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Chemistry Test - 23

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Chemistry Test - 23
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Weekly Quiz Competition
  • Question 1
    1 / -0

    The number of water molecules formed by the combustion of one mole of alkane containing m carbon atoms is:

    Solution
    The general formula of alkane is \(C_{m} H_{2 m} .\) The combustion reaction is as follows:
    \(C_{m} H_{(2 m+2)}+\frac{3 m+1}{2} O_{2} \rightarrow m C O_{2}+(m+1) H_{2} O\)
    \((m+1)\) water molecules are formed in the combustion of one mole of alkane containing \(m\) carbon atoms.
    Hence, the correct option is (C)
  • Question 2
    1 / -0

    Chloro atom in chlorobenzene is ortho and para director because:

    Solution
    \(C l^{-}\) has two effects \(-I\) and \(+M .\) Due to \(-I\) effect of \(C l^{-}\) group, it reduces electron density of benzene. So, chlorobenzene is less reactive than benzene for electrophilic substitution reaction. But due to \(+M\) effect, it is ortho and para directing (resonance effect predominates over inductive effect) and in chlorobenzene further substitution takes place at ortho and para positions.
    Hence, the correct option is (A)
  • Question 3
    1 / -0

    Heating of sodium acetate with sodalime (mixture of NaOH + CaO) is called :

    Solution

    Decarboxylation is a chemical reaction that removes a carboxyl group and releases carbon dioxide (CO2). Usually, decarboxylation refers to a reaction of carboxylic acids, removing a carbon atom from a carbon chain.

    The given reaction involves removal of carbon dioxide molecule, therefore, it is a decarboxylation reaction.
    Hence, the correct option is (B)

  • Question 4
    1 / -0

    Both methane and ethane may be obtained by suitable one step reaction from :

    Solution
    \(C H_{3} I+H_{2} \rightarrow C H_{4}+H I\)
    Catalytic reduction of methyl iodide produces methane
    \(C H_{3} I+N a+I C H_{3} \stackrel{D r y e t h e r}{\longrightarrow} C H_{3} C H_{3}+2 N a I\)
    Methyl iodide on Wurtz reaction produces ethane
    Hence, the correct option is (B)
  • Question 5
    1 / -0

    The solvent used in Wurtz reaction is:

    Solution

    The Wurtz reaction, named after Charles-Adolphe Wurtz, is a coupling reaction in organic chemistry, organometallic chemistry and recently inorganic main group polymers, whereby two alkyl halides are reacted with sodium to form a new alkane. Dry ether is the solvent used in Wurtz reaction.
    Hence, the correct option is (D)

  • Question 6
    1 / -0

    Among the following gases, heat of combustion is highest for:

    Solution

    Among alkanes, alkynes and alkenes having some no. of carbon atoms, alkane has maximum heat of combustion due to more no. of hydrogen atoms. Down the homologous series, heat of combustion increases due to more no. of carbon atoms.
    Hence, the correct option is (B)

  • Question 7
    1 / -0

    The four sp3 hybrid orbitals of carbons in alkanes are directed towards the corner of a:

    Solution

    The four sp3 hybrid orbitals of carbons in alkanes are directed towards the corner of a regular tetrahedron. The shape of the molecule is tetrahedral. Edges of a regular tetrahedron are separated by an angle of 109028′ and so are sp3orbitals.
    Hence, the correct option is (A)

  • Question 8
    1 / -0

    In which of the following reactions a new C-C bond is formed in the prepration of ethane ?

    Solution

    2CH3COO−Na++2H2O→CH3CH3+2CO2+H2+2NaOH
    Hence, the correct option is (D)

  • Question 9
    1 / -0

    Ethane cannot be obtained by which of the following method?

    Solution

    Hydrolysis of Al4C3 forms methane

    Al4C3+12H2O→3CH4+4Al(OH)3
    Hence, the correct option is (D)

  • Question 10
    1 / -0

    Calcium heptane dioate on distillation produces :

    Solution

    Calcium salts of saturated dicarboxylic acids on heating give corresponding cyclic ketones. The Clemmenson reduction of cyclic ketones results in the formation of corresponding cycloalkanes. The reaction is best used for the synthesis of cyclopentane, cyclohexane, and cycloheptane.



    Hence, the correct option is (C)

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