Chemistry : Organic Chemistry – Some Basic Principles and Techniques

In chromatography, which of the following statements is INCORRECT for R_f ?

• R_f value depends on the type of chromatography

• R_f value is dependent on the mobile phase.

• Higher R_f value means higher adsoption

• The value of R_f can not be more than more.

Number of stereo centers present in linear and cyclic structures of glucose are respectively

• 5 & 5

• 4 & 4

• 5 & 4

• 4 & 5

The increasing order of nucleophilicity of the following nucleophiles is :

(a) CH₃CO₂^Θ  (b) H₂O  (c) CH₃SO₃^Θ  (d) ^ΘOH

• b < c < a < d

• a < d < c < b

• d < a < c < b

• b < c < d < a

Structure of the compound whose IUPAC name is 3-ethyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid is

The order of stability of the following tautomeric compound is 

• I>Ii>III

• III > II>I

• Ii> I> III

• Ii> I> III

The radical  because it has

• 6 p -orbitals and 6 unpaired electrons

• 7 p- orbitals and 6 unpaired electrons

• 7 p- orbitals and 7 unpaired electrons

• 7 p- orbitals and 7 unpaired electrons

The structure of isobutyl group in an organic compound is

Which of the statements is not true?

• On passing H₂S through acidified K₂Cr₂O₇ solution, milky colour is observed.

• Na₂Cr₂O₇ is preferred over K₂Cr₂O₇ in volumetric analysis

• Na₂Cr₂O₇ solution in acidic medium is orange

• K₂Cr₂O₇ solution becomes yellow on increasing the pH beyond 7

Which nomenclature is not according to IUPAC system?

Sulphur trioxide can be obtained by which of the following reaction