Study the reaction. CH4 + 2O2 → CO2 + 2H2O

If 4.0 moles of methane (CH4) and 8.0 moles of oxygen (O2) enter this reaction, how many moles of carbon dioxide (CO2) and water (H2O) will be created at the end of the reaction?

4 moles of carbon dioxide and 8 moles of water
4 moles of carbon dioxide and 4 moles of water
8 moles of carbon dioxide and 4 moles of water
1 mole of carbon dioxide and 4 moles of water

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.

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