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Chemistry Test 281
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Chemistry Test 281
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  • Question 1/10
    4 / -1

    What is the name of the following compound?

    CH3CH2COCI

    Solutions

    It consists of three carbon atoms in the parent chain and chloroformyl group (-COCI)

    In the IUPAC name, the suffix "oyl chloride" is added. Therefore, the IUPAC name will be propanoyl chloride.

     

  • Question 2/10
    4 / -1

    Identify the product for the following reaction.

    CH ≡ CH + HOCI →

    Solutions

    HOCI → OH- + CI+

    CI+ shall attack acetylene as an electrophile and OH- will end the addition with a nucleophilic addition. Therefore, the final reaction will be:

     

  • Question 3/10
    4 / -1

    Which of the following names is correct for 

    Solutions

    Since there are three carbon atoms in long chain and it contains 3 -CHO groups (one on each carbon atom). 

    IUPAC suffix "aldehyde" will added due to presence of functional group -CHO.

    Therefore, the correct IUPAC name will be propane-1, 2, 3-tricarbaldehyde.

     

  • Question 4/10
    4 / -1

    Propanal on treatment with dilute sodium hydroxide gives:

    Solutions

    An alpha (α) hydrogen is the hydrogen which is bonded to alpha carbon. Alpha carbon is the first carbon which is bonded to the functional group. As propanal contains alpha hydrogen, it undergoes self aldol condensation to give beta hydroxy (aldol) compound. The reaction is as follows:

     

  • Question 5/10
    4 / -1

    Which of the following organic compounds does not undergo diazotisation?

    Solutions

    Benzylamine, on reaction with nitrous acid, gives unstable diazonium salt which in turn gives alcohol with a gas, that is nitrogen as shown below:

     

  • Question 6/10
    4 / -1

    The coupling of diazonium salt of 4-amino benzene sulphonic acid with N, N-dimethyl benzamine produces

    Solutions

    The coupling of diazonium salt of 4-aminobenzene sulphonic acid with N, N-dimethyl benzamine produces methyl orange.

     

  • Question 7/10
    4 / -1

    Which among the following statements is incorrect?

    Solutions

    Tertiary amines do not have any hydrogen atom attached directly to the nitrogen and hence, do not exhibit hydrogen bonding. Hence, the option (c) is incorrect.

     

  • Question 8/10
    4 / -1

    Which of the following compounds give carbylamine reaction?

    Solutions

    The carbylamine reaction (also known as the Hoffmann Isocyanide Synthesis) is the synthesis of an isocyanide by the reaction of a primary amine, chloroform, and base.

    CH3NH2 + 3KOH + CHCl3 →CH3NC + 3KCl + 3H2O

     

  • Question 9/10
    4 / -1

    Which of the following indicates open chain structure of glucose?

    Solutions

    Pentacetyl formation of glucose indicates that the latter contain 5–OH groups, indicating the open chain structure of glucose.

     

  • Question 10/10
    4 / -1

    The numbers of stereo centres present in linear and cyclic structures of glucose are respectively:

    Solutions

    The number of stereo centres in the linear structure of glucose is 4 and in the cyclic structure is 5.

     

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