In contrast to NH 3 ,
the rest of the Group 15, MH 3 compounds, show relatively poor Lewis
base character. Why is this?

Question

In contrast to NH 3 ,
the rest of the Group 15, MH 3  compounds, show relatively poor Lewis
base character. Why is this?

Answer

The hydrides are ionic.

Answer

For the rest of the Group
15 hydrides, the lone pair is not
readily available for bonding.

Answer

The centers are sterically hindered due to short bond lengths and it is difficult to coordinate to the lone pair.

Answer

There are fewer valence
electrons available.

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