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Number of sigma and pi bonds present in ...

Number of sigma and pi bonds present in pent- 2-en-4-yne.

A

`13sigma` , `3pi`

B

`11sigma` , `2pi`

C

`10sigma` , `3pi`

D

`12sigma` , `2pi`

Text Solution

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The correct Answer is:
To determine the number of sigma (σ) and pi (π) bonds present in pent-2-en-4-yne, we first need to draw the structure of the compound based on its name. ### Step 1: Draw the Structure 1. **Identify the Carbon Chain**: "Pent" indicates that there are 5 carbon atoms in the main chain. 2. **Identify the Double and Triple Bonds**: The "2-en" indicates a double bond starting at the second carbon, and "4-yne" indicates a triple bond starting at the fourth carbon. The structure can be represented as follows: ``` H H H | | | H--C==C---C≡C--C--H | | H H ``` This shows a 5-carbon chain with a double bond between C2 and C3, and a triple bond between C4 and C5. ### Step 2: Count the Sigma Bonds - **Single Bonds**: Each single bond between carbon atoms (C-C) and between carbon and hydrogen (C-H) is a sigma bond. - **Double Bonds**: In a double bond (C=C), there is 1 sigma bond and 1 pi bond. - **Triple Bonds**: In a triple bond (C≡C), there is 1 sigma bond and 2 pi bonds. Now, let's count: - **C1 to C2**: 1 σ bond - **C2 to C3**: 1 σ bond (double bond contributes 1 σ and 1 π) - **C3 to C4**: 1 σ bond - **C4 to C5**: 1 σ bond (triple bond contributes 1 σ and 2 π) - **C-H bonds**: Each carbon (C1, C2, C3, C4, C5) has hydrogen atoms: - C1: 3 C-H bonds - C2: 1 C-H bond (due to the double bond) - C3: 1 C-H bond (due to the double bond) - C4: 0 C-H bonds (due to the triple bond) - C5: 1 C-H bond Counting the C-H bonds: - C1: 3 - C2: 1 - C3: 1 - C4: 0 - C5: 1 Total C-H bonds = 3 + 1 + 1 + 0 + 1 = 6 Total sigma bonds: - C-C bonds: 4 (C1-C2, C2-C3, C3-C4, C4-C5) - C-H bonds: 6 Total σ bonds = 4 + 6 = 10 ### Step 3: Count the Pi Bonds - From the double bond (C2=C3), there is 1 π bond. - From the triple bond (C4≡C5), there are 2 π bonds. Total π bonds = 1 (from double bond) + 2 (from triple bond) = 3 π bonds. ### Final Count - **Total Sigma Bonds (σ)**: 10 - **Total Pi Bonds (π)**: 3 ### Conclusion The number of sigma and pi bonds present in pent-2-en-4-yne is: - **10 Sigma Bonds** - **3 Pi Bonds**
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