Explain what lattice energy is and how it affects the properties of ionic compounds. describe the general properties of ionic compounds

Lattice energy is a way to measure the bond strength in ionic compounds.

Ionic compounds tend to have high melting and boiling points.

Ionic compounds tend to be hard.

Ionic compounds have a range of solubilities.

Ionic compounds are not conductors in the solid state, but they are good conductors as liquids or in solution.

away from the curb

explanation:

the wheels would then hit the curb if it started to rolling, decreasing the chance of an accident.

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.