Two liquids of different temperatures are separated by a barrier. The hot liquid is on the right side and the cold one is on the left side. Which statement describes how the molecules move in heat flow? Molecules from the left collide and transfer heat to the barrier, which transfers heat to the right side. Molecules from the right collide and transfer heat to the barrier, which transfers heat to the left side. Molecules from the right collide and transfer heat directly to the right side. Molecules from the left collide and transfer heat directly to the right side.

in chemistry, a solution’s concentration is how much of a dissolvable substance, known as a solute, is mixed with another substance, called the solvent. the standard formula is c = m/v, where c is the concentration, m is the mass of the solute dissolved, and v is the total volume

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.