The nearest star to the earth is Proxima Centuri. It is   from New York City. The distance to Perth on the exact other side of the globe is about . Given that , how many  further from New York is Proxima Centuri compared to Perth?
Note: An order of magnitude is an estimate of size based on how many multiples of ten something is bigger or smaller compared to something else. If I have $1 and you have $200 we can say you have 2 orders of magnitude more money than me because it is two factors of 10 larger. If you had $1,000,000 it would be 6 orders of magnitude more. For this question we don't want you to say exactly how much farther this star is, but approximate in terms of orders of magnitude.

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.