Name the reagents used in the following reactions:
(i) Nitration of phenol to 2,4,6-trinitrophenol.
(ii) Butanal to butanol.
(iii) Friedel Craft’s acetylation of anisole.
(iv) Oxidation of primary alcohol to aldehyde.
(i) Phenol in presence of concentrated nitric acid and sulphuric acid gives 2,4,6-trinitrophenol.
(ii) Sodium borohydride (NaBH4) in presence of ethanol is a selective reducing agent for ketones and aldehydes. It selectively reduces carbonyl compound to alcohol.
(iii) Anhydrous AlCl3 and acyloxy chloride(RCOCl)
AlCl3 is a Lewis acid which accepts Cl- from RCOCl to give AlCl4- and RCO+ which easily undergoes electrophilic substitution reaction with anisole.
(iv) Sodium or potassium dichromate in presence of dilute sulphuric acid oxidises primary alcohol to aldehyde.
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