Question 16 (3 points)
unless otherwise instructed, you may refer to the periodic table in the chemistry:
problems and solutions book for this question.
which of the following elements belong to the po-block of the periodic table?
noble gases
halogens
alkaline earth metals
alkali metals

halogens and noble gases

Explanation:

group VIIA (17) of the periodic table are the halogens and group VIIIA (18) of the periodic table are the noble gases

the p-orbital block is from group 13 to group 18

h let me 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.