Organic chemistry questions

Fundamental principles of organic chemistry

Study organic chemistry not consider the chemistry of natural products. This page provides the application of fundamental principles of natural products and the study of compounds of natural products.
Problems on organic chemistry appear really as problems for most of the students studying chemistry 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.

Organic chemistry nomenclature

Problem
Write down the common names of the following organic compounds
  1. CH₂CH₂CH₂CH=CH₂
  2. CH₃CH=CHCH₂CH₃.
Answer
These two hydrocarbons are alkenes contain one double bond with general molecular formula CnH₂n. Above two compounds has five carbon atom with a double bond in two different  carbon atom and name of the compound
CH₂CH₂CH₂CH=CH₂
1-pentylene or α-pentylene.

CH₃CH=CHCH₂CH₃
2-pentylene or β-pentylene.

Problem
What are the names of the following organic 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
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Fundamental principles and questions answer to organic chemistry for students studying in different Schools, Colleges, and Universities.

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