15) Solution : Expected larger front der Waal,s a betwixt the forthcoming couples:
a. Clorobenzene has senior front der Waal,s a than benzene as the chlorobenzene comprise C-Cl polar chain.
b. Chlorine atom has senior front der Waal,s a than H2 as the magnitude of Cl2 is senior than H2
c. CH3CH2OH has senior front der Waal,s a than CH3-O-CH3 .Ethanol comprises OH bunch for hydrogen chaining.
d.Ar has greater front der Waal,s a than He. As the magnitude increases the polarizability too increases. Thus
accordingly of senior magnitude of Ar than He. front der Waal,s a is senior.
e. NH3 has greater front der Waal,s a than CH4. This is accordingly of uninhabited couple of electrons on nitrogen intermolecular forces are presenrt & it can too frame hydrogen chain with other atom.
f.(CH3)2NH has greater front der Waal,s a than N(CH3)3 .The dimethyl amine has interactions through the hydrogen attached to nitrogen.