Consider the following reactions :

Anti-addition takes place in :

Consider the following reactions : Syn-addition takes place in :

Consider the following reactions : Syn-addition takes place in :

Consider the following reactions : Syn-addition takes place in :

Consider the following reactions : Syn-addition takes place in :

Addition reaction takes place in

Consider following reaction : (a) Number of reaction which take place via carbocation. (b) Number of reactions which take place via free radical. (C) Number of reactions which take place via carbanion. (d) Number of reactions which produce diastereomeric pair as major product.

Which of the following reactions will not take place ?