Which one of the following is a trihydric phenol?

مندرجہ ذیل میں سے کون سا ٹرائی ہائیڈرک فینول ہے؟

Pyrogallol

Phenol

Resorcinol

None of these

Pyrogallol is a trihydric phenol as it contains three hydroxyl (-OH) groups attached to a benzene ring.

It is commonly used in photographic development.

It is used as a reagent in chemical reactions.