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Carbonyl Compounds Model Question Paper 1

12th Standard EM

    Reg.No. :
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Chemistry

Time : 01:00:00 Hrs
Total Marks : 50
    5 x 1 = 5
  1. In the following reaction, \(HC\equiv \overset { { H }_{ 2 }{ SO }_{ 4 } }{ \underset { HgS{ O }_{ 4 } }{ \longrightarrow } } X\) Product ‘X’ will not give

    (a)

    Tollen’s test

    (b)

    Victor meyer test

    (c)

    Iodoform test

    (d)

    Fehling test

  2. Assertion: 2,2 – dimethyl propanoic acid does not give HVZ reaction.
    Reason: 2 – 2, dimethyl propanoic acid does not have – - hydrogen atom

    (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

  3. Which one of the following reduces tollens reagent

    (a)

    formic acid

    (b)

    acetic acid

    (c)

    benzophenone

    (d)

    none of these

  4. Which among the following on oxidation with alk.KMnO4 will give butanone?

    (a)

    Butan -1- ol

    (b)

    Butan - 2-ol

    (c)

    Both (a) and (b)

    (d)

    Neither (a) nor (b)

  5. Which of the following acids do not exhibit optical isomerism?

    (a)

    lactic acid

    (b)

    tartaric acid

    (c)

    maleic acid

    (d)

    both (a) and (b)

  6. 5 x 2 = 10
  7. Identify X and Y.
    \({ CH }_{ 3 }CO{ CH }_{ 2 }{ CH }_{ 2 }COO{ C }_{ 2 }{ H }_{ 5 }\overset { { CH }_{ 3 }MBgr }{ \longrightarrow } X\overset { { H }_{ 3 }{ O }^{ + } }{ \longrightarrow } Y\)

  8. What is angle of deviation due to reflection?

  9. What happens when calcium acetate is dry distilled?

  10. Arrange the following in increasing order of reactivity towards nucleophilic addition HCHO) CH3CHO and CH3COCH3

  11. Benzaldehyde reduces Tollen's reagent but not Fehling's solution explain.

  12. 5 x 3 = 15
  13. An alkene (A) on ozonolysis gives propanone and aldehyde (B). When (B) is oxidised (C) is obtained. (C) is treated with BriP gives (D) which on hydrolysis gives (E). When propanone is treated with HCN followed by hydrolysis gives (E). Identify A) B) C) D and E.

  14. A carbonyl compound A having molecular formula C5H10O forms crystalline precipitate with sodium bisulphate and gives positive iodoform test. A does not reduce Fehling solution. XII Identify A.

  15. How is acetaldehyde prepared by the ozonolysis of CH3CH=CHCH3?

  16. Formaldehyde and benzaldehyde give Cannizaro reaction but acetaldehyde does not - account for this.

  17. How is carboxylic acid prepared from alcohols?

  18. 4 x 5 = 20
  19. Write the structure of the major product of the aldol condensation of benzaldehyde with acetone.

  20. Complete the following reaction
    \({ CH }_{ 3 }-{ CH }_{ 2 }-{ CH }_{ 2 }-\underset { \overset { || }{ O } }{ C } -{ CH }_{ 3 }\overset { HO-{ CH }_{ 2 }-{ CH }_{ 2 }-OH }{ \underset { { H }^{ + } }{ \longrightarrow } } ?\)

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

  22. An organic compound A (C7H6O) forms a bisulphite. A when treated with alcoholic KCN forms B (C14H12O2) and A on refluxing with sodium acetate and acetic anhydride forms an add C (C9HsO2). Identify A, B and C. Explain the conversion of A to Band C.

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