ECAT Chemistry Chapter 23 Aldehydes and Ketones Online Test With Answers

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ECAT Chemistry Chapter 23 Aldehydes and Ketones Online Test

Sr. # Questions Answers Choice
1 A compound A has a molecular formula C2Cl3OH. It reduces Fehling solution and on oxidation produces a monocarboxylic acid B.A can also be obtained by the action of Cl2on Ethanol. A is Chloral hydrate CHCl<sub>3</sub> CH<sub>3</sub>Cl Chloroacetic acid
2 Self condensation of acetaldehyde in the presence of dilute alkalies gives An acetal An aldol Mesitylene Propionaldehyde
3 Which of the following does not react with phenyl hydrazine? Ethanol Ethanal Acetone Acetophenone
4 A nucleophilic reagent will readily Attack Ethylene Ethanal Ethanol Ethylamine
5 When vapours of isopropyl alcohol are passed over heated copper, the major product obtained is Propane Propylene Acetaldehyde Acetone
6 Which of the following is hypnotic? Acetaldehyde Metaldehyde Paraldehyde None
7 Wacker method involves the conversion of alkene using PdCl2into corresponding Alcohol Ketone Aldehyde Ether
8 Which of the following gives iodoform on heating with a solution of I2containing Na2CO3? Ethyl alcohol Acetone Ethyl alcohol as well as acetone Methyl alcohol
9 Aldehydes can be distinguished from ketones by using Schiff's reagent Conc. H<sub>2</sub>SO<sub>4</sub> Anhy. ZnCl<sub>2</sub> Resorcinol
10 Aromatic aldehydes undergo disproportionation in presence of sodium or potassium hydroxide to give corresponding alcohol and acid. The reaction is known as Wurtz reaction Cannizzaro reaction Friedel Craft reaction Claisen reaction
11 Which of the following does not turn Schiff's reagent to pink? Formaldehyde Bezaldehyde Aceton Methyl chloride
12 At room temperature formaldehyde is Gas Liquid Solid None of the above
13 Cannizzaro reaction is not given by Trimethyl acetaldehyde Acetaldehyde Benzaldehyde Formaldehyde
14 On heating acetaldehyde with ammonical silver nitrate solution, we get CH<sub>3</sub>OH Silver acetate HCHO Silver mirror
15 Aldehydes are produce in atmosphere by Oxidation of secondary alcohols Reduction of alkenes Reaction of oxygen atoms with hydrocarbons Reaction of oxygen atoms with ozone
16 Propyne on hydrolysis in presence of H2SO4and HgSO4gives Acetaldehyde Acetone Formaldehyde None
17 Tollen's reagent is Ammonical cuprous chloride Ammonical cuprous oxide Ammonical silver bromide Ammonical silver nitrate
18 Which of the following reactions is used for detecting presence of carbonyl group? Reaction with hydroxylamine Reaction with hydrazine Reaction with phenyl hydrazine All
19 Which of the following alcohols cannot be produced by treatment of aldehydes or ketones with NaBH4or LiAIH4? 1-propanol 2-propanol 2-Methyl-2-propanol Ethanol
20 Calcium acetate when dry distilled gives Formaldehyde Acetaldehyde Acetone Acetic anhydride
21 Isopropyl alcohol on oxidation forms Acetone Ether Ethylene Acetaldehyde
22 A common industrial solvent is a mixture of propanone; CH3COCH3, and pentyl ethanoate CH3CO2(CH2)4CH3. Which reagent would have no effect on this solvent Na<sub>(s)</sub> NaBH<sub>4</sub> NaOH<sub>(aq)</sub> 2,4-dinitrophenylhydrazine reagent
23 Which of these reactions is shown by buranone, CH3COCH2CH3 On warming with acidified potassium dichromative (IV) the solution turns green On heating with Fehling's reagent a red precipitate is formed With 2,4-dinitrophenlhydrazine reagent an orange precipitate is formed With hydrogen cyanide an aldehyde is formed
24 With H<sub>2</sub>/Ni CH<sub>3</sub>(CH<sub>2</sub>)<sub>5</sub>CH<sub>2</sub>OH With H<sub>2</sub>/Ni CH<sub>3</sub>(CH<sub>2</sub>)<sub>5</sub>CH<sub>3</sub> With NaBH<sub>4</sub> CH<sub>3</sub>(CH<sub>2</sub>)<sub>5</sub>CH<sub>2</sub>OH With NaBH<sub>4</sub> CH<sub>3</sub>(CH<sub>2</sub>)<sub>5</sub>CHO
25 Q and R Q and R R only Q and R Q and R R only Q only R only
26 Which compound would undergo nucleophilic addition Ethene, C<sub>2</sub>H<sub>4</sub> Bromoethane, C<sub>2</sub>H<sub>5</sub>Br Ethanal, CH<sub>3</sub>CHO Ethane, C<sub>2</sub>H<sub>6</sub>
27 Ethanal may be converted into a three-carbon acid in a two-step process.
Which compound is the intermediate
 CH<sub>3</sub>CO<sub>2</sub>H CH<sub>3</sub>CN CH<sub>3</sub>CH<sub>2</sub>CN CH<sub>3</sub>CH(OH)CN
28 A compound R has all of the following properties. It is neutral; It gives an orange precipitate with 2,4-dinitrophenythydrazine; it evolves hydrogen chloride when treated with PCI5in the cold What could R be
29 Which compound on reaction with hydrogen cyanide produces a compound with a chiral centre Ch<sub>3</sub>CHO CH<sub>3</sub>CH<sub>2</sub>COCH<sub>2</sub>CH<sub>3</sub> CH<sub>3</sub>CO<sub>2</sub>CH<sub>3</sub> HCHO
30 Aldehydes and ketones are carbonyl compounds. Which of them react both with NaBH4and with Tollen's reagent Both aldehydes and ketones Aldehydes only Ketones only Neither aldehydes nor ketones
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