Chemistry, 21.07.2019 14:30 alex1975

What is the molecular geometry about nitrogen in ch3nh2?

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In Methyl Amine the Nitrogen atom is attached to two Hydrogen Atoms and one Methyl (CH₃-) group. From Lewis structure it is shown that the Nitrogen atom also contains a lone pair of electron.
So,
According to Valence Shell Electron Pair Repulsion (VSEPR) Theory, those central atoms which have four electron pairs and all of them are bonding electron pairs gives Tetrahedral Geometry.

Methylamine also contains four electron pairs, but out of four only three are bonding pair electrons and one lone pair electron. Now, due to presence of lone pair of electron (which has greater repulsion effect than bonding electron pair) the bond angle between H-N-H will decrease from 109° to 107° and results in the formation of Trigonal Pyramidal geometry as shown below,
What is the molecular geometry about nitrogen in ch3nh2?

What is the molecular geometry about nitrogen in ch3nh2?

Answer from: garciatania837

Methylamine is widely used in the making of pharmaceuticals, surfactants, and rubber chemicals. The lewis structure of methylamine determined the presence of lone pairs on nitrogen and have a trigonal pyramidal shape.

Methylamine is an organic molecule, in which one methyl group (CH3) and one amine group (NH3) are present.

The given below in the attachment is the lewis dot structure of methylamine.

The lewis dot structure is based on the Valence Shell Electron Pair Repulsion Theory (VSEPR). According to this theory:

The central atom carbon has four valence electrons, out of which three are bonded with Hydrogen (H) and one with Nitrogen (N). Similarly, the methylamine also has four electron pairs, out of which three are bonded and one is lone pair. The presence of lone pair of electrons on the nitrogen will create a greater repulsion effect than bonding pairs. Thus, the bond length of H-N-H will be decreased due to lone pairs, the angle will decrease from 109-degrees to 107-degrees. This, decrease in the angle will result in the shape of trigonal pyramidal geometry of the amine group in methylamine.

Therefore, amine group will have trigonal pyramidal geomtery.

To know more about lewis dot structure, refer to the following link:

link

Answer from: Quest

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