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Carbonyl Compounds Model Question Paper

12th Standard EM

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 40
    14 x 1 = 14
  1. Reaction of acetone with one of the following reagents involves nucleophilic addition followed by elimination of water. The reagent is

    (a)

    Grignard reagent

    (b)

    Sn / HCl

    (c)

    hydrazine in presence of slightly acidic solution

    (d)

    hydrocyanic acid

  2. Which one of the following reduces tollens reagent

    (a)

    formic acid

    (b)

    acetic acid

    (c)

    benzophenone

    (d)

    none of these

  3. Assertion : p – N, N – dimethyl aminobenzaldehyde undergoes benzoin condensation
    Reason : The aldehydic (-CHO) group is meta directing

    (a)

    if both assertion and reason are true and reason is the correct explanation of assertion.

    (b)

    if both assertion and reason are true but reason is not the correct explanation of assertion.

    (c)

    assertion is true but reason is false

    (d)

    both assertion and reason are false

  4. Of the following, which is the product formed when cyclohexanone undergoes aldol condensation followed by heating?

    (a)

    (b)

    (c)

    (d)

  5. Identify 'X'.

    (a)

    (b)

    (c)

    (d)

  6. Methyl ketones are usually characterised by

    (a)

    the Fehling's solution

    (b)

    the iodoform test

    (c)

    the Schiff's test

    (d)

    the Tollen's reagent

  7. Which of the following does not give iodoform test?

    (a)

    aceto phenone

    (b)

    benzophenone

    (c)

    \({ CH }_{ 3 }-\underset { \overset { | }{ { CH }_{ 3 } } }{ CHOH } \)

    (d)

    \({ CH }_{ 3 }-\underset { \overset { | }{ OH } }{ CH } -{ { CH }_{ 2 }{ CH }_{ 2 }-CH }_{ 3 }\)

  8. Which one of the following gives oxime with hydroxyl amine?

    (a)

    Benzene

    (b)

    Phenol

    (c)

    Benzaldehyde

    (d)

    Bezoicacid

  9. Chloroacetic acid is stronger than acetic acid due to

    (a)

    + I effect

    (b)

    - I effect

    (c)

    +M effect

    (d)

    -M effect

  10. 6 - 8% solution of acetic acid in water is called __________.

    (a)

    Vinegar

    (b)

    Glacial acetic acid

    (c)

    Formalin

    (d)

    Both (a) and (b)

  11. Aldehydes and ketones are reduced to hydrocarbons by zinc amalgam and cone.HCI. This is__________ reaction.

    (a)

    Clemmenson's reduction

    (b)

    Wolff krishner reduction

    (c)

    Rosenmmunds reduction

    (d)

    catalytic reduction

  12. The aldehyde derived from vitamin B6 is __________.

    (a)

    pyridoxal

    (b)

    pyridoxine

    (c)

    CH3CHO

    (d)

    glyoxal

  13. The product is __________.

    (a)

    CO+H2O

    (b)

    HCOOH

    (c)

    H2+CO2

    (d)

    HCHO+O2

  14. The order of reactivity of carboxylic acid derivatives is _______

    (a)

    Acid chloride > Ester > Amide > Acid anhydride

    (b)

    Acid chloride > Acid anhydride > Ester > Amide

    (c)

    Acid chloride> Amide> Acid anhydride> Ester

    (d)

    Acid anhydride > Ester> Amide> Acid chloride

  15. 2 x 2 = 4
  16. Assertion: Formic acid reduces Tollens reagent.
    Reason: Formic acid contains an aldehyde as well as acid group.
    a) (A) and (R) are true and (R) is the correct explanation of (A)
    b) Both (A) and (R) are true but (R) does not explain (A)
    c) (A) is true but (R) is false
    d) Both (A) and (R) are false

  17. Assertion: Ethyl benzene and methyl benzene both are oxidised to benzoic acid with acidified KMnO4.
    Reason: The entire side chain of aromatic carboxylic acid is oxidised to COOH irrespective of the length of the side chain.
    a) (A) and (R) are true and (R) is the correct explanation of (A)
    b) Both (A) and (R) are true but (R) does not explain (A)
    c) (A) is true but (R) is false
    d) Both (A) and (R) are false

  18. 3 x 2 = 6
  19. A Compound (A) with molecular formula C2H3N on acid hydrolysis gives(B) which reacts with thionylchloride to give compound(C). Benzene reacts with compound (C) in presence of anhydrous AlCl3 to give compound(C). Compound (C) on reduction with gives (D). Identify (A), (B), (C) and D. Write the equations.

  20. What type of aldehydes undergo Cannizaro reaction?

  21. Write any three uses of acetaldehyde.

  22. 2 x 3 = 6
  23. How will you convert benzaldehyde into the following compounds?
    (i) benzophenone
    (ii) benzoic acid
    (iii) hydroxyphenylaceticacid.

  24. An organic compound, C2H4O gives a red precipitate when warmed with Fehling's solution. It also undergoes aldol condensation in presence of alkali.
    (i) Write IUPACname of the compound.
    (ii) Predict the hybridization of carbon atoms in the compound?
    (iii) Write equation for the reaction

  25. 2 x 5 = 10
  26. Complete the following reaction
    \({ CH }_{ 3 }-{ CH }_{ 2 }-{ CH }_{ 2 }-\underset { \overset { || }{ O } }{ C } -{ CH }_{ 3 }\overset { HO-{ CH }_{ 2 }-{ CH }_{ 2 }-OH }{ \underset { { H }^{ + } }{ \longrightarrow } } ?\)

  27. Explain why carboxylic acids behave as acids. Discuss briefly the effects of electron withdrawing and donating substituents on acid strength of carboxylic acids.

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