JEE Main 2018 — Some Basic Concepts Of Chemistry Question with Solution

$$\therefore$$ The ratio of no of atoms of C and H in one molecule of C_x H_y O_z = 1 : 2

$$\therefore$$ y = 2x

In one molecule of C_x H_y O_z compound contain z atoms of oxygen.

According to the question, no of atoms of oxygen required to burn C_xH_y completely should be twice of z atoms of oxygen.

C_xH_y + (x + $$\frac{y}{4}$$) O₂ $$\to$$ HCO₂ + $$\frac{y}{2}$$ H₂O

No. of O₂ molecules required = (x + $$\frac{y}{4}$$)

$$\therefore$$ No. of O atoms required = 2 (x + $$\frac{y}{4}$$)

According to question,

$$2\left(x+\frac{y}{4}\right)=2z$$

$$\Rightarrow 2\left(x+\frac{2x}{4}\right)=2z$$ [ Putting y = 2x ]

$$\Rightarrow \frac{3x}{2}=z$$

$$\therefore$$ x : y : z

= x : 2x : $$\frac{3x}{2}$$

= 2 : 4 : 3

$$\therefore$$ Empirical formula = C₂H₄O₃