Give reasons for the following observations :
The third ionisation enthalpy of manganese (Z = 25) is exceptionally high

Give reasons for the following observations: Leather gets hardened after tanning.

Give reasons for the following observations: Lyophilic sol is more stable than lyophobic

Suggest a possible reason for the following observations: The order of reactivity of haloalkanes is RIgtRBrgtRCl .

Suggest a possible reason for the following observations: neo-pentyl chloride, (CH_(3))_(3)C-CH_(2)Cl does not follow S_(N)2 mechanism.

(a) Give reasons for the following: (i) Ethyl iodide Undergoes SN_(2) reaction faster than ethyl bromide.