y.

### Step 2: Analyze the Results
- Food item X turned blue-black after adding iodine solution.
- This indicates the presence of starch, as iodine turns blue-black in the presence of starch.

- Food item Y turned purple after adding copper sulphate and caustic soda.
- This indicates the presence of proteins, as the biuret test (which uses copper sulphate) turns purple in the presence of proteins.

### Step 3: Identify the Nature of Food Items
- From the results:
- Food item X is starch-rich (since it turned blue-black).
- Food item Y is protein-rich (since it turned purple).

### Step 4: Evaluate the Statements
Now, we need to evaluate the statements given in the question:
1. Y is protein-rich food. (This is correct.)
2. X is protein-rich food. (This is incorrect; X is starch-rich.)
3. X is starch-rich food. (This is correct.)
4. Both A and C. (This is correct since both A and C are true.)

### Conclusion
The incorrect statement regarding the food items is:
- **B: X is protein-rich food.**

### Final Answer
The answer is that the incorrect statement is **B**.

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