A complex is wrltten as M(en)y.xBr. lts 0.05 molar solution shows 2.46 atm osmotlc pressure at 27°C. Assuming 100 % ionisaton and coordination number of metal (iii) is six, complex may be:

The Complex is M(en)y.xBr. and given c= 0.05 M, osmotlc pressure = 2.46 atm and The= 300K.

We know that osmotlc pressure (π)= icRT

Where To is universal gas constant = 0.0821j/mole per K

Then I = π/ cRT = 2.46/0.05×0.0821×300

                           =2 

  The vant Hoff facter's is (2) means their is two ions furnish after dissociation of Complex since  coordination number is (6) and van't hoff facter is (2) then formula of Complex is :

[M(en)2Br2]Br --> [M(en)2Br2]+  +Br-