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Phenolphthalein is an indicator for acid-base titration, it exists as

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Phenolphthalein is an indicator for acid-base titration, it exists as

(a) benzenoid form in acid and quinonoid form in basic solution

(b) quinonoid form in acid and benzenoid form in basic solution

(c) quinonoid form in both

(d) benzenoid form in both

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1 Answer

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Best answer

Correct Option (a) benzenoid form in acid and quinonoid form in basic solution

Explanation:

Phenolphthalein is colourless in acid solution (benzenoid form) and pink in alkali (basic) solution (quinonoid form).

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