Which of the following statements is wrong?

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(A) The stability of hydrides decreases from $NH_3$ to $BiH_3$ as we move down the group $15$. This is because the size of the central atom increases,

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The stability of hydrides increases from $NH_3$ to $BiH_3$ in group $15$ of the periodic table.

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(A) The stability of hydrides decreases from $NH_3$ to $BiH_3$ as we move down the group $15$. This is because the size of the central atom increases,leading to a weaker $M-H$ bond due to poor orbital overlap.Therefore,the statement in option $A$ is incorrect.Additionally,nitrogen cannot form $d\pi - p\pi$ bonds because it lacks $d$-orbitals in its valence shell.The single $N-N$ bond is weaker than the $P-P$ bond due to high inter-electronic repulsion of the non-bonding electrons in the small $N$ atoms.$N_2O_4$ exhibits resonance structures.

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