For samples that are difficult to deal with, such as solids of limited solubility, films, threads, pastes, adhesives, and powders, a technique known as internal- reflection spectroscopy is used for obtaining the ir spectra. refer to some external resources to find the principle of this technique. also give information about the instrument and the applications for it.

by cartels in other countries, shipped by air, mail, or land. i cant really see your answer choices : /

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.