Consider the following statements about othro and para-hydrogen
I. In orhto-hydrogen, the spin of protons are in the same direction .
II. Orthro-hydrogen is more stable than the para from in the ambident condition.
III. At ordinary temperature,ordinary hydrogen is a mixture of about `75%` para and `25%` ortho forms ,
IV. Two forms have similar chemial properties but differ in physical propertise like specific heat and thermal conductivity.
Which of the statements given above are correct ?