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Basics of Organic Chemistry question

2007 · Shift 0 · Q2
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Basics of Organic Chemistry question

2007 · Shift 0 · Q2

JEE MainChemistryBasics of Organic ChemistryMCQ+4 / −1
Which one of the following conformation of cyclohexane is chiral?
  1. A
    Twist boat
  2. B
    Rigid
  3. C
    Chair
  4. D
    Boat
View written solutionFree

Correct answer: A

  1. Recall the common conformations of cyclohexane

    The important conformations are:

    • Chair
    • Boat
    • Twist-boat (or skew-boat)

  2. Check which conformations are chiral or achiral

    (a) Chair conformation

    The normal chair form has symmetry elements and is achiral.

    (b) Boat conformation

    The boat form also has a plane of symmetry, so it is achiral.

    (c) Twist-boat conformation

    In the twist-boat form, the symmetry plane is lost. It exists in two non-superimposable mirror-image forms, so it is chiral.

    (d) Rigid

    "Rigid" is not a standard conformation of cyclohexane.

  3. Conclusion

    Therefore, the chiral conformation of cyclohexane is: Twist boat\boxed{\text{Twist boat}}Twist boat​

  4. Option-wise evaluation

    • A: Twist boat — Correct, it is chiral.
    • B: Rigid — Incorrect, not a cyclohexane conformation.
    • C: Chair — Incorrect, achiral.
    • D: Boat — Incorrect, achiral.

  5. Comparison with stored correct answer

    Stored correct answer: A

    Derived answer: A

    They match.

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