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Question

Match the molecules with their correct geometry.


Your Answer
A
Linear
Your Answer
B
Tetrahedral
Your Answer
C
Trigonal planar

Solution

The correct option is
According to VSEPRT, in a molecule repulsion between electron pairs follow the order:
lone pair - lone pair > lone pair - bond pair > bond pair - bond pair.

In BeCl2, there are two bond pairs on the central atom. To minimise the bond pair-bond pair repulsion, the shape will be linear. 

In AlCl3, there are three bond pair on the central atom. To minimise the bond pair-bond pair repulsion the shape of will be trigonal planar. 

In NH3, the central atom has three bond pair and one lone pair. To minimise the repulsion between bond pair-bond pair and bond pair-lone pair, the shape of molecule will be tetrahedral. 

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