Q20 / 75 · JEE Main 2025 (3 Apr Shift 1) · Chemistry
Given below are two statements
Statement I : The N-N single bond is weaker and longer than that of $\mathrm{P}-\mathrm{P}$ 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
Statement I : The N-N single bond is weaker and longer than that of $\mathrm{P}-\mathrm{P}$ 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
- AStatement I is true but statement II is false
- Correct answerBBoth statement I and statement II are false
- CStatement I is false but statement II is true
- DBoth statement I and statement II are true
Solution
$\ddot{\mathrm{N}}-\ddot{\mathrm{N}}$ single bond weaker than $\ddot{\mathrm{P}}-\ddot{\mathrm{P}}$ due to more $\ell \mathrm{p}-\ell \mathrm{p}$ repulsion.
Bond length $\Rightarrow d_{p-p} \gt d_{N-N}(\operatorname{size} \uparrow$, B.L. $\uparrow)$
In group 15 elements only N \& P show disproportionation in +3 oxidation state, As, Sb \& Bi have almost inert for disproportionation in +3 oxidation state.
So both statements are false.
Bond length $\Rightarrow d_{p-p} \gt d_{N-N}(\operatorname{size} \uparrow$, B.L. $\uparrow)$
In group 15 elements only N \& P show disproportionation in +3 oxidation state, As, Sb \& Bi have almost inert for disproportionation in +3 oxidation state.
So both statements are false.
Hence, the correct answer is option: 'B'.