Given below are two statements :

Statement I : The N - N single bond is weaker and longer than that of P - P single bond.

Statement II : Compounds of group 15 elements in +3 oxidation states readily undergo disproportionation reactions.

In the light of the above statements, choose the correct answer from the options given below

$$ \text { Which compound would give 3-methyl-6-oxoheptanal upon ozonolysis? } $$

Which of the following properties will change when system containing solution 1 will become solution 2 ?