Howthe followingconversions are effected ? (i) Phenol toSalicylaldehyd – InterviewSolution

1.	Howthe followingconversions are effected ? (i) Phenol toSalicylaldehyde (ii) Phenol tophenolphthalein (iii)glycolto1,4 dioxane
Answer» Solution :(i) Riemer Tiemann Reaction :On treatingphenol with ` CHCI_(3)/ NaOH, a - CHO_(3)`GROUP is introducedat orthoposition . This reaction proceedsthroughthe formation of substituted benzeal chlorideintermediate ` (##SUR_CHE_XII_V02_QP_E01_039_S01.png" width="80%"> (II) Phthalein reaction : On HEATING phenolwith phthalicanhydrideis presence of con. ` H_(2)SO_(4)`phenolphtaleinis obtained (iii) When distilledwith Conc. ` H_(2)SO_(4)` glycol FORME dioxane (##SUR_CHE_XII_V02_QP_E01_039_S03.png" width="80%">

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