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Br2, AlBr3

Cl2, AlCl3

HNO3, H2SO4

HNO3, H2SO4/Fe or Zn, HCl, NaOH

Fuming H2SO4

How to turn back into benzene?
Dilute H2SO4

CH3Cl, AlCl3

CH3, AlCl3/Excess NBS

CH3Cl, AlCl3/KMnO4, H2O, heat, H3O+

acyl group + Cl, AlCl3

acyl group + Cl, AlCl3/Zn(Hg), HCl, heat

strong activator, ortho-para

moderate activator, ortho-para

weak deactivator, meta

weak activator, ortho-para

moderate deactivator, meta

strong deactivator, meta

H2O/H+ or OH-

1eq ROH/H+

2eq. ROH/H+

CH3CH2Mg/H3O+

HCN

CH3CH2(-)+P(Ph)3

SH(CH2)2SH

NaBH4/EtOH

LiAlH/H3O+

CH(-)/H3O+

CO2

Mg

H3O+

H2O, HCl/heat

(-)CN

NaBH4

HCl, H2O

CO2

Mg, (CH3CH2)2O