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Mechanism Test - 2
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Mechanism Test - 2

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  • Question 1/10
    1 / -0

    Point out the incorrect statement about resonance?

    Solutions

    The resonating structures should have same number of electron pairs.

  • Question 2/10
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    Which of the following ions is the most resonance stabilised?

    Solutions

    Phenoxide ion shows maximum resonating structures.

  • Question 3/10
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    Hyperconjugation is

    Solutions

    Hyperconjugation involves conjugation of a electrons of C - H bond and π electrons of multiple bond.
    It is noticed due to delocalisation of σ- and π-bonds. It is . also known as no bond resonance.

  • Question 4/10
    1 / -0

    The number of hyperconjugating structures shown by the carbocations are given below. Which one is not correctly matched?

    Solutions

    shows 6 hyperconjuigatihg structures

  • Question 5/10
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    In which of the following species hyperconjugation is possible?

    Solutions

    For hyperconjugation α-carbon with respect to sp2 hybridised carbon should have at least one hydrogen.

  • Question 6/10
    1 / -0

    Answer the following question based on the given paragraph.
    Stability of carbocation, alkylfree radical and alkene can be explained on the basis of hyperconjugation.
    In all these cases, there is presence ofhydrogen atom at theadjacent carbon atom ofsp2 hybridised carbon atom. Total number of hyperconjugating structures depends upon the number of hydrogen atoms present at adjacent carbon atom of sp2 C-atom.
    More the hyperconjugating structures, more is the stabihty of the ion.

    Decreasingorder of stabilityof following alkenes is
    (i) CH3 - CH = CH2
    (ii) CH3 - CH = CH - CH3
    (iii) 
    (iv) 

    Solutions

  • Question 7/10
    1 / -0

    Which of the following alcohols on dehydration gives most stable carbocation? 

    Solutions


    Tertiary carbocation is more stable than secondary and primary carbocatioris.

  • Question 8/10
    1 / -0

    Which of the following contains three pairs of electrons in valence shell?

    Solutions

    In carbocations, the carbon atom with positive charge has only 6 electrons in its valence shell.

  • Question 9/10
    1 / -0

    Stability of alkyl carbocations can be explained by

    Solutions

    Stability of alkyl carbocations can be explained by both inductive effect and hyperconjugation.

  • Question 10/10
    1 / -0

    In the given reaction two products are expected.

    The product (B) is formed as a major product because

    Solutions



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