2. Ethylene glycol is used as antifreeze to automobile engines because it mixes with water in all proportions and does not freeze under usual winter conditions. Why does it mix so well with water?
3. A student had an unknown water soluble alcohol. It gave a blue-green color with chromic acid, a precipitate in the iodoform test, and a precipitate with Lucas reagent, but only after heating for 15 min. Below are the structures of three alcohols. Circle which one would fit the tests that the student carried out? Explain your choice.
$CH_3CH_2CH_2CH_2OH$
$CH_3-CH-CH_2-CH_3$
$|OH$
$CH_3- \underset{CH_3}{\overset{OH}{|}C}-CH_3$