20CC of hydro carbon were exploded with excess of oxygen. After explosion and cooling a contraction of 20cc was noted on addition of KOH another contraction of 40CC was noted. The molecular formula of hydrocarbon is

20CC of hydro carbon were exploded with excess of oxygen. After explos

1.	20CC of hydro carbon were exploded with excess of oxygen. After explosion and cooling a contraction of 20cc was noted on addition of KOH another contraction of 40CC was noted. The molecular formula of hydrocarbon is
Answer» `C_(2)H_(6)` `C_(2)H_(4)` `C_(2)H_(2)` `CH_(4)` Solution :Let formula of hydrocarbon = CXHY `CxHY+(X+(y)/(4))O_(2)rarrxCO_(2)+(y)/(2)H_(2)O` `{:("1 mol",(x+(y)/(4))"mol","x mol"),("1 vol",(x+y//4)"vol","x vol"),(20C C,20(x+(y)/(4))C C,20xC C):}` `CO_(2)` PRODUCED = contraction on addition of KOH = 40 CC implies 20x = 40 implies x = 2 `[20C C+20(x+(y)/(4))C C]-20xC C=30C C` `y=2` Formula of hydrocarbon =`C_(2)H_(2)`