Write down the following reaction giving example and equation :

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(a) Iodoform (Haloform) reaction: Acetaldehyde or methyl ketone reacts with iodine in presence of alkali to form yellow coloured iodoform. This reaction is known as the iodoform test. (b) Tischenko reaction: Two molecules of benzaldehyde is coupled together in presence of aluminium ethoxide or isopropoxide then benzyl benzoate (ester) is formed. (c) Gattermann-Koch synthesis: Mixture of CO and HCl bubbled through a solution of aromatic hydrocarbon in ether solution in the presence of anhydrous AlCl3, then benzaldehyde is formed. (d) Rosenmund’s reaction: Aldehydes are obtained by the reduction of the acid chloride with hydrogen in boiling xylene in presence of a catalyst Pd suspended in BaSO 4 . This reaction is called the Rosenmund reaction

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