Question

Why there is no pi bond in ethoxyethane

Answer 1

Diethyl Ether (CH3-CH2-O-CH2-CH3) has: 

2 SP3 at the CH3 (3 bonds to hydrogens and one bond to a carbon) 
2 SP3 at the CH2 (it is bonded to a carbon, oxygen and hydrogens) 
SP3 at the O (two lone pairs and two bonds to carbonds) 

All of the bonds are sigma bonds.