c
Combustion \(rx ^{ n }:\)

\(C _{ x } H _{ y ( g )}+\left( x +\frac{ y }{4}\right) O _{2}( g ) \rightarrow x CO _{2}( g )+\frac{ y }{2} H _{2} O (\ell)\)

\(V\,\quad\quad\quad\quad\quad6V\quad\quad\quad\quad\quad\quad-\)

\(-\,\quad\quad\quad\quad\quad-\quad\quad\quad\quad\quad Vx=4V\)

\(\Rightarrow x=4\)

Sinc: \((I)\) \(Vo _{2}=6 \times V _{ c _{ x } H _{y}}\)

\(\Rightarrow V \left( x +\frac{ y }{4}\right)=6 V\)

\(\left.\Rightarrow\left( x +\frac{ y }{4}\right)=6\right] \Rightarrow 4+\frac{ y }{4}=6\)

\(\Rightarrow y =8\)