Which of the following statements is correct in the context of the allene molecule, \( \mathrm{C...

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Which of the following statements is correct in the context of the allene molecule, \( \mathrm{C}_{3} \mathrm{H}_{4} \) ?
(a) The central carbon is \( s p \) hybridized
(b) The terminal carbon atoms are \( s p^{2} \) hybridized
(c) The planes containing the \( \mathrm{CH}_{2} \) groups are mutually perpendicular to permit the formations two separate \( \pi \)-bonds
(d) All are correct
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