Which of the following statements is correct in the context of the allene molecule, C3H4 ?

Which of the following statements is correct in the context of the allene molecule, C3H4 ?

  1. A

    The central carbon atom is sp hybridized

  2. B

    The terminal carbon atoms are sp2 hybridized

  3. C

    The planes containing the CH2 groups are mutually perpendicular to permit the formation of two separate π-bonds

  4. D

    C3H4 is a planar molecule.

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    Solution:

    The central C atom in the allene molecule is sp hybridised, and the remaining two C atoms are sp2 hybridised.
    As a result, the central C atom possesses two double bonds, compared to just one double bond for each of the other two C atoms.
    On the centre carbon atom, there are two unhybridized, mutually perpendicular p orbitals. Two pi bonds are created between these two unhybridized p orbitals and two nearby C atoms.
    As a result, the planes that include the CH2 groups are perpendicular to one another.

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