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    Can you please explain the mechanisms + reactions and the reasons for why 1-iodobutane reacts faster than 1-bromobutane and 1-chlorobutane. Also, why 2-bromo-2-methylpropane reacts faster than 1-bromobutane and 2-bromobutane.

    The halogenoalkanes are dropped in heated ethanol. And then mixed with silver nitrate solution to form a precipitate.

    The simplest explanation is in terms of C-X bond strength.

    The weaker the bond, the faster the reaction. C-I is weaker than C-Br, is weaker than C-Cl.

    You can use bond strengths to explain branching, 1o (primary) haloalkanes have stronger bonds than 2o, which are stronger than 3o.
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