Who proposed the Law of Multiple Proportions?

Which of the following pairs of compounds demonstrates the law of multiple proportions?

Match the laws given in List-$A$ with the scientists who discovered them in List-$B$.

List-$A$	List-$B$
$(1)$ Law of Multiple Proportions	$(A)$ Dalton
$(2)$ Law of Conservation of Mass	$(B)$ Joseph Proust
$(3)$ Law of Definite Proportions	$(C)$ Lavoisier
	$(D)$ Hofmann

$n_1 \ g$ of substance $X$ reacts with $n_2 \ g$ of substance $Y$ to form $m_1 \ g$ of substance $R$ and $m_2 \ g$ of substance $S$. The reaction is represented as $X + Y \rightarrow R + S$. What is the relationship between the mass of the reactants and the mass of the products?

Two elements $X$ and $Y$ have atomic weights of $14$ and $16$. They form a series of compounds $A, B, C, D$ and $E$ in which for the same amount of element $X$,the amounts of $Y$ are present in the ratio $1 : 2 : 3 : 4 : 5$. If the compound $A$ has $28$ parts by weight of $X$ and $16$ parts by weight of $Y$,then the compound $C$ will have $28$ parts by weight of $X$ and:

Under the same conditions of temperature and pressure,equal volumes of different gases contain an equal number of......