Which of the following acts as interstitial hydride?

Which one of the following is correct order of given isotopes?

I. T₂ > D₂ > P₂ (order of boiling point)

II. T₂ > D₂ > P₂ (order of bond energy)

III. T₂ = D₂ = P₂ (order of bond length)

IV. T₂ < D₂ < P₂ (order of reactivity with Cl₂)

ortho and para form of hydrogen have

Some statements about heavy water are given below

3. Heavy water is more effective solvent than ordinary water.

Which of the above statements are correct?