Viết PTHH hoàn thành sơ đồ biến đổi a. CH3OONa -> CH4 -> C2H2 -> C2H2Br4 b. C -> CH4 -> CH3Cl c. CaC2 -> C2H2 -> C2H4 ->C2H6 d. C2H5OH -> C2H4 -> C2H4

\(\begin{array}{l}
\rm{a)\quad CH_3COONa \xrightarrow{(1)} CH_4 \xrightarrow{(2)} C_2H_2 \xrightarrow{(3)} C_2H_2Br_4\\
(1)\quad CH_3COONa + NaOH \xrightarrow{t^\circ,\ CaO} CH_4\uparrow + Na_2CO_3\\
(2)\quad 2CH_4 \xrightarrow[làm\ lạnh\ nhanh]{1500^\circ} C_2H_2 + 3H_2\\
(3)\quad C_2H_2 + 2Br_2 \longrightarrow C_2H_2Br_4\\
b)\quad C \xrightarrow{(1)} CH_4 \xrightarrow{(2)} CH_3Cl\\
(1)\quad C + 2H_2 \xrightarrow{t^\circ, \ Ni} CH_4\\
(2)\quad CH_4 + Cl_2 \xrightarrow{ánh\ sáng} CH_3Cl + HCl\\
c)\quad CaC_2 \xrightarrow{(1)} C_2H_2 \xrightarrow{(2)}C_2H_4 \xrightarrow{(3)} C_2H_6\\
(1)\quad CaC_2 + 2H_2O \longrightarrow C_2H_\uparrow + Ca(OH)_2\\
(2)\quad C_2H_2 + H_2 \xrightarrow{t^\circ,\ Pd/PbCO_3} C_2H_4\\
(3)\quad C_2H_4 + H_2 \xrightarrow{t^\circ, \ Ni} C_2H_6\\
d)\quad C_2H_5OH \xrightarrow{(1)} C_2H_4 \xrightarrow{(2)} C_2H_4Br_2\\
(1)\quad C_2H_5OH \xrightarrow{170^\circ C,\ H_2SO_4} C_2H_4 +H_2O\\
(2)\quad C_2H_4 + Br_2 \longrightarrow C_2H_4Br_2
}\end{array}\)