C2H5OH --> CH2=CH2 + H2O реакция дегидратации
1)CaC2+ 2 H2O=Ca(OH)2+C2H2
2) 3 C2H2=C6H6
3) C6H6+3 H2=C6H12
4) C6H12=C6H6+3 H2
5)C6H6+CH3Cl=C6H5CH3+HCl
6)С6Н6 + Br2= C6H5Br + HBr.
7)
С6Н6+HNO3--->C6H5NO2+Н2О
8)C6H5NO2 + 3 Н2 → C6H5NH2 + 2 Н2О.
<span><span>а) C + K2Cr2O7 + H2SO4 -> CO2 + Cr2(SO4)3 + K2SO4+ H2O
3 <span>C0</span></span> + <span>2 <span>K2Cr2VIO7</span></span> + <span>8 <span>H2SO4</span></span> → <span>3 <span>CIVO2</span></span> + <span>2 <span>Cr2III<span>(SO4)</span>3</span></span> + <span>2 <span>K2SO4</span></span> + <span>8 <span>H2O</span></span></span><span>C0</span> - <span>4e-</span> → <span>CIV</span><span>CrVI</span> + <span>3e-</span> → <span>CrIII</span>
Для водорода верный вариант 1)O2 N2 CuO
O2+2H2=2H2O
N2+3H2=2NH3