1) C6H12=C6H6+3H2
2)C6H6+Cl2=C6H5Cl+HCl
3)C6H5Cl +2Na +C2H5-Cl = C6H5-C2H5 +2NaCl
4)5C6H5-C2H5 +6 KMnO4+9H2SO4 =5 C6H5-COOH +3K2SO4+6MnSO4+14H2O
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<span> Al2o3 Al2(+3) o3(-2)</span>
<span><span>Li2Se Li2(+1) Se(-2)</span></span>
<span><span><span>Mgbr2 Mg(+2) Br2(-1)</span></span></span>
<span><span><span><span>SF6 S(+6) F6(-1)</span></span></span></span>
<span><span><span><span><span>HRO3 H(+1) R(+5) O3(-2)</span></span></span></span></span>
<span><span><span><span><span><span>H2CO3 H2(+1) C(+4) O3(-2)</span></span></span></span></span></span>
<span><span><span><span><span><span><span>KNO3 K(+1) N(+5) O3(-2)</span></span></span></span></span></span></span>
1-б
2-г
3-г
4-а
Все просто. Удачи тебе)