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Which of the following compounds is not ...

Which of the following compounds is not chiral ?

A

1-chloropentane

B

2-chloropenatne

C

1-chloro-2-methylpentane

D

3-chloro-2-methylpentane

Text Solution

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The correct Answer is:
To determine which of the given compounds is not chiral, we need to identify the presence of chiral centers in each compound. A chiral center is typically an sp3 hybridized carbon atom that is bonded to four different groups. If a compound has a chiral center, it is considered chiral; if it does not, it is achiral. ### Step-by-Step Solution: 1. **Identify the Compounds**: We have four compounds to analyze: - 1-chloropentane - 2-chloropentane - 1-chloro-2-methylpentane - 3-chloro-2-methylpentane 2. **Draw the Structures**: - **1-chloropentane**: This compound has a straight-chain structure with chlorine attached to the first carbon. - **2-chloropentane**: Here, chlorine is attached to the second carbon of the pentane chain. - **1-chloro-2-methylpentane**: This structure has a chlorine atom on the first carbon and a methyl group on the second carbon. - **3-chloro-2-methylpentane**: In this case, chlorine is on the third carbon and a methyl group on the second carbon. 3. **Analyze Each Compound for Chiral Centers**: - **1-chloropentane**: The first carbon has two hydrogens attached, making it not a chiral center. Therefore, 1-chloropentane is achiral. - **2-chloropentane**: The second carbon has four different groups (Cl, CH2, CH3, and H), making it a chiral center. Thus, it is chiral. - **1-chloro-2-methylpentane**: The carbon with the chlorine and methyl groups also has four different groups attached, making it chiral. - **3-chloro-2-methylpentane**: Similar to the previous case, the carbon with chlorine and methyl groups is also chiral. 4. **Conclusion**: Among the four compounds, only **1-chloropentane** does not have a chiral center and is therefore not chiral. The other three compounds are chiral. ### Final Answer: The compound that is not chiral is **1-chloropentane**.

To determine which of the given compounds is not chiral, we need to identify the presence of chiral centers in each compound. A chiral center is typically an sp3 hybridized carbon atom that is bonded to four different groups. If a compound has a chiral center, it is considered chiral; if it does not, it is achiral. ### Step-by-Step Solution: 1. **Identify the Compounds**: We have four compounds to analyze: - 1-chloropentane - 2-chloropentane - 1-chloro-2-methylpentane ...
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Knowledge Check

  • Which of the following compound is not chiral ?

    A
    1-chloropentane
    B
    3-chloro-2-methylpentane
    C
    1-chloro-2-methylpentane
    D
    2-chloropentane
  • Which fo the following compounds is not chiral?

    A
    `DCH_(2)CH_(2)CH_(2)CI`
    B
    `CH_(3)CHDCH_(2)CI`
    C
    `CH_(3)CHCICH_(2)D`
    D
    `CH_(3)CH_(2)CHDCI`
  • Which of the following compounds is chiral?

    A
    3-Pentanol
    B
    1-Pentanol
    C
    3-Methyl-1-butanol
    D
    3-Methyl-2-butanol
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