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Chemical Bonding and Molecular Structure

Multiple Choice Questions

91.

Which of the following species shows the maximum magnetic moment?

Mn⁶⁺
Ni²⁺
Fe³⁺
Ag⁺

92.

C-H bond length is least in

acetylene
methane
ethylene
ethane

93.

[Cu(NH₃)₄]²⁺ shows the following hybridization

dsp²
sp³d
dsp³
sp³

94.

What is the geometry of molecule of bromine penta fluoride?

Square planar
Trigonal bipyramidal
Squre pyramidal
Octahedral

95.
Bond order of which among the following molecules is zero?

F₂

O₂

Be₂

Li₂

Be₂

$(a) F_{2} molecules = σ 1 s^{2}, \overset{*}{σ} 1 s^{2}, σ 2 s^{2}, \overset{*}{σ} 2 p_{z}^{2}, π 2 p_{x}^{2} ≃ π 2 p_{y}^{2}, \overset{*}{π} 2 p_{x}^{2} ≃ \overset{*}{π} 2 p_{y}^{2} Bond order = \frac{1}{2} (N_{b} - N_{a}) = \frac{1}{2} (10 - 8) = 1 (b) O_{2} molecule = σ 1 s^{2}, \overset{*}{σ} 1 s^{2}, σ 2 s^{2}, \overset{*}{σ} 2 s^{2}, \overset{*}{σ} 2 p_{z}^{2}, π 2 p_{x}^{2} ≃ π 2 p_{y}^{2}, \overset{*}{π} 2 p_{x}^{1} ≃ \overset{*}{π} 2 p_{y}^{1} Bond order = \frac{1}{2} (N_{b} - N_{a}) = \frac{1}{2} (10 - 6) = 2 (c) {Be}_{2} molecule = σ 1 s^{2}, \overset{*}{σ} 1 s^{2}, σ 2 s^{2}, \overset{*}{σ} 2 s^{2} Bond order = \frac{1}{2} (N_{b} - N_{a}) = \frac{1}{2} (4 - 4) = 0 (d) {Li}_{2} molecule = σ 1 s^{2}, \overset{*}{σ} 1 s^{2}, σ 2 s^{2} Bond order = \frac{1}{2} (N_{b} - N_{a}) = \frac{1}{2} (4 - 2) = 1 Therefore, {Be}_{2} molecule has zero bond order .$