Question 13 of 25
2 points
what is the relationship between chemicals and cancer?
o
a. there is no treatment available for cancer caused by chemicals.
b. more chemists have died from cancer than from any other cause.
c. some chemicals cause cancer, whereas others have been
designed to fight it.
o
d. chemists have a greater chance of getting cancer than the rest of
us.

C. Some chemicals cause cancer, whereas others have been

designed to fight it.

Explanation: Exposure to casinogens can lead to cancer this are chemicals also some chemicals(drugs) have been developed to combat the effect of cancerous cells. Hence the relationship between cancer and chemicals

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.