Question -
Answer -
(a) The bond cleavage usingcurved-arrows to show the electron flow of the given reaction can berepresented as

It is an example ofhomolytic cleavage as one of the shared pair in a covalent bond goes with thebonded atom. The reaction intermediate formed is a free radical.
(b) The bond cleavageusing curved-arrows to show the electron flow of the given reaction can berepresented as

It is an example ofheterolytic cleavage as the bond breaks in such a manner that the shared pairof electrons remains with the carbon of propanone. The reaction intermediateformed is carbanion.
(c) The bond cleavageusing curved-arrows to show the electron flow of the given reaction can berepresented as

It is an example ofheterolytic cleavage as the bond breaks in such a manner that the shared pairof electrons remains with the bromine ion. The reaction intermediate formed isa carbocation.
(d) The bond cleavageusing curved-arrows to show the electron flow of the given reaction can berepresented as

It is a heterolyticcleavage as the bond breaks in such a manner that the shared pair of electronsremains with one of the fragments. The intermediate formed is a carbocation.