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Organic Chemistry - Some Basic Principles and Techniques Test - 4

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Organic Chemistry - Some Basic Principles and Techniques Test - 4
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Directions: The following question has four choices out of which ONLY ONE is correct.

    An organic compound having molecular mass 60 g is found to contain C = 20%, H = 6.67% and N = 46.67% while the rest is oxygen. On heating, it gives NH3 along with a solid residue. The solid residue gives violet colour with alkaline copper sulphate solution. The compound is
  • Question 2
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    2-bromo butane can be represented in various ways. Choose the incorrect one from the following

    Solution

    Methyl group is represented at 3rd carbon no bromine is there on 2nd carbon

  • Question 3
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    In π (pi) bond formation, one of the below criteria is necessary. Choose the appropriate one.

    Solution

    Parallel orientation of p orbitals on adjacent atoms is necessary for side-ways overlapping and formation of π bond.

  • Question 4
    1 / -0
    Directions: The following question has four choices out of which ONLY ONE is correct.

    An isopropyl group has molecular formula C3H7 –. In their structure, two methyl groups are attached to a carbon containing one hydrogen atom and this group is attached to carbon chain.
    Which of the following organic compounds belongs to this category?
  • Question 5
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    Change in hybridisation affects the carbon’s and the organic compound’s

    Solution

    in hybridization as % of 's'character increases electronegativity also increases.

    more the s charater, more will be the electronegativity of that atom.

    increasing order ofelectronegativity  with %s character is sp (50%) >  sp2(33.33%) >  sp3(25%)

  • Question 6
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    Delocalisation of σ-electrons of C -H bond of an alkyl group directly attached to an atom of unsaturated system or to an atom with an unshared p-orbital is called :

    Solution

    The interaction of the electrons in a sigma bond (usually C–H or C–C) with an adjacent empty (or partially filled) non-bonding p-orbital, antibonding σ or π orbital,or filled π orbital, to give an extended molecular orbital that increases the stability of the system is Hyperconjugation.

  • Question 7
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    Which of the following statements about resonance is not true?
  • Question 8
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    Hybridisation in methane (CH4), ethene (C2H4), ethyne (C2H2) involves s and p orbitals. Choose the correct hybrid orbitals in the options given below for CH4, C2H4 and, C2H2 respectively

    Solution

    In methane C is sp3 hybridised because of 3 sigma bond formation. While in ethane both the C are sp2 hybridised, and in ethyne both the C are sp hybridised.

  • Question 9
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    Which of the following is not an aromatic compound?
  • Question 10
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    Identify the main source(s) of organic compounds.
  • Question 11
    1 / -0
    The process of differential extraction is based on
  • Question 12
    1 / -0
    Which of the following singlet carbenes is the most stable?
  • Question 13
    1 / -0
    Orbital interaction between -bonds of a substituent group and a neighbouring  orbital is known as
  • Question 14
    1 / -0
    The minimum number of carbon atoms necessary for a hydrocarbon to form a branched structure is
  • Question 15
    1 / -0
    The correct order of bond energies of the following bonds is

    (I) C(sp3) - C(sp3), (II) C(sp2) - C(sp2), (III) C(sp) - C(sp)
  • Question 16
    1 / -0
    When phenol is treated with CHCl3 and NaOH, the product formed is 
  • Question 17
    1 / -0
    Directions: The following question has four choices out of which ONLY ONE is correct.

    What is the product obtained when chlorine reacts with ethyl alcohol in the presence of NaOH?
  • Question 18
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    In which of the following states is carbon most electronegative?
  • Question 19
    1 / -0
    The shifting of electrons of a multiple bond under the influence of a reagent is called
  • Question 20
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    Directions: The following question has four choices out of which ONLY ONE is correct.

    The ammonia evolved from the treatment of 0.30 g of an organic compound for the estimation of nitrogen was passed through 100 ml of 0.1 M sulphuric acid. The excess of acid required 20 ml of 0.5 M sodium hydroxide solution for complete neutralization. The organic compound is
  • Question 21
    1 / -0

    Condense the following complete structural formula given below. Choose the appropriate answer given below

    Solution

    All the single bonds are broken and atoms are written together.

  • Question 22
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    The IUPAC name for

    Solution

    The given compound contains chloro group at position 1, nitro at position 2 and methyl at position 3. So 1-Chloro-4-methyl-2-nitrobenzene is the IUPAC name of the given compound with groups named in alphabetical order.

  • Question 23
    1 / -0
    What is the molecular formula of naphthalene?
  • Question 24
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    Which of the following is the correct IUPAC name?

    Solution

    While writing IUPAC name, alkyl groups are written in alphabetical order. thus lower locant 3 is assigned to ethyl. prefix di, tri or tetra are not included in alphabetical order

  • Question 25
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    Which of the following species does not have an sp2 hybridised carbon atom?
  • Question 26
    1 / -0
    Ethylene oxide, when treated with Grignard reagent, yields
  • Question 27
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    Write the state of hybridisation of carbon in H2C=O and mention the molecular geometry also.

    Solution

    Due to the presence of a double bond in the carbonyl carbon ( >C=O), carbon is sp2 hybridised. This hybridization leads to a trigonal planar geometry which means a bond angle of 120° around the C.

  • Question 28
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    The compounds C2H5OC2H5 and CH3OCH2CH2CH3 are
  • Question 29
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    Which of the following methods is used for the separation of two immiscible liquids?
  • Question 30
    1 / -0

    In general, in the molecules containing multiple bonds,_____ provide the most reactive centres. Choose the most appropriate one.

    Solution

    π bond formed by sideways overlapping of p orbitals/d orbitals on adjacent atoms provides the most reactive centers.

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