Which one of the following phenols does not give colour when condensed with phthalic anhydride in presence of conc. H2SO4? fuEu esa ls dkSu lk QhukWy jax ugha nsrk gS tc] lkUnz H2SO4 dh mifLFkfr esa m

Question

Which one of the following phenols does not give colour when condensed with phthalic anhydride in presence of conc. H2SO4? fuEu esa ls dkSu lk QhukWy jax ugha nsrk gS tc] lkUnz H2SO4 dh mifLFkfr esa mls FkSfyd ,ugkbMªkbM ds lkFk la?kfur djrs gSa\

(A) OH OH
(B) OH OH
(C) OH CH3
(D) OH

Prashant Kotian · Accepted Answer

Correct answer: C. O O || || O + OH NaOH SO H 2      O O || OH HO Pink colour (derivative of phenolphthalein) Phenol and its derivatives react at para position with phthalic anhydride. In p-cresol para position is blocked. So reaction not possible.

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