What is the symbol for molarity?

m
M
g
l

The answer to your question is M

Explanation:

Concentration is represented in a lot of units like Molarity, molality, normality, mass percent, etc.

These units consider the moles or grams of the solute and the volume of the solvent.

Molarity measures the number of moles of solute per liter of solvent and is represented with a letter M (uppercase).

i don,t know so just answer mine

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.