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Aldehydes Ketones and Carboxylic Acids Test - 8

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Aldehydes Ketones and Carboxylic Acids Test - 8
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  • Question 1
    1 / -0

    Which of the following reagents can be used to convert a carboxylic acid directly into its corresponding acid chloride derivative?

    Solution

    Acid reacts with SOCl2 or (COCl)2 and gets converted to acid chloride. With (COCl)2  room temperature is required.

    RCOOH + (COCl)2 → RCOCl

  • Question 2
    1 / -0

    What compound is produced when cyclohexene is treated with concentrated KMnO4?

    Solution

    Conc KMnO4 will cause oxidative ozonolysis  and ring opening forming adipic acid.
    cyclohexene +  conc. KMnO4  →  HOOC(CH2)4COOH

  • Question 3
    1 / -0

    How  to do the following conversion :
    RCOOCl + ?  → RCHO

    Solution

    Catalytic hydrogenation of acid chloride using H2-Pd, BaSO4 converts acid chloride selectively to aldehydes. This is known as Rosenmud Reduction.

  • Question 4
    1 / -0

    The common name for pentanedioic acid is:

    Solution

    Pentanedioic acid is known as glutaric acid.

    (COOH)2 is known as oxalic acid.

    Butanedioic acid is known as succinic acid.

    hexanedioic acid is known as adipic acid.

    heptanedioic acid is known as pimelic acid.

  • Question 5
    1 / -0

    Many naturally occurring aldehydes and ketones are used in the blending of perfumes and flavouring agents. But the preferred ones are

    Solution

    Higher aldehydes like aldehyde C-10 etc are used in floral blends like rose, jasmine etc.

  • Question 6
    1 / -0

    In perfumes, the fragrance of the aldehyde and ketone used for perfume and similar uses depend on

    Solution

    Size and solubility of aldehyde and Ketone determines fragrance. For example aldehyde C-10 is used in floral blends like rose, jasmine while aldehyde C-11 has strong citrus smell and aldehyde C-16 has strong strawberry smell.

  • Question 7
    1 / -0

    IUPAC name of CH3CHO is

    Solution

    CH3CHO is ethanal as we have two carbons in main chain so, the word root is 'Eth' and the functional group is aldehydic group so, suffix is 'al'. Hence, IUPAC name will be Ethanal.

  • Question 8
    1 / -0

    Benzaldehyde and acetone can be best distinguished using

    Solution

    Tollen's Test is used to distinguish between and aldehyde and ketone. It uses the fact that aldehydes are easily oxidised to their corresponding acids while ketones are not.

    Tollen's reagent are aqueous ammonical silver nitrate solution which react with aldehydes as shown.

    RCHO + 2Ag+ + 2OH-  →  RCOO- + Ag + H2O.

    RCOR + 2Ag+ + 2OH  → No reaction

    If this test is carried in glass tube, the Ag formed forms a mirror on the sides of test tube so the test is also known as silver mirror test. 

    Aldehydes show tollen’s test while acetone which is a ketone does not give tollen’s test.

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