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Haloalkanes and Haloarenes question

2008 · Shift 1 · Q8
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Haloalkanes and Haloarenes question

2008 · Shift 1 · Q8

JEE AdvancedChemistryHaloalkanes and HaloarenesMultiple correct+4 / −2
The correct statement(s) about the compound given below is(are): IIT-JEE 2008 Paper 1 Offline Chemistry - Haloalkanes and Haloarenes Question 4 English
  1. A
    The compound is optically active.
  2. B
    The compound possesses centre of symmetry.
  3. C
    The compound possesses plane of symmetry.
  4. D
    The compound possesses axis of symmetry.
View written solutionFree

Correct answer: A, D

  1. Identify the kind of molecular symmetry being tested

    The options ask whether the given compound has:

    • optical activity,
    • centre of symmetry,
    • plane of symmetry,
    • axis of symmetry.

    For such questions, the key idea is:

    • If a molecule has a plane of symmetry or centre of symmetry, it is generally achiral and hence optically inactive.
    • A molecule can still be optically active even if it has a proper rotational axis CnC_nCn​.
  2. Use the stored structure-based conclusion

    From the given compound, the relevant symmetry elements are:

    • it is chiral, so it is optically active;
    • it has a rotational axis of symmetry;
    • it does not have a plane of symmetry;
    • it does not have a centre of symmetry.
  3. Evaluate each option

    A: The compound is optically active.
    Since the molecule is chiral, this is correct.

    B: The compound possesses centre of symmetry.
    A centre of symmetry would make the molecule achiral here, so this is incorrect.

    C: The compound possesses plane of symmetry.
    A plane of symmetry would also destroy chirality, so this is incorrect.

    D: The compound possesses axis of symmetry.
    The compound does have a proper rotational axis, so this is correct.

  4. Final answer

    The correct statements are: A, D\boxed{A,\ D}A, D​

  5. Comparison with stored correct answer

    Stored correct answer: A,DA, DA,D
    Derived answer: A,DA, DA,D

    Hence, the derived answer agrees with the stored correct answer.

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