A) \[\overset{\text{O-}}{\mathop{C}}\,\equiv N,R{{S}^{\text{O-}}}\]
B) \[{}_{\bullet }^{\bullet }{{C}^{\text{O-}}},AlC{{l}_{3}}\]
C) \[B{{r}_{2}},ZnC{{l}_{2}}\]
D) \[\overset{\text{O-}}{\mathop{R}}\,\overset{\oplus }{\mathop{M}}\,gX,{{H}^{\oplus }}\]
Correct Answer: A
Solution :
Nucleophilic species are electron rich. They attack on electron deficient part of reactant. They may be negative charged on neutral. Example \[R{{S}^{\text{O-}}},C{{N}^{\text{O-}}},O{{H}^{\text{O-}}},{{R}^{\text{O-}}},C{{l}^{\text{O-}}},{{H}^{\text{O-}}},RN{{H}_{2}},{{H}_{2}}\underset{\bullet \,\bullet }{\overset{\bullet \,\bullet }{\mathop{O}}}\,,\] \[R-O-R,R-OH\]etc.
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