$12\mathrm{.}57$ Why does the antifreeze ingredient ethylene glycol

$)=(62\mathrm{.}07\frac{g}{m}ol$ have a boiling point of $197\mathrm{.}6C,$ whereas propanol $)=(60\mathrm{.}09\frac{g}{m}ol,$ a compound with a similar molar mass, has a boiling point of only $97\mathrm{.}4C?$