Answer
$He, Ne, SO_{2}, NH_{3}, CH_{3}CH_{2}OH$
$He$ and $Ne$ are noble gases and are least complex. Among them, molar mass of $Ne$ is greater than that of $He$ and therefore entropy of $Ne$ is greater than that of $He$. Molecular complexity increases in the order $SO_{2}\lt NH_{3}\lt CH_{3}CH_{2}OH$. Knowing that entropy increases with increasing molecular complexity, we obtain the ranking as written above.
Work Step by Step
$He$ and $Ne$ are noble gases and are least complex. Among them, molar mass of $Ne$ is greater than that of $He$ and therefore entropy of $Ne$ is greater than that of $He$. Molecular complexity increases in the order $SO_{2}\lt NH_{3}\lt CH_{3}CH_{2}OH$. Knowing that entropy increases with increasing molecular complexity, we obtain the ranking as
$He, Ne, SO_{2}, NH_{3}, CH_{3}CH_{2}OH$
