Ответы на вопрос:
1)clch2-ch2cl+2koh=c2h2+2kcl+2h2o
2)3c2h2=c6h6
3)c6h6+cl2=c6h5cl+hcl
c6h5cl+2na+cl-ch2-ch3=c6h5-ch2-ch3+2nacl
c6h5-ch2-ch3+kmno4+h2so4=c6h5-cooh+k2so4+mnso4+h2o
c6h5-cooh+br2=c6h4br-cooh+hbr
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