Which of the following best describes the order of decreasing acid strength for

Question

Which of the following best describes the order of decreasing acid strength for the three carboxylic acids? A) CH_3COOH > CHCbCOOH > CH_2CICOOH B) CHCl_2COOH > CH_2CICOOH > CH_3COOH C) CH_3COOH > CH_2CICOOH > CHCl_2COOH D) CHCI_2COOH > CH_COOH > CH_2CICOOH E) Insufficient information is provided to make a decision. 20) Which one of the following molecules would you expect to be the strongest base? A) (CH_3)_3N B) CH_3NH_2 C) (CH_3)_NH D) NH_3 E) All four molecules have the same pK_b.

Explanation / Answer

17. Ans B

More electron withdrawing group increases acidity. Cl is electron withdrawing group. More number of Cl atom pools electron density towards themself which available H easily to donate and increases acidity.

18. Ans C

Secondary amines are more basic than primary then tertiary.

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