Write the structure of the Grignard reagent formed from each of the following compounds on...

Write the structure of the Grignard reagent formed from each of the following compounds on reaction with magnesium in diethyl ether:

(a) p-Bromofluorobenzene

(b) Allyl chloride

(c) Iodocyclobutane

(d) 1-Bromocyclohexene

Sample Solution (a) Of the two halogen substituents on the aromatic ring, bromine reacts much faster than fluorine with magnesium. Therefore, fluorine is left intact on the ring, but the carbon-bromine bond is converted to a carbon-magnesium bond.