1: H2SO4 / H2O 2: HCl 3: (i) (reduction), (ii) sulfur (heating) View Scheme

<b>Multi-step reaction with 2 steps<br /> </b>1: Na / ethanol<br />2: (i) KOH, (ii) (decarboxylation)<br /> <br /> &nbsp;

&nbsp;(i) Zn-Hg, aq. HCl, (ii) EtOH, H₂SO₄, (iii) KOH;&nbsp;&nbsp;Multistep reaction;&nbsp;<br /> &nbsp;

<b>Multi-step reaction with 2 steps<br /> </b>1: (i) AlCl₃, (ii) /BRN= 1718733/, HCl<br />2: (i) Zn-Hg, aq. HCl, (ii) EtOH, H₂SO₄, (iii) KOH<br /> <br /> &nbsp;