A weather balloon was launched from a research station at Anderson Air Force Base on the island of Guam (standard pressure). When the balloon was launched, the temperature
was 24 °C and the volume of the balloon was 14.8 m2. At an altitude of 11 000 meters,
the volume of the balloon had increased to 50.0 m and the temperature had dropped to
-56 °C. What was the pressure in atmospheres of the balloon at that altitude?

sure im new too!

explanation:

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.