1a) Expose 1,1-dichloropentane to the action of an excess of an alcoholic solution of alkali. The resulting compound is treated with metallic sodium and then with 2-iodopropane. To act on the final product of the reaction with water in the presence of mercury (Kucherov's reaction). Write the equations of the ongoing reactions and name the resulting substances.
b) Write the reaction equation for the polymerization of 2-methyl-1,3-butadiene.

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