Which compound exhibits only two signals in its
^(1)H
NMR spectrum, a triplet and a quintet?
BrCH_(2)CH_(2)CH_(2)Br
(CH_(3))_(2)CHOCH(CH_(3))_(2)
(CH_(3))_(2)CHCH(CH_(3))_(2)
CH_(3)CH_(2)CH_(2)CH_(3)