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Reactions of HALOALKANES: Q:1 Reagent Time taken for Reaction (at room temperature) (Minutes) Time taken for Reaction (at 30.C) (Minutes) Precipitate Colour 1-chlorobutane 7.41 4.53 White precipitates 1-bromobutane 5.23 1.46 Pale cream precipitates 1-iodobutane 0.10 0.07 Yellow precipitates Looking at the electronegativity values, Cl has the highest of three which is 3. Br has intermediate electronegativity value of 2.8 while electronegativity value of iodine is smallest of three which is 2.5. Therefore the difference in electronegativity in the C-Cl bond is greatest. Also the reason being Cl the smallest of the three halogens. C-Cl bond is the strongest of three because of greater attractive forces between Carbon and Chlorine. Bromine is bigger in size than Chlorine and has smaller electronegativity value as compared with chlorine. Therefore C-Br bond is of intermediate strength, whereas C-I bond is the weakest of the three due to the fact that size of I is greatest of three. Because of that the shared pair of electron between C-I experiences less attraction as compared to in C-Br...

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