Which of the following has most acidic hydrogen atom:
Correct answer: C. CH3COCH2CHO
- A. CH3CHO
- B. CH3COCH3
- C. CH3COCH2CHO
- D. CH3COCH2COOCH3
Explanation
Hydrogen atoms present at alpha-position to any electron withdrawing substituent are acidic in nature. The acidity of alpha-hydrogens increases if they are surrounded by electron withdrawing groups on both sides. So, active methylene group containing compounds have more acidic hydrogens when adjacent groups are aldehyde and ketonic with respect to compounds containing ester and ketonic groups.
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About Aldehydes and Ketones
Aldehydes and ketones contain the polar carbonyl group, but aldehydes are generally more readily oxidised and more reactive than ketones. Coverage includes preparation by oxidation or reduction routes, nucleophilic addition of reagents such as hydrogen cyanide and bisulfite, and tests that distinguish aldehydes from ketones.
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