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Ionic Bond

Consider the ...

Question

Consider the given organometallic compound.
(I) $(C H_{3})_{2} H g$ (II) $(C H_{3})_{2} Z n$ (III) $(C H_{3})_{2} M g$ (IV) $C H_{3} L i$
The correct decreasing order of ionic character is :

I > I I > I I I > I V

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I I > I > I I I > I V

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I > I I I > I I > I V

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I V > I I I > I I > I

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Solution

The correct option is C $I V > I I I > I I > I$
On moving from left to right in the periodic table, the atomic radius decreases. So the electrons come closer to the nucleus; hence it is difficult to remove electrons due to increased nuclear forces of attraction.
The tendency to form ionic bond decreases and covalent bonds increases.
${C H}_{3} L i > {(C H}_{3})_{2} M g > {(C H}_{3})_{2} Z n > {(C H}_{3})_{2} H g$

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