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Aldehydes, Ketones and Carboxylic Acids Test 12

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Aldehydes, Ketones and Carboxylic Acids Test 12
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  • Question 1
    1 / -0

    Only One Option Correct Type

    Direction (Q. Nos. 1-8) This section contains 8 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.

    Q. 

    Tollen’s reagent used for the distinction of aldehydes with ketones is

    Solution

    Tollen’s reagent is ammoniacal solution of silver nitrate in which silver remains as [Ag(NH3)2]+.

  • Question 2
    1 / -0

    A hydrocarbon X on treatment with O3 followed by the reduction of ozonide with Zn-H2O gives Y. Y gives both Tollen's test as well as yellow precipitate with NaOH/I2 solution. Which is a possible structure of X ?

    Solution


    The above product has both —CHO and —COCH3 groups required for Tolien's test and iodoform test respectively.

  • Question 3
    1 / -0

    Which compound given below does not form red precipitate with ammoniacal solution of Cu(lI) tartarate ?

    Solution

    Fehling's test is not given by benzaldehyde (aromatic aldehyde).

  • Question 4
    1 / -0

    Which reagent can differentiate between benzaldehyde and acetophenone?

    Solution

    Benzaldehyde gives Tolien’s test but acetophenone does not. On the other hand, acetophenone (Ph—COCH3) gives iodoform test but benzaldehyde does not.

  • Question 5
    1 / -0

    Which reagent can be used to separate a mixture of ethanol and butanone into components? 

    Solution

    Butanone forms precipitate with 2, 4-dinitrophenyl hydrazine, which after separation, can be hydrolysed to obtain back the ketone. 

  • Question 6
    1 / -0

    Reagent that can differentiate 2-propanoi from acetone is

    Solution

    Cerric nitrate forms coloured solution with alcohols but does not react with ketone.

  • Question 7
    1 / -0

    Which reagent given below can differentiate propanal from propanone?

    Solution

    Schiff`s test is given by aldehydes but not by ketones

  • Question 8
    1 / -0

    Which of the following would produce an orange coloured precipitate with 2, 4-dinitrophenyl hydrazine?

    Solution

    Conjugated aldehydes and ketones form orange coloured precipitate with 2, 4-dinitrophenyl hydrazine. Non-conjugated carbonyls form yellow precipitate in the same reaction.

  • Question 9
    1 / -0

    CH3CHO and C6H5CH2CHO can be distinguished chemically by:

  • Question 10
    1 / -0

    One mole of an organic compound 'A' with the formula C3H8O reacts completely with two moles of HI to form X and Y. When 'Y' is boiled with aqueous alkali it forms Z. Z answers the iodoform test. The compound 'A' is ______.

  • Question 11
    1 / -0

    Matching List Type

    Direction (Q. No. 21) Choices for the correct combination of elements from Column I and Column II are given as options (a), (b), (c) and (d), out of which one is correct.

    Q.

    Match the qualitative tests listed in Column I with compounds from Column II that gives positive response to these tests and mark the correct option from the codes given below.

    Solution

    (i) Benzaldehyde forms orange precipitate with 2, 4-dinitrophenyl hydrazine while all others form yellow precipitate.
    (ii) Benzaldehyde, being conjugated, forms orange precipitate with 2, 4-dinitrophenyl hydrazine.
    (iii) Aldehydes (aliphatic) and a-hydroxy ketones are oxidised by Fehling's solution giving red precipitate of Cu2O. (iv) NaHSO3 forms white precipitate of bisulphite with all carbonyls. 

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