Tiêu đề 12. ALDEHYDES KETONES AND CARBOXYLIC ACIDS.pdf ✅

(3.) Correct order of reactivity towards nucleophile: (1) a  b  c  d (2) c a b d    (3) c b a d    (4) d a b c    (4.) 3 2 D.M.S.O CH CH CH A B Peroxide − = ⎯ ⎯⎯⎯⎯⎯→ ⎯⎯⎯⎯→ Which statement is correct for compound B : (1) Compound ' B ' is CH CH CHO 3 2 − − give red ppt with fehling solution (2) Compound ' B ' is give no ppt with Fehling solution. (3) Compound ' B ' is CH CH OH 3 2 − − give red color in victor Meyer test. (4) None of these (5.) Which will not react with Schiff reagent : (1) C H CHO 6 5 (2) (3) CH CHO 3 − (4) Both 1 and 3 (6.) When a mixture of calcium acetate and calcium format is heated, it yields : (1) acetone (2) acetaldehyde (3) benzaldehyde (4) acetophenone

(1) Mg Hg H O2 (2) Na , Liq. NH3 (3) NaBH4 (4) NH NH &C H ONa 2 2 2 5 (13.) CH CHO 3 and C H CH CHO 6 5 2 can be distinguished chemically by : (1) Benedict's test (2) iodoform test (3) Tollen's reagent test (4) Fehling's solution test (14.) A mixture of benzaldehyde and formaldehyde on heating with aqueous NaOH solution gives : (1) benzyl alcohol and sodiumformate (2) sodium benzoate and methyl alcohol (3) sodium benzoate and sodiumformate (4) benzyl alcohol and methyl alcohol (15.) ( ) ( ) ( ) LiAlH4 3 dilute NaOH / Δ O / Zn / H O 3 2 CH COOH A B C D E 300 C ⎯⎯⎯→ ⎯⎯⎯⎯→ ⎯⎯⎯⎯⎯⎯⎯⎯→ ⎯⎯⎯⎯⎯⎯⎯→ + In the above reaction, D and E are respectively : (1) CH CHO 3 and CHO CHO − (2) CH COOH 3 and CHO CHO − (3) CH CHO 3 and CH CH OH 3 2 − (4) none of these (16.) Aldol condensation does not occur between : (1) two different aldehydes (2) two different ketones (3) an aldehyde and a ketone (4) an aldehyde and an ester (17.) 3 Cl2 50% aq. NaOH CH CHO A B − ⎯⎯⎯→ ⎯⎯⎯⎯⎯⎯⎯→ + Salt Salt Compound B is : (1) 2,2,2-trichloroethanol (2) trichloromethanol (3) 2,2,2-trichloropropanol (4) chloroform