A new C−C bond formation is possible in:
A new carbon-carbon bond formation is possible in
One of the following does not happen during a chemical reaction. This is :
(a) Breaking of old chemical bonds and formation of new chemical bonds
(b) Formation of new substances with entirely different properties
(c) Atoms of one element change into those of another element to form new products.
(d) A rearrangement of atoms takes place to form new products.