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Isomerism Test - 7

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Isomerism Test - 7
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Weekly Quiz Competition
  • Question 1
    1 / -0

    Write the state of hybridisation of carbon in H2C=O.

    Solution

    C in H2C=O is sp2 hybridised and geometry is planar.

  • Question 2
    1 / -0

    What is the correct order of decreasing stability of the following cations.

    Solution

     

    Stability of carbocation increases with the dispersal of positive charge by the donation of eletron density through   effect The groups showing effect are  thus the correct stability order of the given carbocations is 

  • Question 3
    1 / -0

    C4H10O represents methoxypropane (CH3OC3H7) and ethoxyethane (C2H5O C2H5)

    Solution

    rearrangement of carbon atoms around the functional group is known as metamerism.

  • Question 4
    1 / -0

    Electrophilic addition reactions proceed in two steps. The first step involves the addition of an electrophile. Name the type of intermediate formed in the first step of the following addition reaction. 

    H3C−−−HC = CH2+ H+→?

    Solution

    A secondary carbocation is formed.

  • Question 5
    1 / -0

     

    During estimation of nitrogen present in an organic compound by Kjeldahl’s method, the ammonia evolved from 0.5 g of the compound, neutralized 10 mL of 1 M H2SO4.Find out the percentage of nitrogen in the compound.

     

    Solution

     

     

    moles of NH3= moles of N= 2 × 10 ×1/1000 = 0.02 moles Mass of N = 0.02 × 14 % = 0.02 x 14 × 100/0.5 = 56%

     

     

  • Question 6
    1 / -0

    The IUPAC name for

    Solution

    1-Chloro-4-methyl-2-nitrobenzene is the iupac name of the given compound.

  • Question 7
    1 / -0

     

    What is the type of hybridisation of each carbon in the compound (CH3)2CO?

     

    Solution

     

     

    C in CH3 is sp3 and C of C=O bond is sp2.

     

     

  • Question 8
    1 / -0

    The organic compound given below is one of the four options given below. Choose the most appropriate one. 

    Solution

    this is aliphatic heterocyclic compound.

  • Question 9
    1 / -0

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

    Solution

    pie bonds are the most reactive centers.

  • Question 10
    1 / -0

     

    Which of the following is the correct IUPAC name?

     

    Solution

    While writing IUPAC name, the alkyl groups are written in alphabetical order. Thus lower locant 3 is assigned to ethyl. Prefix, di, tri, and tetra are not included in alphabetical order. 

     

  • Question 11
    1 / -0

    In a π (pi) bond formation, is necessary for one of the below criteria. Choose the appropriate one.

    Solution

    parallel orientataion of p orbitals are necessary for proper overlapping and formation of pie bond.

  • Question 12
    1 / -0

    Alkyl radical (Methyl, Ethyl, Isopropyl, Tert-butyl free radical) stability in the increasing order is:

    Solution

    tertiary radical is more than secondary and primary.

  • Question 13
    1 / -0

    The order of decreasing priority for some functional groups in the naming of an organic compound is:

    Solution

    COOR (R=alkyl group), -COCl, -CONH2, -CN,-HC=O, >C=O, -OH, −NH2 is the decreasing order of priority

  • Question 14
    1 / -0

    Covalent bond can undergo fission in two different ways. The correct representation involving a heterolytic fission of CH3−−−Br is

    Solution

    arrows are shown in the direction of movement of electrons.

  • Question 15
    1 / -0

    When inductive and electromeric effects operate in opposite directions, what happens?

    Solution

    When inductive and electromeric effects operate in opposite directions then electomeric effect predominates

  • Question 16
    1 / -0

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

    Solution

    pie bonds are the most reactive centers.

  • Question 17
    1 / -0

    The nitrogen containing organic compound, when heated with copper oxide in an atmosphere of carbon dioxide, yields:

    Solution

    The nitrogen containing organic compound, when heated with copper oxide in an atmosphere of carbon dioxide, yields free nitrogen

  • Question 18
    1 / -0

    Which of the following statement is not correct for a nucleophile? 

    Solution

    Nucleophile is not Lewis acid. Lewis acids are those substances which accept lone pairs. However, nucleophiles itself are lone pair donors.

  • Question 19
    1 / -0

    The addition of HCl to an alkene proceeds in two steps. The first step is the attack of H+ ion to portion which can be shown as

    Solution

    It is the correct representation since double bond has

    high electron density, it provides electron pair for attack on H+. A carbocation results.

  • Question 20
    1 / -0

    What does the following diagram showing Lewis structures depict?

    Solution

    they are resonating structures of nitromethane

  • Question 21
    1 / -0

    Which of the following compounds contain all the carbon atoms in the same hybridisation state?

    Solution

    In A all Carbon atoms are sp hybridized

  • Question 22
    1 / -0

    A known mass of an organic compound is heated with fuming nitric acid in the presence of silver nitrate is:

    Solution

    This is known as carius method.

  • Question 23
    1 / -0

    For testing halogens in an organic compound with AgNO3 solution, sodium extract (Lassaigne’s test) is acidified with dilute HNO3.What will happen if a student acidifies the extract with dilute H2SO4 in place of dilute HNO3?

    Solution

    white precipitate of Ag2SO4 is formed.

  • Question 24
    1 / -0

    Nucleophile is a species that should have:

    Solution

    nucleophile should have negative charge or pair of electron to donate.

  • Question 25
    1 / -0

    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

    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 known as Hyperconjugation

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