(i) A substance A (a mild non-corrosive base) used in cooking when heated gives another powder B.
(ii) When powder A is mixed with a mild edible acid, it libreates a gas C.
(iii) When powder B is recrystallised, it gives another powder D having detergent properties.
Identify A, B C and D.
Write the equation for the conversion taken place.

Two moles of organic compound 'A' on teratment with a strong base give two compounds 'B' and 'C'. Compound 'B' on dehydrogenation with Cu gives 'A' while acidification of 'C' yield carboxylic acid 'D' with molecular formula of CH_2O_2 . Identify the compounds A, B, C and D. Write all chemical reactions involved.

An organic compound (A) on treatment with acetic acid in presence of sulphuric acid pro-duces as ester(B). (A) on mild oxidation gives (C). (C) with 50% KOH followed by acidifica-tion with dill HCI generates (A) and (D). (D) with PCI_5 followed by reaction with ammonia give (E). (E) on dehydration produces HCN-acid. Identify A to E.

An organic compound A on treatment with ethanol yields a carboxylic acid B and a neutral compound C.On hydrolysis, C produces B and another compound D. D on oxidation produces B, which on heating with Ca (OH)_2 gives E (C_3H_6O) E form 2,4 Dinitrophenyl hydrazone derivatives but does not show Fehling test.

An organic compound 'A' having molecular formula C_6H_6O gives a characteristic colour with aqeuous FeCI_3 solution. When 'A' is treated with CO_2 and NaOH at 400K under pressure 'B' is obtained. The compound B on acidification gives compound C which react with acetyl chloride to form D which is a popular pain killer. Deduce the structure of A, B, C and D.

An unknown aldehyde 'A' on reacting with alkali gives a beta hydroxy aldehyde, which losses water to form an unsaturated aldehyde, but-2-enal. Another aldehyde 'B' undergoes disproportionation reaction in the presence of conc alkali to form products 'C' and 'D'. 'C' is an aryl alcohol with formula C_7H_8O : Name the product, when 'B' reacts with zinc amalgam and hydrochloric acid.