What is the major organic product labeled "Z" in the following reaction sequence?
"CH3CH2CH2CH2OH + NaOH -> CH3CH2CH2CH2O- + Na+
CH3CH2CH2CH2O- + CH3CH2CH2CH2Br -> CH3CH2CH2CH2OCH2CH2CH2CH3 + Br-
CH3CH2CH2CH2OCH2CH2CH2CH3 + HCl -> CH3CH2CH2CH2OH + Cl-
heat
2
EtOH
OEt
OH
OEt
OH
OEt
IV)