JEE MAIN - Chemistry (2023 - 29th January Morning Shift - No. 15)
The number of molecules or ions from the following, which do not have odd number of electrons are _________.
(A) NO$$_2$$
(B) ICl$$_4^ - $$
(C) BrF$$_3$$
(D) ClO$$_2$$
(E) NO$$_2^ + $$
(F) NO
Answer
3
Explanation
Only $\mathrm{ICl}_4^{-}, \mathrm{BrF}_3$ and $\mathrm{NO}_2^{+}$have even number of electrons.
$$ \begin{aligned} & \mathrm{NO}_2 \Rightarrow 23 e^{-} ; \\\\ & \mathrm{ICl}_4^{-} \Rightarrow 122 e^{-} ; \\\\ & \mathrm{BrF}_3 \Rightarrow 62 e^{-} ; \\\\ & \mathrm{ClO}_2 \Rightarrow 33 e^{-} ; \\\\ & \mathrm{NO}_2^{+} \Rightarrow 22 e^{-} ; \\\\ & \mathrm{NO} \Rightarrow 15 e^{-} \end{aligned} $$
$$ \begin{aligned} & \mathrm{NO}_2 \Rightarrow 23 e^{-} ; \\\\ & \mathrm{ICl}_4^{-} \Rightarrow 122 e^{-} ; \\\\ & \mathrm{BrF}_3 \Rightarrow 62 e^{-} ; \\\\ & \mathrm{ClO}_2 \Rightarrow 33 e^{-} ; \\\\ & \mathrm{NO}_2^{+} \Rightarrow 22 e^{-} ; \\\\ & \mathrm{NO} \Rightarrow 15 e^{-} \end{aligned} $$
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