Question

what is the common name of ch3(ch2)2 - o - (ch2)2ch3? propyl propyl ether dipropyl ether dibutyl ether butyl butyl ether butyl propyl ether

Explanation:

The compound has two propyl ($CH_3(CH_2)_2 -$) groups attached to an oxygen atom. In naming ethers, when two identical alkyl groups are present, we use the prefix "di -". So it's dipropyl ether.

Answer:

B. dipropyl ether