Give the chemical reactions for the following conversions:
$(1)$ Glyoxal from acetylene
$(2)$ Glycol from bromoethane

(N/A) $(1)$ Conversion of acetylene to glyoxal:
$3CH \equiv CH \xrightarrow{\text{Red hot Fe tube, } 873 \ K} C_6H_6 \text{ (Benzene)}$
$C_6H_6 \xrightarrow[(ii) Zn, H_2O]{(i) O_3} 3CHO-CHO \text{ (Glyoxal)}$
$(2)$ Conversion of bromoethane to glycol:
$CH_3CH_2Br \xrightarrow{\text{alc. KOH, } \Delta} CH_2=CH_2 \text{ (Ethene)}$
$CH_2=CH_2 \xrightarrow{\text{dil. } KMnO_4, 273 \ K} CH_2(OH)-CH_2(OH) \text{ (Ethane-1,2-diol or Glycol)}$