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A c ompound 'X' is a weak acid and it exhibits colour change at pH close to the equivalence point during neutralization of NaOH with CH 3 COOH. Compound 'X' exists in ionized form in basic medium. The compound 'X' is :

1. methyl orange
2. methyl red
3. phen olphthalein
4. erichrome Black T

Correct answer: phen olphthalein

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