Question

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 above statements, choose the correct answer from the options given below

• A. Statement I is true but Statement II is false
• B. Both Statement I and Statement II are false
• C. Statement I is false but Statement II is true
• D. Both Statement I and Statement II are true

Hint:

Consider the bond strengths and lengths in nitrogen and phosphorus. Recall the trend of disproportionation reactions in group 15 elements.

Answer 1

The Correct Option is B

N-N single bond weaker than P-P due to more lp-lp repulsion. Bond length \( d_{N-N}>d_{P-P} \) (size↑, B.L.↑) 
In group 15 elements only N and P show disproportionation in +3 oxidation state. 
As, Sb and Bi have almost inert for disproportionation in +3 oxidation state. So both statements are false.