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Question

The molecule(s) having pπpπ back bonding among the following is/are:

A
BCl3
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B
BF3
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C
BeCl2
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D
Both a and b
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Solution

The correct option is D Both a and b
BF3 and BCl3 have trigonal planar geometry. There exists pπpπ back bonding between the vacant 2p orbital of B and filled 2p orbital of F in BF3 and filled 3p orbital of Cl in BCl3 respectively.

Back bonding does not exist in BeCl2. To complete its octet BeCl2 exist as polymer.

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