______ is a phenolic factor present in onion which has anti-fungal properties.

✅Explanation:
-Catechol is a phenolic compound found in onions that exhibits antifungal properties.
-It contributes to the onion's natural defense mechanisms against fungal pathogens.
-Research has shown that catechol can inhibit the growth of various fungi, making it a potentially valuable compound for developing natural antifungal agents.

🛑Other Options Explanations:
-Option A (Quercetin): Quercetin is another phenolic compound present in onions, known for its antioxidant and anti-inflammatory properties. While it might have some indirect effects on fungal growth,
-Option C (Sinigrin): Sinigrin is a glucosinolate compound responsible for the pungent flavor of onions and other cruciferous vegetables. It breaks down into compounds with potential health benefits.
-Option D (Allyl propyl disulphide): This compound contributes to the characteristic odor of onions.