1. Which of the following compounds does not have an alpha hydrogen? B) 11 A) I

Question

1. Which of the following compounds does not have an alpha hydrogen? B) 11 A) I of the above C) III D) IV E) all 2. Which of the labeled hydrogen atoms in the following structure is the most acidic? A) 1 B) 2 C) 3 D) 4 E) 5 3. Which of the following underlined alpha hydrogens are the most acidic? A) B) E) C) D) CH3-C0H3 4. Which of the labeled hydrogen atoms in the following structure is the most acidic? A) 1 B) 2 c) 3 D) 4 E) 5. Which of the following is a B-diester? A) B) C) D) E) CH 3OCCH2COCH3CH 3CCH2CCH 3 CH3CCH2COCH CH30COCH 6. How many Hs in the compound below are replaced by Ds when it is shaken in D20 containing trace hydroxide? Show them on the structure below! B) 2 D) 6 E) 7

Explanation / Answer

1) option E is correct

Explanation: The hydrogens attached to alpha carbon are called alpha hydrogens.

2) option E is correct

Explanation: carboxylic acid proton is most acidic.

3) option B is correct

Explanation: The negative charge produced by the lost of proton is stabilized by resonance with cabonyl group of aldehyde.

4) option D is correct

Explanation: The negative charge produced by the lost of proton is stabilized by resonance with cabonyl group of ketone.

5) option A is correct

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