Which of the following sets is not isoelectro | vedclass

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(B) Isoelectronic species are those that have the same number of electrons.$(A)$ $BO_3^{3-}: 5 + 3(8) + 3 = 32$; $NO_3^-: 7 + 3(8) + 1 = 32$; $CO_3^{2

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$SO_3^{2-}, CO_3^{2-}, NO_3^-$

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(B) Isoelectronic species are those that have the same number of electrons.$(A)$ $BO_3^{3-}: 5 + 3(8) + 3 = 32$; $NO_3^-: 7 + 3(8) + 1 = 32$; $CO_3^{2-}: 6 + 3(8) + 2 = 32$. (All are isoelectronic)$(B)$ $SO_3^{2-}: 16 + 3(8) + 2 = 42$; $CO_3^{2-}: 32$; $NO_3^-: 32$. (Not isoelectronic)$(C)$ $CN^-: 6 + 7 + 1 = 14$; $N_2: 7 + 7 = 14$; $C_2^{2-}: 6 + 6 + 2 = 14$. (All are isoelectronic)$(D)$ $PO_4^{3-}: 15 + 4(8) + 3 = 50$; $SO_4^{2-}: 16 + 4(8) + 2 = 50$; $ClO_4^-: 17 + 4(8) + 1 = 50$. (All are isoelectronic)Therefore,the set in option $B$ is not isoelectronic.

List-$I$	List-$II$
$(1)$ Kossel and Lewis	$(A)$ $VSEPR$
$(2)$ Langmuir	$(B)$ Molecular Orbital Theory
$(3)$ Sidgwick and Powell	$(C)$ Covalent Bond
$(4)$ Heitler and London	$(D)$ Octet Rule
$(5)$ $F$. Hund and Mulliken	$(E)$ Valence Bond Theory

List-$I$	List-$II$
$(A)$ $C_{2}H_{4}$	$(I)$ $3\sigma$ bonds, $2\pi$ bonds
$(B)$ $C_{2}H_{2}$	$(II)$ $3\sigma$ bonds, $1$ lone pair
$(C)$ $CH_{4}$	$(III)$ $4\sigma$ bonds
$(D)$ $NH_{3}$	$(IV)$ $5\sigma$ bonds, $1\pi$ bond

Which of the following sets is not isoelectronic?

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