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Aldehydes, Ketones and Carboxylic Acids
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Practical Organic Chemistry
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1
JEE Main 2022 (Online) 28th July Evening Shift
MCQ (More than One Correct Answer)
+4
-1

Which of the following pair is not isoelectronic species?

(At. no. Sm, 62; Er, 68; Yb, 70; Lu, 71; Eu, 63; Tb, 65; Tm, 69)

A
$$\mathrm{Sm}^{2+}$$ and $$\mathrm{Er}^{3+}$$
B
$$\mathrm{Yb}^{2+}$$ and $$\mathrm{Lu}^{3+}$$
C
$$\mathrm{Eu}^{2+}$$ and $$\mathrm{Tb}^{4+}$$
D
$$\mathrm{Tb}^{2+}$$ and $$\mathrm{Tm}^{4+}$$
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JEE Main 2022 (Online) 28th July Evening Shift (1)
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