Organic chemistry questions answers

    Problems on organic chemistry appear really as problems for most of the students studying in different Schools, Colleges and different Universities.
    To overcome these problems to achieve a good performance in examinations I will discuss some of these problems topic wise. Priyam study centre updated this page regularly so keep in touch with this page.
Problem
    Write down the common names of the following alkenes
  1. CH₂CH₂CH₂CH=CH₂
  2. CH₃CH=CHCH₂CH₃
Answer

CH₂CH₂CH₂CH=CH₂
Parent alkane is pentane
Thus the name of the compound is
1-pentylene or α-pentylene

CH₃CH=CHCH₂CH₃Parent alkane is pentane
Thus the name of the compound is
2-pentylene or β-pentylene

Problem
    What are the names of the following compounds in the IUPAC system?
  1. CH₃ - CH₂ - CH = CH₂
  2. C(CH₃)₂ = CH₂
  3. CH₃ - CH = C(CH₃) - CH₂ - CH₃
  4. CH₂ = C(C₂H₅) - CH(CH₃)₂


Answer

CH₃ - CH₂ - CH = CH₂
but-1-ene

CH₃C(CH₃) = CH₂
2-methylprop-1-ene

CH₃ - CH = C(CH₃) - CH₂ - CH₃
3-methylpent-2-ene

CH₂ = C(C₂H₅) - CH(CH₃)₂
2-ethyl-3-methylbut-1-ene
Problem

Arrange the following Alkenes in order of increasing stability and give your reasons.

  1. Me₂C=CH₂
  2. cis-MeCH=CHMe
  3. trans-MeCH=CHMe
  4. MeCH₂CH=CH₂
Answer
    MeCH₂CH=CH₂(but-1-ene)ㄑcis-MeCH=CHMe(cis but-2-ene)ㄑtrans-MeCH=CHMe(trans but-2-ene) ㄑMe₂C=CH₂(isobutene)
Problem
    Which of the following carbocation is more stable?
  1. CH₃CH₂⁺
  2. CH₃(CH₃)CH⁺
  3. CH₃(CH₃)C⁺CH₃.
Answer
    The explanation for the order of the stability of these carbocations by hyperconjugation. The number of hydrogen atoms available for hyperconjugation is 3 for (i), 6 for (ii) and 9 for (ii). Consequently, (iii) would be expected to be the most stable.
Thus the stability order is (iii) 〉(ii) 〉(i)
Problem
    How to convert
  1. MeCH₂CH₂OH → MeCH(OH)Me
  2. Me₂CHCH₂OH → Me₃COH
Answer
Questions and answers of organic chemistry and alcohol
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Organic chemistry questions answer for the for high school and college courses with explanation

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