Circle or darken the letter that corresponds to the BEST answer. There is only o

Question

Circle or darken the letter that corresponds to the BEST answer. There is only one BEST answer for each question. 1. What is the IUPAC name of the compound below? (a) 1-chloropentanamide (b) 5-chloropentanamide (c) 1 -chloro-N-methylbutanamide (d) 4-chloro-N-methylbutanamide 2. Which one of these carboxylic acids will have the lowest pK_a-value? (a) CH_3CO_2H (b)CH_3CH_2CO_2H (c) O_2NCH_2CO_2H (d) BrCH_2CO_2H 3. In the pmr spectrum of propanoic acid, the signal at what chemical shift will disappear if a drop of D_2O is added to the sample. (a) 1.16 ppm (b) 2.38 ppm (c) 7.35 ppm (d) 11.73ppm

Explanation / Answer

1. correct option (d)

2. correct option (c): Because presence of strong electron withdrawing group -NO2 it will stabilize its conjugate base. Hence, lowes pKa (strongest acid among these)

3. correct option (d): Only acidic protons (O-H) will be easily exchanged with D2O.

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