10 Minutes Review Quiz 3 PDF

**10 Minutes Quiz [Answers]** **1.C 2.C 3 B 4D 5D 6B 7B 8C 9B 10C** 1 Compound X will decolourise a warm acidified solution of manganate(VII) ions and forms orange crystals on reaction with 2,4-dinitrophenylhydrazine. What is X? A. CH~3~CH=CHCH~2~OH B. CH~3~COCH~2~CH~3~ C. CH~3~CH~2~CH~2~CHO...

**10 Minutes Quiz [Answers]** **1.C 2.C 3 B 4D 5D 6B 7B 8C 9B 10C** 1 Compound X will decolourise a warm acidified solution of manganate(VII) ions and forms orange crystals on reaction with 2,4-dinitrophenylhydrazine. What is X? A. CH~3~CH=CHCH~2~OH B. CH~3~COCH~2~CH~3~ C. CH~3~CH~2~CH~2~CHO D. CH~3~CH(OH)CH~2~CO~2~H 2 Which compound would undergo nucleophilic addition? A. ethene, C~2~H~4~ B. bromoethane, C~2~H~5~Br C. ethanal, CH~3~CHO D. ethane, C~2~H~6~ 3 Which formula represents the organic compound formed by the reaction of propanoic acid with methanol in the presence of concentrated sulphuric acid as a catalyst? A. CH~3~CH~2~COCH~3~ B. CH~3~CH~2~CO~2~CH~3~ C. CH~3~CO~2~CH~2~CH~3~ D. CH~3~CH~2~CH~2~CO~2~CH~3~ 4 Compound X changes the colour of warm acidified sodium dichromate(VI) from orange to green. 1 mol of X reacts with 2mol of HCN in the presence of KCN. What could X be? A. CH~3~CH~2~CH~2~CHO B. CH~3~COCH~2~COCH~3~ C. H~2~C=CHCH~2~CHO D. OHCCH~2~CH~2~CHO 5 Which formula represents an ester which will form sodium ethanoate on hydrolysis with aqueous sodium hydroxide? 6 A compound Y is treated with warm acidified potassium dichromate(VI). The resulting organic product gives an orange precipitate with 2,4-dinitrophenylhydrazine reagent but does not give a silver mirror with Tollens' reagent. What is Y? A. butan-1-ol B. butan-2-ol C. butanal D. 2-methylpropan-2-ol 7 Aldehydes and ketones are carbonyl compounds. Which of them react with NaBH4 and react with Fehling's reagent? A. both aldehydes and ketones B. aldehydes only C. ketones only D. neither aldehydes nor ketones 8 The ester CH~3~CH~2~CH~2~CO~2~CH~3~ is responsible for the aroma of apples. When this ester is hydrolysed by acid in the stomach, what is the empirical formula of the organic acid produced? A. CH~2~O B. CH~4~O C. C~2~H~4~O D. C~3~H~6~O~2~ 9 Hydroxyethanal, HOCH~2~CHO, is heated under reflux with an excess of acidified potassium dichromate(VI) until no further oxidation takes place. What is the skeletal formula of the organic product?  10 An ester with an odour of banana has the following formula. Which pair of reactants under suitable conditions, will produce this ester?