Pick out the wrong statement.

Packed towers are preferred for vacuum operation, because the pressure drop through the packing is less and they $($packings$)$ also lessen the possibility of tower wall collapse

Packed towers are preferred over plate towers for handling corrosive and foamy liquids

Diameter of randomly packed tower is normally more than $1\mathrm{.}2$ metres

Due to uneven supply and improper distribution of liquid, problem of channelling, loading & flooding is generally encountered in packed towers