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Solve this Preparatior„ Physical propehies Of halo-alkanes and haloareneS p-dichlorobenzene has higher melting point than 0• and m- isomers. Give reason. (CBSE 2009 comptt.) (CBSE 2011) 2. Haloalkanes easily dissolve in organic solvents "Vhy ? , will you obtain 3. (a) n-propyl iodide from n-propyl bromide ? (b) bromoethane from ethanol ? (c) iodoethane from (a) ethanol, (b) ethene ? 4. hich of the following p airs have higher boil ing point? (a) I-bromopropane and 2-bromopropane? (b) 2-chlorO-2-methylpropa_ne (tert•butyl chloride) and 2-iodo•2-methylpr0pane (tert-butyl iodide)? (C) Ethyl bromide and ethyl chloride ? (d) o•dichlorobenzene and RI-dichlorobenzene? 5. What happens when, (a) ethanol is treated with phosphorus tribromide? Oethyl alcohol is warmed with iodine in the presence Of an alkali? (c) 2,2-dimethylpropane is chlorinated in the presence of UV radiation? Complete the reactions:

Dear Student,
The p-isomer of dichlorobenzene has a symmetrical structure therefore the molecules can closely pack in crystal lattice. The intermolecular forces of attraction are strong and therefore large amount of energy is required to break the bonds. Therefore the p-isomer melts at a higher temperature compared to ortho and meta isomers (having unsymmetrical and less packed crystal structure)
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