We have discussed a three theories of bonding: Lewis Theory, Vespr, and Valence Bond Theory. Which of the following is a strength of Valence Bond Theory? A. This theory enables us to describe the formation of covalent bonds as a result of the overlap of hybrid orbitals. B. This theory enables us to predict the shape of covalent molecules. C. This theory enables us to make predictions about bond strength and bond length. D. This theory enables us to accurately predict the magnetic properties of molecules and ions.

a

Explanation:

> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.

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.