Question $2($I need full working solution please! Already wasted few chances, if you dont know the answer please just skip! T$\_$T$)$

A permanent load of $2k\frac{N}{m^2}$ and an imposed load of $4k\frac{N}{m^2}$ are acting uniformly over the floor area shown in Figure Q$2.$ The main beam CDEF are NOT laterally restrained, except at the end supports and at the connections D and E$.$ Select an appropriate S$355$ UB section for the main beam CDEF. Neglect the self$-$weight of the beam and check the following:

Moment and shear at ultimate limit state;

Lateral torsional buckling at ultimate limit state;

Deflection at serviceability limit state.

rigure $QL$ : A tloor pian.