$A$ hydrocarbon has $C = 85.72\%$ and the remaining is $H$. The hydrocarbon is:

Arrange the following compounds in the increasing order of percentage of chlorine by weight:
$I.$ $DDT$ $(C_{14}H_9Cl_5)$
$II.$ Gammaxene $(C_6H_6Cl_6)$
$III.$ Carbon tetrachloride $(CCl_4)$
$IV.$ Chlorobenzene $(C_6H_5Cl)$

$A$ hydrocarbon contains $85.7 \% C$. If $42 \, mg$ of the compound contains $3.01 \times 10^{20}$ molecules,the molecular formula of the compound will be

Actual number of atoms of different elements present in a molecule of a compound is given by

An organic compound containing $C$ and $H$ has $92.3 \%$ of carbon. Its empirical formula is:

An organic compound has an empirical formula $CH_2O$,its vapour density is $45$. The molecular formula of the compound is