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The minimum number of C atoms an alkyne ...

The minimum number of C atoms an alkyne must have to show diastereomerism:

A

4

B

5

C

6

D

7

Text Solution

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The correct Answer is:
To determine the minimum number of carbon (C) atoms an alkyne must have to show diastereomerism, we can follow these steps: ### Step-by-Step Solution: 1. **Understand Diastereomerism**: - Diastereomers are stereoisomers that are not mirror images of each other. In alkenes and alkynes, this typically involves cis-trans isomerism. 2. **Identify the Structure of Alkynes**: - Alkynes contain a carbon-carbon triple bond (C≡C). The simplest alkyne is ethyne (C2H2), which does not have the necessary complexity for diastereomerism. 3. **Determine the Minimum Carbon Requirement**: - For an alkyne to show diastereomerism, it must have substituents that can create different spatial arrangements. This requires at least one carbon-carbon double bond (C=C) in addition to the triple bond. - The simplest alkyne that can exhibit this feature is 2-butyne (C4H6), but it does not have enough substituents to show diastereomerism. 4. **Construct a Suitable Alkyne**: - Consider 3-pentyne (C5H10). It has a triple bond and can have substituents that allow for cis and trans configurations. - The structure for 3-pentyne is CH3-C≡C-CH2-CH3. 5. **Visualize the Isomers**: - In 3-pentyne, you can have: - **Cis Isomer**: where the methyl (CH3) groups are on the same side of the triple bond. - **Trans Isomer**: where the methyl groups are on opposite sides of the triple bond. 6. **Conclusion**: - Therefore, the minimum number of carbon atoms required for an alkyne to exhibit diastereomerism is **5**. ### Final Answer: The minimum number of C atoms an alkyne must have to show diastereomerism is **5**. ---
To determine the minimum number of carbon (C) atoms an alkyne must have to show diastereomerism, we can follow these steps: ### Step-by-Step Solution: 1. **Understand Diastereomerism**: - Diastereomers are stereoisomers that are not mirror images of each other. In alkenes and alkynes, this typically involves cis-trans isomerism. 2. **Identify the Structure of Alkynes**: ...
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