Organic Chemistry – Some Basic Principles and Techniques

Which ofthe following complexes exists as pair of enantiomers ?

• trans-[Co(en)₂Cl₂]⁺

• [Co(NH₃)₂Cl₂]⁺

• [Co{P(C₂H₅)₃}₂ClBr]

• [Cr(en)₃]³⁺

Which of the following compounds is aromatic in nature?

Which of the following is an electrophile?

• CCl₂

• CH${}_3^{-}$

• H₂O

• NH₃

What is the correct order of basicity among the following compounds ?

• II > I > III > IV

• I > II > III > IV

• III > I > II > IV

• I > III > II > IV

Arrange the following nucleophiles in the decreasing order of nucleophilicity :

(A) CH₃COO^-

(B) CH₃O^-

(C) CN^-

(D) 

• C, B, A, D

• A, B, C, D

• C, C, B, A

• B, C, A, D

Which one of the following is the most stable reactive intermediate?

Assertion : Thiophene present in commercial benzene as an impurity can be removed by shaking the mixture with cold concentrated H₂SO₄.

Reason : Thiophene is a heterocyclic aromatic compound.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false.

Ease of nucleophilic addition in the given compounds is

• I > III > II

• II > III > I

• II > I > III

• III > I > II

Which of the following species is not aromatic?

• Benzene

• Cyclooctatetraenyl dianion

• Tropylium ion

• Cyclopentadienyl cation

Select the correct statement.

• Geometrical isomer may differ in dipole moment and visible/UV spectra.

• Complexes of the type [Ma₃b₃] can also have facial (fac) and meridional (mer) isomer.

• No optical isomer exists for the complex trans- [Co(en)₂Cl₂]⁺.

• All of these.