The formula of a gaseous hydrocarbon which requires 6 times of its own volume of O2​ for complete oxidation and produces 4 times its own volume of CO2​ is Cx​Hy​. The value of y is :
​Cx​Hy​( g)+(x+4y​)O2​( g)→xCO2​( g)+2y​H2​O(I)x+4y​=6x=4y=8​