When carbohydrates are oxidized, the c–h bonds of the carbohydrate become c=o bonds of carbon dioxide. oxidation is defined as a loss of electrons, but carbon does not become positively charged in the process. why then is this considered oxidation?

Answer : Here,when the carbohydrates undergo oxidation the C-H bonds break and make new C=O bonds because of the shared electrons which are in C-O bonds spends less time being close to the carbon nucleus than the shared electrons in C-H bonds,.

l dont know l am s sorry

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.