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Question

How many sigma bonds are present in naphthalene?


A
3
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B
19
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C
15
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D
20
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Solution

The correct option is B 19
Naphthalene has the molecular formula of (C10H8).
CC bond formed is by the pp overlap between the two half filled p -orbitals of the carbon atoms. There are a total of 11 CC bonds.
CH bond is formed by the sp overlap between the two half filled s orbital and p -orbital of the Hydrogen and carbon atoms respectively. There are a total of 8 CH bonds.
So, it has 19 sigma bonds and 5 pi bonds.

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