8. Which of the following anions is the strongest base? a. NH2 b. NH3 c. CH3CH-N

Question

8. Which of the following anions is the strongest base? a. NH2 b. NH3 c. CH3CH-N d. CHaCEN 9. Which of the following are ethers? a. only 1 and 2 b. only 1 and 4 c. only 1, 2 and 3 d. 1, 2, 3 and 4 10. In the following reaction in aqueous solution, the acid reactant is and its conjugate base product is CH3COOH+NH3CH,COO+NH a. CH3COOH; CH3C0O b. CH3COOH; NH4 c. NHs; CH3CO0 d. NH3; NH4 e. CH3COOH; H30 11. Three acids found in foods are lactic acid (in milk products), oxalic acid (in rhubarb). and malic acid (in apples). The pKa values are LA 3.88, OA 1.23, and MA-3.40. Which list has these acids in order of decreasing acid strength? a, LA > OA>MA b. LA> MA>OA C. OA> MA> LA d. OA> LA> MA e. MA> LA> OA

Explanation / Answer

8. Comparing among the options, a and c are more basic than the other two because they have a negative charge and can accept proton more quickly than b and d. So, the options b and d are eliminated. Now, between a and c, NH2- is more basic. This is so because its conjugate acid is ammonia and that of CH3CH=N- is an imine. Since imines are more acidic than amines, so, the conjugate base of imine will be less basic. Hence the answer is a .   

9. All the compounds shown are ethers. The general formula for ethers is R-O-R . Hence the answer is d .

10. The compound which gives a proton is called an acid. In the given reaction, CH3COOH is giving the proton. So, it is the acid and its conjugate base is CH3COO- . So, the answer is a.    11. The lower the pKa value, the more easily it gives a proton which means if pKa value is low, the acidic strength will be high.

The pKa values are in the order:: LA>MA>OA   

So, the acidic strength will be in the order:: OA>MA>LA , that is, option c.

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