According to the two reactions below; 1-chloro-2,2-dimethylbatune + (warm NaOH 3)) 1-chloro-2-methylpropane + (cold dil.NaOH)

Question

1) identify whether the reactions are Nucleophilic Substitutions (SN) or Elimination (E) reaction.

2) Complete the reaction mechanismin each and name the products.

3) i) rate expression for both ii) predict what will happen if concentration of base is halved iii) simultaneouslydoubling and quadrupling the concentration of alkyl halide (RX) and the base (Nu) respectively.

Please need explanation regarding this question it is very complex and google isn't really helpfull