Give reasons that might help to explain the following observations:
A student was unsuccessful to prepare a Grignard reagent from 4-bromocyclohexanol.
Benzenesulfonic acid does not undergo Friedel-Crafts alkylation.
(2S, 3R)-2,3-Dibromobutane has a specific rotation, [a]o, of 0°.
A student tries to prepare an ether via the Williamson ether synthesis from ethanol and
t-butyl bromide, but obtains an alkene instead.
Doubling the concentration of a nucleophile has no effect on the rate of a substitution