What is the merit of using organocadmium over organomagnesium halides?

Organocadmium are less reactive than organomagnesium halides Organocadmium are more reactive than organomagnesium halides Organocadmium are more facile than organomagnesium halides Organocadmium are less facile than organomagnesium halides

Organocadmium are less reactive than organomagnesium halides

Organocadmium being less reactive than organomagnesium halides, they do not react further with ketones to form tert-alcohol. Further, they do not react with functional groups like -CN, -CO, -COOR, -NO2, etc.