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Single N−N bond is weaker than the single P−P bond. This is because of:

(a) larger N−N bond length in comparison to P−P bond length

(b) high inter electronic repulsion of the non-bonding electrons, owing to the small N−N bond length in comparison to that in P−P single bond

(c) higher electronegativity of NN in comparison to PP

(d) smaller atomic size of NN as compared to that of P

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1 Answer

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Correct option is (b) high interelectronic repulsion of the non-bonding electrons, owing to the smell N-N bond length in comparison to that in  P-P single bond.

N−N single bond is weaker than P−P bond due to smaller size of N as compared to P. Smaller size of N leads to smaller N−N bond length. As a result, the lone pair of electrons on the both the N atoms repel each other leading to unstability or weakening of N−N bond. Because of larger size of P atom, P−P bond length is more and lone pair-lone pair repulsion between P atoms is less which makes the P−P bond stronger than N−N bond.

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