Phenol is heated with phthalic anhydride in presence of conc. $H_{2} S O_{4}$ . The product gives pink colour with alkali. The product is:

phenolphthalein

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Solution

The correct option is C phenolphthalein
Phenol is heated with phthalic anhydride in presence of conc. $H_{2} S O_{4}$ . The product gives a pink colour with alkali. The product is phenolphthalein. In acidic medium phenolphthalein is colourless. It is used as an indicator of acid-base titration.

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Similar questions

Q. A mixture of phenol and phthalic anhydride when heated with conc.

H_{2} S O_{4}

forms ........................which is used as an indicator in acid-base titrations.

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Q. An organic compound (A) of molecular formula

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gives violet colour with neutral ferric chloride. Compound (A) when heated with zinc dust gives a hydrocarbon (B). Also compound (A) reacts with phthalic anhydride and conc.

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. Identify (A), (B) and (C). Explain the reactions.

Toluene on heating with succinic anhydride in the presence of anhydrous followed by reduction with Zn - Hg/Con. HCl gives a product which on heating with thionyl chloride followed by heating with anhydrous $A l C l_{3}$ in $C S_{2}$ gives major product (A), so, the product (A) is:

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Phenol is heated with phthalic anhydride in presence of conc. H2SO4. The product gives pink colour with alkali. The product is:

The correct option is C phenolphthaleinPhenol is heated with phthalic anhydride in presence of conc. H2SO4. The product gives a pink colour with alkali. The product is phenolphthalein. In acidic medium phenolphthalein is colourless. It is used as an indicator of acid-base titration.

Phenol is heated with phthalic anhydride in presence of conc. $H_{2} S O_{4}$ . The product gives pink colour with alkali. The product is:

The correct option is C phenolphthalein
Phenol is heated with phthalic anhydride in presence of conc. $H_{2} S O_{4}$ . The product gives a pink colour with alkali. The product is phenolphthalein. In acidic medium phenolphthalein is colourless. It is used as an indicator of acid-base titration.