Sound travels faster through solids than it does through either liquids or gases a student could verify this statement by

Put a watch on table and hear it ticking, it will be faint. Next keep your ears on the table, you can hear more clear ticking. If you put a watch in water then you wont be able to hear it as well even if you put your ear on the glass.

Explanation:

58750.08068 is the answer i think

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.