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  4. How to find sigma and pi bond?
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How to find sigma and pi bond?

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Offline Indranil (OP)

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How to find sigma and pi bond?
« on: 23/07/2019 07:53:04 »
How to find sigma and pi bond? please tell me the methods, please.

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Offline Kryptid

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Re: How to find sigma and pi bond?
« Reply #1 on: 23/07/2019 08:07:44 »
Under most circumstances (I think there are some exceptions, like disulfur dinitride), any single bond will be a sigma bond, whereas any bond order greater than one will have a sigma bond plus some amount of pi bonding. So double bonds and triple bonds have pi bonds in them, as do resonance bonds like in nitrogen dioxide and aromatic bonds like in benzene rings.

In your particular example, count the number of double bonds in the whole molecule. That will tell you how many electron pairs are present in the pi bonds.
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Offline Indranil (OP)

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Re: How to find sigma and pi bond?
« Reply #2 on: 23/07/2019 10:36:27 »
Quote from: Kryptid on 23/07/2019 08:07:44
Under most circumstances (I think there are some exceptions, like disulfur dinitride), any single bond will be a sigma bond, whereas any bond order greater than one will have a sigma bond plus some amount of pi bonding. So double bonds and triple bonds have pi bonds in them, as do resonance bonds like in nitrogen dioxide and aromatic bonds like in benzene rings.

In your particular example, count the number of double bonds in the whole molecule. That will tell you how many electron pairs are present in the pi bonds.
There are three pi bonds in the molecule in the diagram If I count but why 4 pi bonds are written there in the diagram?
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Offline Indranil (OP)

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Re: How to find sigma and pi bond?
« Reply #3 on: 23/07/2019 10:42:29 »
Quote from: Indranil on 23/07/2019 10:36:27
Quote from: Kryptid on 23/07/2019 08:07:44
Under most circumstances (I think there are some exceptions, like disulfur dinitride), any single bond will be a sigma bond, whereas any bond order greater than one will have a sigma bond plus some amount of pi bonding. So double bonds and triple bonds have pi bonds in them, as do resonance bonds like in nitrogen dioxide and aromatic bonds like in benzene rings.

In your particular example, count the number of double bonds in the whole molecule. That will tell you how many electron pairs are present in the pi bonds.
There are three pi bonds in the molecule in the diagram If I count but why 4 pi bonds are written there in the diagram?
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Offline Indranil (OP)

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Re: How to find sigma and pi bond?
« Reply #4 on: 23/07/2019 10:46:19 »
Quote from: Indranil on 23/07/2019 10:42:29
Quote from: Indranil on 23/07/2019 10:36:27
Quote from: Kryptid on 23/07/2019 08:07:44
Under most circumstances (I think there are some exceptions, like disulfur dinitride), any single bond will be a sigma bond, whereas any bond order greater than one will have a sigma bond plus some amount of pi bonding. So double bonds and triple bonds have pi bonds in them, as do resonance bonds like in nitrogen dioxide and aromatic bonds like in benzene rings.

In your particular example, count the number of double bonds in the whole molecule. That will tell you how many electron pairs are present in the pi bonds.

If I count there are 3 pi bonds in the molecule but 4 is written in the diagram. so how is it possible?
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Offline chiralSPO

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Re: How to find sigma and pi bond?
« Reply #5 on: 23/07/2019 12:09:55 »
The COOH part has a pi bond between the C atom and one of the O atoms. That is the fourth.
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Offline Kryptid

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Re: How to find sigma and pi bond?
« Reply #6 on: 23/07/2019 22:22:26 »
There was no need for you to ask the same question three times in a row.
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Offline loosi007

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Re: How to find sigma and pi bond?
« Reply #7 on: 13/08/2019 14:26:15 »
Usually, all bonds between atoms in most organic compounds contain one sigma bond each. If it is a single bond, it contains only sigma bond. Double and Triple bonds, however, contains sigma and pi bonds. Double bonds have one each, and triple bonds have one sigma bond and two pi bonds.

1 single bond = 1 sigma bond

1 double bond = 1 sigma bond + 1 pi bond

1 triple bond = 1 sigma bond + 2 pi bonds
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