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(D) Step $1$: Analyze $(a)$. The dipole moment of $BF_3$ is $0$ (non-polar). In $NH_3$ and $NF_3$, both have lone pairs, but in $NH_3$, the bond dipol

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None of these

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(D) Step $1$: Analyze $(a)$. The dipole moment of $BF_3$ is $0$ (non-polar). In $NH_3$ and $NF_3$, both have lone pairs, but in $NH_3$, the bond dipoles and lone pair dipole are in the same direction, whereas in $NF_3$, they oppose each other. Thus, the order is $NH_3 > NF_3 > BF_3$. The given order $BF_3 Step $2$: Analyze $(b)$. $HgCl_2$ is linear $(180^\circ)$, $NH_4^+$ is tetrahedral $(109.5^\circ)$, and $SF_6$ is octahedral $(90^\circ)$. The order $HgCl_2 > NH_4^+ > SF_6$ is correct.Step $3$: Since both orders are correct, the statement 'does not agree' is false for both. Therefore, the correct option is $(d)$.

In which of the following options, the order of arrangement does not agree with the variation of property indicated against it?
$(a)$ $BF_3 < NF_3 < NH_3$ (Dipole moment)
$(b)$ $HgCl_2 > NH_4^+ > SF_6$ (Bond angle)

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In which of the following options, the order of arrangement does not agree with the variation of property indicated against it?$(a)$ $BF_3 < NF_3 < NH_3$ (Dipole moment)$(b)$ $HgCl_2 > NH_4^+ > SF_6$ (Bond angle)