Question

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Chlorophyll turns olive green during cooking of vegetables.
Reason (R): Acidic conditions convert chlorophyll to pheophytin.
Choose the correct answer from the options below:

• A. Both (A) and (R) are correct and (R) is the correct explanation of (A)
• B. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
• C. (A) is correct but (R) is not correct
• D. (A) is not correct but (R) is correct

Hint:

Green $\rightarrow$ Olive green = Chlorophyll → Pheophytin (acid effect).

Answer 1

The Correct Option is A

Concept: Chlorophyll is the green pigment in vegetables. During cooking, especially in acidic conditions, chlorophyll undergoes chemical transformation to pheophytin, which gives an olive-green color.

Step 1: Understanding chlorophyll structure.
Chlorophyll contains magnesium at its center within a porphyrin ring.

Step 2: Effect of heat and acid.
During cooking:
• Heat causes breakdown of cell structure
• Acids released from vegetables lower pH

Step 3: Chemical transformation.
In acidic conditions:
• Magnesium is replaced by hydrogen ions
• Chlorophyll converts to pheophytin
• Color changes from bright green to olive green

Step 4: Evaluating statements.
• Assertion — Correct, olive green color appears during cooking
• Reason — Correct and explains the chemical cause

Step 5: Logical connection.
The reason directly explains why chlorophyll turns olive green. Final Conclusion:
Both statements are correct and the reason explains the assertion. Hence, option (1) is correct.