what is the stability order of Li2, H2, B2

By MOT ,
B.O of Li2 is 1
B.O of H2 is 1 
B.O of B2 is also 1
so for stability order u need to see the no of electrons in antibonding orbitals
more the no of those electrons less will b da stability
so order will be H2 > Li2 >B2 

H2>LI2>B2

BASED  ON  MOLECULAR  ORBBITAL  THEORY

ALL HAVE BOND ORDER 1

The order will be H2 > B2 > Li2...since these 3 have bond order equal to 1... hence here comparing MO diagram would not work... So inorder to compare them their bond length can be compared which is Li2 > B2> H2...since bond strenth is inversely proportional to bond strength The correct order of stability will be H2 > B2 > Li2