An organic compound contains 78 \% (by wt.) carbon and remaining percentage of hydrogen. The right option for the empirical formula of this compound is : [Atomic wt. of C is 12, H is 1]
(1) \mathrm{CH}
(2) \mathrm{CH}_{2}
(3) \mathrm{CH}_{3}
(4) \mathrm{CH}_{4}