Given below are two statements : In the light of the above statements, choose the correct answer from the options given below
- Statement I is false but Statement II is true
- Both Statement I and Statement II are true
- Both Statement I and Statement II are false
- Statement I is true but Statement II is false
Answer
(3) Both Statement I and Statement II are false
Solution
Statement I: As per NCERT, the N–N single bond is weaker than the P–P single bond because of the high interelectronic repulsion of the non-bonding electrons, owing to the small N–N bond length.
N–N is weaker but shorter (not longer) than P–P Statement I is false.
Statement II: Down group 15 the +3 state becomes more stable (inert pair effect); compounds such as BiCl3 and SbCl3 are stable and do not disproportionate. Disproportionation of intermediate states is shown mainly by N and P (e.g. 4H3PO3 3H3PO4 + PH3).
Group 15 compounds in the +3 state do not, in general, readily disproportionate Statement II is false.
Answer: (3)