Would love help with this: Consider the following observations: 1. NiCl2 readily

Question

Would love help with this:

Consider the following observations:
1. NiCl2 readily dissolves in water to give a green solution; it dissolves more slowly in ethanol to give a blue solution; it is insoluble in hexane, C6H14.

2. When the water solution, assumed to be in the form [Ni(OH2)6]2+, is treated with ethanol no color change is observed; however, when the ethanol solution is treated with wa- ter, the color of the solution quickly becomes lighter.

3. When a small quantity of KCN is added to either the ethanol or water solution, the solution rapidly turns a deep blue color.

Based on these observations, which is the correct order of these ligands in terms of high- est to lowest (decreasing) Lewis basicity?

1. KCN - H2O - ethanol - hexane

2. Ethanol - KCN - H2O - hexane

3. H2O - hexane - ethanol - KCN

4. H2O - KCN - ethanol - hexane

5. Ethanol - hexane - KCN - H2O

6. KCN - ethanol - hexane - H2O

7. Hexane - ethanol - H2O - KCN

Explanation / Answer

Lewis base mean it donates lone pairs.when the danating ability increases lewis basicity will increase.

4 is the answer..

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