Chemistry : Organic Chemistry – Some Basic Principles and Techniques

Which of the following is the most reactlve towards ring nitration ?

• benzene

• toulene

• m-xylene

• mesitylene

Racemic compound has

• equimolar mixture of enantiomers

• 1 : 1 mixture of enantiomer and diastereomer

• 1 : 1 mixture of diastereomers

• 1 : 2 mixture of enantiomers

In which of the following ways does the hydride ion tend to function ?

• An electrophile

• A nucleophile

• A free radical

• An acid

The following compound differ in

• configuration

• conformation

• structure

• chirality

The shape of electrophile which attacks on benzene nucleus in the Friedel-Craft's alkylation (methylation) reaction is

• linear

• planar

• pyramidal

• tetrahedral

The total number of isomers formed by C₅H₁₀ is

• 2

• 3

• 4

• 5

Consider the following carbocations-

I. (CH₃)₂CH⁺

II. CH₃CH${}_2^{+}$

III. C₆H₅CH${}_2^{+}$

IV. (CH₃)₃C⁺

The correct sequence for the stability of these is

• II < I < III < IV

• II < III < I < IV

• III < I < II < IV

• IV < III < I < II

Which order is correct regarding the -I effect of the substituents ?

• -NR₂ < -OR < -F

• -NR₂ > -OR < -F

• -NR₂ < -F < -OR

• -NR₂ > -OR > -F

Which of the following is not a nucleophile ?

• Water

• Sulphur trioxide

• Ammonia

• Ether

Friedel-Craft's acylation reaction involves

• nucleophilic substitution

• electrophlic substitution

• electrophilic addition

• nucleophilic addition