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(i) ( CH_ 3 -CHBr-CH_ 2 Br xrightarrow Zn, Delta Q+HBr xrightarrow R_ 2 O_ 2 R ) (ii) ( RX+NH_ 3 xrightarrow a ; Ar-NO_ 2 +[H] xrightarrow Sn+HCl, Delta b ) | Suva Ai