$HC \equiv CH\,\xrightarrow[{H{g^{2 + }}}]{{{H_2}S{O_4}}}\,'P'$
નીપજ $'P'$ કઈ મળશે નહીં...
$C{H_3}C \equiv CH\xrightarrow[{(ii)\,Dl}]{{(i)\,DCl\,\,(1\,equiv)}}$