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The number of sigma and pi-bonds in 1-butene 3-yne are
- a)5 sigma and 5 pi
- b)7 sigma and 3 pi
- c)8 sigma and 2 pi
- d)6 sigma and 4 pi
Correct answer is option 'B'. Can you explain this answer?
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The number of sigma and pi-bonds in 1-butene 3-yne area)5 sigma and 5 ...
CH2 = CH – C ≡ CH;
No of σ bonds = 2 + 1 + 1 + 1 / 1 + 1 = 7;
No of π bonds = 1 + 2 = 3
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The number of sigma and pi-bonds in 1-butene 3-yne area)5 sigma and 5 ...
Sigma and Pi Bonds in 1-Butene-3-Yne
Sigma and pi bonds are types of covalent bonds formed between two atoms in a molecule. Sigma bonds are formed by the direct overlap between two atomic orbitals while pi bonds are formed by the sideways overlap of two atomic orbitals. In 1-Butene-3-yne, there are two functional groups present- an alkene and an alkyne.
The structure of 1-butene-3-yne can be represented as:
CH3-CH=CH-CH2-C≡CH
The number of sigma and pi bonds in 1-butene-3-yne are as follows:
A) 5 sigma and 5 pi
B) 7 sigma and 3 pi
C) 8 sigma and 2 pi
D) 6 sigma and 4 pi
Explanation:
Sigma bonds in 1-butene-3-yne:
- Between two carbon atoms in the alkene group, there is a sigma bond (C-C)
- Between the carbon atom in the alkene group and the adjacent carbon atom in the chain, there is a sigma bond (C-C)
- Between the two carbon atoms in the alkyne group, there are two sigma bonds (C-C)
- Between the carbon atom in the alkyne group and the adjacent carbon atom in the chain, there is a sigma bond (C-C)
- Between the carbon atom in the alkyne group and the adjacent hydrogen atom, there is a sigma bond (C-H)
Therefore, there are a total of 7 sigma bonds in 1-butene-3-yne.
Pi bonds in 1-butene-3-yne:
- Between the two carbon atoms in the alkene group, there is a pi bond (C=C)
- Between the two carbon atoms in the alkyne group, there are two pi bonds (C≡C)
Therefore, there are a total of 3 pi bonds in 1-butene-3-yne.
Conclusion:
Hence, the correct option is B) 7 sigma and 3 pi bonds in 1-butene-3-yne.
Sigma and pi bonds are types of covalent bonds formed between two atoms in a molecule. Sigma bonds are formed by the direct overlap between two atomic orbitals while pi bonds are formed by the sideways overlap of two atomic orbitals. In 1-Butene-3-yne, there are two functional groups present- an alkene and an alkyne.
The structure of 1-butene-3-yne can be represented as:
CH3-CH=CH-CH2-C≡CH
The number of sigma and pi bonds in 1-butene-3-yne are as follows:
A) 5 sigma and 5 pi
B) 7 sigma and 3 pi
C) 8 sigma and 2 pi
D) 6 sigma and 4 pi
Explanation:
Sigma bonds in 1-butene-3-yne:
- Between two carbon atoms in the alkene group, there is a sigma bond (C-C)
- Between the carbon atom in the alkene group and the adjacent carbon atom in the chain, there is a sigma bond (C-C)
- Between the two carbon atoms in the alkyne group, there are two sigma bonds (C-C)
- Between the carbon atom in the alkyne group and the adjacent carbon atom in the chain, there is a sigma bond (C-C)
- Between the carbon atom in the alkyne group and the adjacent hydrogen atom, there is a sigma bond (C-H)
Therefore, there are a total of 7 sigma bonds in 1-butene-3-yne.
Pi bonds in 1-butene-3-yne:
- Between the two carbon atoms in the alkene group, there is a pi bond (C=C)
- Between the two carbon atoms in the alkyne group, there are two pi bonds (C≡C)
Therefore, there are a total of 3 pi bonds in 1-butene-3-yne.
Conclusion:
Hence, the correct option is B) 7 sigma and 3 pi bonds in 1-butene-3-yne.
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