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JEE MainChemistryp Block Elements (Group 15, 16, 17 & 18)

Consider the following statements regarding the properties of Group 15 elements: (A) Nitrogen has a lower tendency for catenation than phosphorus because the N-N single bond is weaker than the P-P single bond. (B) The tendency to undergo disproportionation in the +3 oxidation state decreases from phosphorus to bismuth. (C) All Group 15 elements readily disproportionate in their +3 oxidation state in aqueous solution.

Options

  1. A(A) and (B) only
  2. B(A), (B) and (C) only
  3. C(A) and (D) only
  4. D(C) and (D) only

Correct answer

A. (A) and (B) only

Step-by-step solution

Statement (A) is correct. The catenation tendency depends on the strength of the element-element single bond. Since the N-N single bond is weaker than the P-P single bond (due to high lone pair-lone pair repulsion in the smaller nitrogen atoms), nitrogen shows a much lower tendency for catenation than phosphorus. Statement (B) is correct. Moving down the group from P to Bi, the stability of the +3 oxidation state increases due to the inert pair effect. Consequently, the tendency of the +3 state to disproportionate

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