Question
Which is most stable conformer of ethan $-1,2-$ diol

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[Note : Ignore the pairing energy]
$C{H_3}C{H_2}COOH\xrightarrow{{PC{l_3}}}I\xrightarrow[{AlC{l_3}}]{{{C_6}{H_6}}}II\xrightarrow[{base,heat}]{{N{H_2}N{H_2}}}III$ is

