Question

If an element X has three allotropes A, B and C. If
heat of combustion at standard state for A, B and
Care -100, -150 and -110 kJ/mol respectively. The
correct order of stability is
(1) A > B>C
(2) B > C>A
(3) A > C >B
(4) A = B = C​

Answer 1

option 3 is correct (A>C>B)