Identify what reagents you would use to achieve each transformation: (a) Conversion of 2-methyl-2-butene into a secondary alkyl halide (b) Conversion of 2-methyl-2-butene into a tertiary alkyl halide (c) Conversion of cis-2-butene into a meso diol (d) Conversion of cis-2-butene into enantiomeric diols