part a\nidentify an ether.\nch3ch2sch2ch3\nch3ch2ph2\nch3ch2och2ch3\nch3ch2sh\nch3cooch3

Brief Explanations:

An ether has the general formula R - O - R', where R and R' are alkyl or aryl groups. Among the given options, $CH_3CH_2OCH_2CH_3$ fits this formula with $R = CH_3CH_2$ and $R'=CH_2CH_3$.

Answer:

$CH_3CH_2OCH_2CH_3$