21.完成下列反应式。-|||-(1) -(H)_(2)=C(H)_(2) () dfrac ({Cl)_(2)}({h)_(2)} () dfrac ({C)_(6)(H)_(6)}(Al{Cl)_(3)} ()合-|||-(2) -C(H)_(3)xrightarrow [(H)_(2)S(O)_(4)](NH{O)_(3)} () dfrac ({Br)_(2)}(Fe) () dfrac ({Cl)_(2)}({h)_(2)} () (H)_(3)C=CNa () Lindlar Pd ()=-|||-(3) -CH3→(H2SO4 () dfrac (2{{H)_(2)}^2}({Fe)^2} () xrightarrow [Delta ]({{H)_(3)O}^+} () Na2Cr2O7 ()-|||-CH3-|||-(4) AlCl3,100℃ () xrightarrow [HFe(O)_(2)](C{H)_(2)=C(H)_(2)} (HF)_(2)(O)^-C () -间二甲苯 ()-|||-CH3-|||-(5) -C(H)_(3)xrightarrow [Delta ]({(C{H)_(3))}_(3)CCl} ()-|||- -C6H5COCl () -AlCl3 ()