Which of the following is incorrect? (1) \( \mathrm{CH}_{3}-\mathrm{CHO} \) undergoes aldol cond...

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Which of the following is incorrect?
(1) \( \mathrm{CH}_{3}-\mathrm{CHO} \) undergoes aldol condensation.
(2) as major product when treated with \( \mathrm{KOH} \)
(3) \( \mathrm{Ph}-\mathrm{CHO} \) does not undergo aldol condensation.
(4) When an aldehyde and a ketone undergo cross-aldol condensation, it is the \( \alpha-\mathrm{H} \) of ketone which is involved in carbanion formation producing major product.
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