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Which of the following are examples of a...

Which of the following are examples of aldol condensation ?
1.`2CH_(3)CHOoverset(dil. NaOH)to CH_(3)CHOHCH_(2)CHO` . `2CH_(3)COCH_(3)overset(dil. NaOH)to CH_(3)COCH(CH_(3))CH_(2)COCH_(3)`
3. `2HCHOoverset(dil. NaOH)to CH_(3)OH+HCOOH`
4. `C_(6)H_(5)CHO+HCHOoverset(dil. NaOH)toC_(6)H_(5)CH_(2)OH`

A

2,3

B

1 , 3

C

1 , 2

D

1,2,3

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The correct Answer is:
( C)
1,2 are aldol condensation due to presence of alpha hydrogen.
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