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Stereochemistry and aromaticity questions.

Stereochemistry and aromaticity questions.

Find Stereochemistry and aromaticity university examination questions in acaproso.com

# Question
1

In chair conformers of substituted eyelohexane large substituent groups prefer

  1. The axial position to avoid 1,3 diaxial interactions
  2. The equatorial position to avoid 1,2 diaxial interactions
  3. The axial position to avoid 1.3 diaxial interactions
  4. The equatorial position to avoid 1,3 diaxial interaction

Multiple choices
2

How many chiral centers are in the molecule with the formula CH_{3}CHFCHFCH(CH_{3})_{2}

  1. 2
  2. 3
  3. 4
  4. 8

Multiple choices
3

Cis and trans isomers of 1,2-dichloroethane have;

  1. The same boiling point
  2. Different melting point
  3. The same level of polarity
  4. Different density

Multiple choices
4

Suppose you are provided with R-thalidomine and S-thalidomine, what is streochemical relationship of the two compounds.

  1. Diastereomers
  2. Optical isomers
  3. Enantiomers
  4. Enatiomeric pure drug

Multiple choices
5

Cyclopropane when burnt in air produces more energy than propane due to;

  1. Higher molecular weight of cyclopropane
  2. Angle strain
  3. Higher intermolecular forces in cyclopropane
  4. Unreactive state of cyclopropane.

Multiple choices
6

Calculate the relative proportions of (+)-2-butanol and (-)-2-butanol required to give a specific rotation of 0.54° given that the specific rotation of pure (+)-2-butanol is 13.5°.


Mathematical Calculation
7

With examples outline the Fisher projection of conformers.


Short answers
8

Draw Newman projection for most stable conformer of each of molecule;

  1. Butane
  2. Methylcyclobutane
  3. Chlorocyclopentane
  4. Pentane

Short answers
9

Distinguish between configuration isomer and conformational isomer.


Short answers
10

Define the following terms

  1. Optical isomers
  2. Diastereomers
  3. Optical activity
  4. Steric strain

Short answers