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(a) What is the special feature of the structure of: (i) C2H2? (ii) C2H4? (b) What type of reaction is common to both of these compounds?

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Question

  1. What is the special feature of the structure of:
    1. C2H2?
    2. C2H4?
  2. What type of reaction is common to both of these compounds?
Long Answer
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Solution

    1. C2H2 contains a triple bond between the two carbon atoms (one sigma and two pi bonds) and has a linear molecular geometry (180° bond angle).
    2. C2H4 contains a double bond between the two carbon atoms (one sigma and one pi bond) and has a coplanar, trigonal planar geometry (≈ 120° bond angle).
  1. Both compounds commonly undergo addition reactions (such as hydrogenation or halogenation) because they are unsaturated hydrocarbons containing multiple carbon-carbon bonds that can easily open up to bond with new atoms.
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Chapter 17: Carboxylic Acids - Questions from ICSE Examinations [Page 292]

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Frank Chemistry Part 2 [English] Class 10 ICSE
Chapter 17 Carboxylic Acids
Questions from ICSE Examinations | Q 1999. 2. | Page 292
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