Which one of the following forms a stable gem diol? (a) \( \mathrm{HCHO} \) (b) \( \mathrm{CH}_{...

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Which one of the following forms a stable gem diol?
(a) \( \mathrm{HCHO} \)
(b) \( \mathrm{CH}_{3} \mathrm{CHO} \)
(c) \( \mathrm{CH}_{3} \mathrm{COCH}_{3} \)
(d) \( \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{COCH}_{3} \)
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