Which of the following has been arranged in order of increasing bond strength :

Z n_{2}^{2 +} < H g_{2}^{2 +} < C d_{2}^{2 +}

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C d_{2}^{2 +} < H g_{2}^{2 +} < Z n_{2}^{2 +}

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Z n_{2}^{2 +} < C d_{2}^{2 +} < H g_{2}^{2 +}

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H g_{2}^{2 +} < C d_{2}^{2 +} < Z n_{2}^{2 +}

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Solution

The correct option is C $Z n_{2}^{2 +} < C d_{2}^{2 +} < H g_{2}^{2 +}$
According to Aufbau principle, electron enters lower energy orbital first, in the case of Zn, Cd, Hg the last electron is filled in n-1 d orbital but not in ns orbital.
As the atomic radii increases, it weakens the nuclear attraction (net electrostatic forces of attraction between nucleus and valence electrons), causing outermost electrons to be loosely held and easily lost, increasing reactivity down the group as a result.
Moving down the group, increases the bond strength.

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