Consider following compounds.
(a) Number of compounds which are aromatic (x).
(b) Number of compounds which can evolve H2 gas on reaction with Na metal (y).
#(c) Number of compounds which can evolve CO2 gas on reaction with NaHCO3 (z).
[If answer is x,y & z respectively, then fill 0xyz in sheet]
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Aromatic compounds follow Hückel's rule (4n+2 π-electrons in a cyclic conjugated system). Compounds with -OH or -COOH groups can evolve H2 with Na metal, while only carboxylic acids (-COOH) evolve CO2 with NaHCO3.
Analyzing the structures: (I) is aromatic (6π), (II) non-aromatic, (III) aromatic (6π), (IV) aromatic (6π), (V) non-aromatic. So x=3. For H2 with Na: (I) phenol, (III) carboxylic acid, (IV) alcohol, (V) carboxylic acid → y=4. For CO2 with NaHCO3: only carboxylic acids (III) and (V) → z=2.
Final answer: 0342