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Q.
In alkaline hydrolysis of a tertiary alkyl halide by aqueous alkali, if concentration of alkali is doubled, then the reaction rate at constant temperature
In alkaline hydrolysis of tertiary halide by aqueous alkali, if concentration of alkali is doubled, then the reaction will remain constant because t-alkyl halides with aqueous alkali give $S_{N} 1$ reaction and the rate of $S_{N} 1$ reaction is not based upon the concentration of nucleophile (i.e., alkali).