| (I) \[p-N{{O}_{2}}-{{C}_{6}}{{H}_{4}}{{\overset{\oplus }{\mathop{N}}\,}_{2}}\] |
| (II) \[p-Cl-{{C}_{6}}{{H}_{4}}{{\overset{\oplus }{\mathop{N}}\,}_{2}}\] |
| (III) \[{{C}_{6}}{{H}_{5}}{{\overset{\oplus }{\mathop{N}}\,}_{2}}\] |
| (IV) \[p-Me-{{C}_{6}}{{H}_{4}}{{\overset{\oplus }{\mathop{N}}\,}_{2}}\] |
A) I>II>III>I
B) IV>III>II>I
C) II>I>IV>III
D) III>IV>I>II
Correct Answer: A
Solution :
[a]The more EWG is diazonium ion, the faster the coupling is. (1) \[(I)>(II)>(III)>(IV)\] \[(I)\Rightarrow \] (\[p-N{{O}_{2}},-I\] and \[-R\]), \[(II)\Rightarrow (p-Cl,-I)\] \[(III)\Rightarrow \] Standard \[(IV)\Rightarrow \](\[p-Me,\,+I,\] and Hyper conjugation),
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