1. Which of following acid highest kpa a) P-Chrobenoic Acid. b) P-Nitrobenzoic A
ID: 1002313 • Letter: 1
Question
1. Which of following acid highest kpa a) P-Chrobenoic Acid. b) P-Nitrobenzoic Acid. c) Bennoic Acid, d) P-Toulic Acid 2. All of the following are reducing disaccharides except a) sucrose, b) cellobiose, c) lactose, d) maltose 3. the product of the bayer villoger reaction is an a) Acid, B) Ester, C) Ether, D) Amibe 4. The reaction of a Grignard reagent with _____ can yield a_____ alchol a) An ester/3 b) Formaldehyde/3 c) An acylhalode/2 d) No Answer 5. one of the principle product of the Cannizzaro reaction is a) Acid, b) ester, c) anhydribe, d) Keytone 6. The reaction between an ester and ammonia will yield an a) Amide, b) imide, c) imine, d) amideExplanation / Answer
1. p-toluic acid will have highest pKa because it is the weakest acid out of the given compounds. Methyl group is electron releasing group, so it will destabilise the carboxylate group and decrease the acidity. However, nitro and chloro groups are electron withdrawing groups, so they will increase the acidity of carboxylate ion. Answer is d.
2. Cellobiose, lactose and maltose are reducing disaccharide but sucrose is not. The cabon linking the glucose and fructose in sucrose is not free to open and reduce metal ion. Thus, it is not a reducing sugar. Answer is a.
3. The product in baeyer villiger is an ester. It is an oxidation with the cleavage of C-C bond adjacent to carbonyl leading to esters. Answer is B.
4. The reaction of a grignard reagent with ester can yield 3o alcohol. However, reaction of a grignard reagent with formaldehyde can yield 1o alcohol and it reacts with acyl halide to give ketone. So, answer is a.
5. one of the principle product of the Cannizzaro reaction is acid. the products formed from Cannizaro reaction are alcohol and carboxylic acid. But major product is acid. Answer is a.
6. The reaction between an ester and ammonia will yield an amide. Alcohol is also formed in the reaction. So, answer is a.
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