1.

An organic compound (A) of molecular formula C_(3)H_(8)O_(2) is obtained as by-product in the manufacture of soap. Compound (A) on heating with P_(2)O_(5) gives an unsaturated compound (B) of molecular formula C_(3)H_(4)O. Compound (A) with well cooled mixture of Conc. H_(2)SO_(4) and fuming HNO_(3) form compound ( C) which is an explosive. Identify A, B and C and explain the reaction.

Answer»

Solution :(i) Compound (A) with MOLECULAR formula `C_(3)H_(8)O_(3)` is GLYCEROL.
(ii) Glycerol on heating with `P_(2)O_(5)` gives an unsaturated compound (B).
`underset((A))underset(CH_(2)OH)underset(|)overset(CH_(2)OH)overset(|)(CHOH) overset(P_(2)O_(7))underset(DELTA) to underset("unstable")underset(CHOH)underset(||)overset(CH_(2))overset(||)C to underset((B))underset(CHO) underset(|)overset(CH_(2))overset(||)CH`
(iii) Glycerol with cooled mixture of conc. `H_(2)SO_(4)` and fuming `HNO_(3)` form compound (C).
`underset((A))underset(CH_(2)OH)underset(|)overset(CH_(2)OH)overset(|)(CHOH) + 3HNO_(3) overset("conc" H_(2)SO_(4)) to underset((C))underset(CH_(2)ONO_(2))underset(|)overset(CH_(2)ONO_(2))overset(|)(CHONO_(2)) + 3H_(2)O`


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