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CBSE - Class 11 Chemistry Organic Chemistry – Some Basic Principles and Techniques Worksheet

1.
What are electrophiles and nucleophiles ? Explain with examples.
2.

Which is the fundamental particle of an atom?

A)

Electron

 B)

Neutron

 C)

Proton

 D)

All of these
3.

The best and latest technique for isolation, purification and separation of organic compounds is:

A)

Crystallisation

 B)

Distillation

 C)

Sublimation

 D)

Chromatography
4.

Identify the smallest alkane which can form a ring structure (cycloalkane)

A)

Cyclomethane

 B)

Methane

 C)

Cyclopropane

 D)

Propane
5.

For the following bond cleavages, use curved-arrows to show the electron flow and classify each as homolysis or heterolysis. Identify reactive intermediate produced as free radical, carbocation and carbanion.

(a) 

6.
Explain the reason for the fusion of an organic compound with metallic sodium for testing nitrogen, sulphur and halogens.
7.
Which of the following represents the correct IUPAC name for the compounds concerned ? (d) But-3-yn-1-ol or But-4-ol-1-yne.
8.
Draw the resonance structures for the following compounds. Show the electron shift using curved-arrow notation. (f) $CH_3CH=CHC^+H_2$
9.
Give condensed and bond line structural formulas and identify the functional group(s) present, if any, for : (b) 2-Hydroxy-1,2,3-propanetricarboxylic acid
10.

Which of the following carbocation is most stable ?

A)

$(CH_3)_3C. C^+H_2$

 B)

$(CH_3)_3C^+$

 C)

$CH_3CH_2C^+H_2$

 D)

$CH_3C^+H CH_2CH_3$
11.

For the following bond cleavages, use curved-arrows to show the electron flow and classify each as homolysis or heterolysis. Identify reactive intermediate produced as free radical, carbocation and carbanion.

(b) 

12.
Explain why alkyl groups act as electron donors when attached to a $\pi$ system.
13.
Give a brief description of the principles of the following techniques taking an example in each case. (b) Distillation
14.
Which of the following represents the correct IUPAC name for the compounds concerned ? (c) 2-Chloro-4-methylpentane or 4-Chloro-2-methylpentane
15.
In the estimation of sulphur by Carius method, 0.468 g of an organic sulphur compound afforded 0.668 g of barium sulphate. Find out the percentage of sulphur in the given compound.
16.
Give a brief description of the principles of the following techniques taking an example in each case. (c) Chromatography
17.
Draw the resonance structures for the following compounds. Show the electron shift using curved-arrow notation. (b) $C_6H_5NO_2$
18.
Describe the method, which can be used to separate two compounds with different solubilities in a solvent S.
19.

Give the IUPAC names of the following compounds : (e) 

20.
0.3780 g of an organic chloro compound gave 0.5740 g of silver chloride in Carius estimation. Calculate the percentage of chlorine present in the compound.

CBSE - Class 11 Chemistry Organic Chemistry – Some Basic Principles and Techniques Worksheet

Answers

2.
Option D
3.
4.
Option C
10.
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