MCQs - Set V - Aldehydes and ketones

Aldehydes and Ketones

1.An organic compound ‘A’, has molecular formula C₄H₈O. A on oxidation gives acid with same number of carbon atoms.Which of the following statements is not true about A:-

a.    It shows positive Tollens test

b.    It gives primary alcohol on reduction.

c.    It gives positive Iodoform test

d.   It does not show Cannizoro’s reaction.

2.  Which of the following reagents can be used to convert acetone to Isopropyl alcohol :

            a. HI /red P/200°C

            b. NH₂-NH₂ / KOH

            c. NaBH₄

            d. Zn / HCl

3. Which of the following tests is positive for Methyl ketone:-

            a. Tollen’s test

            b. Felhing’s test

            c. Schiff’s test

            d. Iodoform test

4. A mixture of benzaldehyde and formaldehyde is treated with conc. NaOH gives:-

            a. Benzyl alcohol and sodium formate

            b. Sodium benzoate and methyl alcohol

            c. Sodium benzoate and sodium formate

            d. Benzyl alcohol and methyl alcohol

5. Ketones  can be obtained in one step by:

            a. Hydrolysis of esters

            b. Oxidation of  primary alcohols

            c. Oxidation of secondary alcohols

            d. Reduction of  primary alcohols

6. Which of the following alcohols cannot be produced by treatment of aldehydes and ketones with NaBH₄ :-

a.    2- Propanol

b.    1-Propanol

c.    2-Methyl-2-propanol

d.   Ethanol

7. The isomer of C₃H₆O which gives a positive Tollens test is:-

a.    Propyl Alcohol

b.    Propanone

c.    1-Methoxy ethane

d.   Propanal

8. In presence of dry HCl gas Ethanal reacts with ethanol to give:-

a.    Trioxane

b.    Aldol

c.    Acetal

d.   Oxime

9. Which of the following is the major product from the reaction ?
CH₃.CO.CH₃ + NH₂CO.NH.NH₂ à

a.   (CH₃)₂C(OH).NH.CO.NH.NH₂

b.   (CH₃)₂C=NCO.NH.NH₂

c.   (CH₃)₂C(OH).NH.NH.CONH₂

d.  (CH₃)₂C=NNHCONH₂

    

10. Benzyl alcohol is obtained from benzaldehyde by:-

            a. Wolff Kishner reduction

            b. Perkins reaction

            c. Claisen Condensation

            d. Cannizaro’s reaction

11. Which of the following reagents cannot be used to convert acetaldehyde to ethane:-

a.       HI /red P/200°C

            b. NH₂-NH₂ / KOH

            c. NaBH₄

            d. Zn / HCl

12.Which of the following reagents can bring about the following conversion:

a.    NaBH₄

b.    LiAlH₄

c.    H₂/Pd/BaSO₄

d.   H₃O⁺

13.Which of the following will give a negative test with Felhings solution?

a.     Acetaldehyde

b.    Formic acid

c.     Benzaldehyde

d.    Formaldehyde

14.Which of the following reagents will not reduce acetone to propane: -

a.   HI/red P

b.   LiAlH₄

c.   Zn-Hg/ HCl

d.  NH₂-NH₂/KOH

15.A compound that gives positive Iodoform test is: -

a.    1-Pentanol

b.   2- Pentanone

c.    Pentanal

d.   3- Pentanone

16.CH₃CHO can be distinguished from HCHO by: -

a.     Silver mirror test

b.     Iodoform test

c.     Aldol test

d.    Felhings test

17.Which of the following alcohols can be produced by hydration of           2-Methyl propene:-

a.       Isopropyl alcohol

b.       Propyl alcohol

c.       Tertiary butyl acohol

d.      Ethyl alcohol

18.The isomer of C₃H₆O which gives a positive Tollens test is:-

a.       Propanal

b.       Propyl Alcohol

c.       Propanone

d.      Methoxy ethane

 19. Among the following compounds, which will react with acetone to give a product containing  >C=N-

a.        C₆H₅NH₂

b.       (CH₃)₃N

c.        C₆H₅NHC₆H₅

d.       C₆H₅NHNH₂

20. Which of the following is most reactive towards nucleophilic addition reactions:-

a.        HCHO    

b.       CH₃CHO

c.        C₂H₅CHO           

d.       CH₃COCH₃