According to VSEPR theory, the repulsive interaction of electron pairs decrease in the order
1
Lone pair - Bond pair > Bond pair - Bond pair > Lone pair - Lone pair
2
Lone pair - Lone pair > Lone pair - Bond pair > Bond pair - Bond pair
3
Bond pair - Bond pair > Lone pair - Lone pair > Lone pair - Bond pair
4
Lone pair - Lone pair > Bond pair - Bond pair > Lone pair - Bond pair