Basic Concept of Organic Reactions Three Marks Questions

11th Standard

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Chemistry

Time : 00:45:00 Hrs
Total Marks : 30
    10 x 3 = 30
  1. While writing the resonance structures, what are the rules to be followed?

  2. Distinguish between electrophiles and nucleophiles

  3. What are the possible types of electron movement? Represent them by clearly indicating the electron shift.

  4. Discuss the reason behind the classification of inductive effect into +I and -I effect.

  5. Explain the substitution reaction in detail with suitable examples.

  6. Carry over the following reaction mechanisms.
    (i) Bromination of alkene
    (ii) Addition of HCN to CH3CHO
    (iii) Formation of alkyl bromide with benzoyl peroxide as radical initiator.

  7. Which of the following compounds will not exist as resonance hybrid? Give reason for your answer.
    (i) CH3 - OH
    (ii) R-CONH2
    (iii) CH3-CH = CH-CH2NH2

  8. Which bond is more polar in the following pair of molecular?
    (i) H3C-H (or) H3C-Br
    (ii) H3C-NH2 (or) H3C-OH
    (iii) H3C-OH (or) H3C-SH

  9. Write structures of various carbocations that can be obtained from 2-methyl butane. Arrange these carbocations in order of increasing stability.

  10. The structure of triphenylmethyl cation is given below. This very stable and some of its salts can be stored for months. Explain the cause of high stability of this cation.

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