d,
C2H6+ 7/2 O2 $\buildrel{{t^o}}\over\longrightarrow$ 2CO2+ 3H2O
C3H8+ 5O2 $\buildrel{{t^o}}\over\longrightarrow$ 3CO2+ 4H2O
e,
CnH2n+2 + (3n+1)/2 O2 $\buildrel{{t^o}}\over\longrightarrow$ nCO2+ (n+1)H2O
=> nCO2 = n.n ankan
nH2O = (n+1).n ankan
=> n ankan= $\frac{1}{n}$nCO2= $\frac{1}{n+1}$nH2O