Which is true of the reactants in this displacement reaction? fe + 2hcl fecl2 + h2a. the reactants are located to the left of the arrow in the chemical equationb. the reactants contain 1 iron atom, 2 hydrogen atoms, and 1 chlorine atom. c. the reactants are the atoms, molecules, or compounds formed in the reaction. d. the reactants have the same physical and chemical properties as the products.

Option (A) is the correct answer.

Explanation:

A displacement reaction is defined as a reaction in which an element reacts with a compound and an element of the compound is displaced by another element.

For example,

In this reaction, there are one Fe atom, 2 hydrogen and 2 chlorine atoms on the reactant side.

Since, it is a chemical reaction therefore, properties of both reactants and products will be different.

Species present on the left side of arrow are reactants and on the right side of arrow depicts products.

Thus, we can conclude that the statement reactants are located to the left of the arrow in the chemical equation, is true.

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.  

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.