Among the following the correct statement(s) is (are): 

All carbon atoms of -CH₃ groups do not lie in the same plane in ${\mathrm{Al}}_2{\left({\mathrm{CH}}_3\right)}_6$

${\mathrm{AlCl}}_3$can act as lewis acid in both monomer and dimer form

Bridging $H_b-B-H_b$ bond is stronger than terminal $B-H_t$ bond in diborane

Maximum six hydrogen atoms lie in the same plane in diborane