The equation for the reaction between Al(s) and Pb+2(aq) is: 2Al(s) + 3Pb+2(aq) 2Al+3(aq) + 3Pb(s)

You know that 0.011 moles of Al(s) have been consumed and that 0.017 moles of Pb(s) have been formed. Calculate [Pb+2].

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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.

you need to stop taking that class