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

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

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1.

The reaction: $CH_3CH_2I + KOH(aq) \rightarrow CH_3CH_2OH + KI$ is classified as :

1.

electrophilic substitution

 2.

nucleophilic substitution

 3.

elimination

 4.

addition
2.
In the organic compound $CH_2 = CH – CH_2 – CH_2 – C \equiv CH$, the pair of hydridised orbitals involved in the formation of: $C_2 – C_3$ bond is:
1. (a) $sp – sp^2$ 2. (b) $sp – sp^3$ 3. (c) $sp^2 – sp^3$ 4. (d) $sp^3 – sp^3$
3.
In the Lassaigne’s test for nitrogen in an organic compound, the Prussian blue colour is obtained due to the formation of:
1. (a) $Na_4[Fe(CN)_6]$ 2. (b) $Fe_4[Fe(CN)_6]_3$ 3. (c) $Fe_2[Fe(CN)_6]$ 4. (d) $Fe_3[Fe(CN)_6]_4$
4.

Which of the following carbocation is most stable ?

1.

$(CH_3)_3C. C^+H_2$

 2.

$(CH_3)_3C^+$

 3.

$CH_3CH_2C^+H_2$

 4.

$CH_3C^+H CH_2CH_3$
5.

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

1.

Crystallisation

 2.

Distillation

 3.

Sublimation

 4.

Chromatography
6.
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.
7.
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.
8.
Why is it necessary to use acetic acid and not sulphuric acid for acidification of sodium extract for testing sulphur by lead acetate test?
9.
An organic compound contains 69% carbon and 4.8% hydrogen, the remainder being oxygen. Calculate the masses of carbon dioxide and water produced when 0.20 g of this substance is subjected to complete combustion.
10.
A sample of 0.50 g of an organic compound was treated according to Kjeldahl’s method. The ammonia evolved was absorbed in 50 ml of 0.5 M $H_2SO_4$. The residual acid required 60 mL of 0.5 M solution of NaOH for neutralisation. Find the percentage composition of nitrogen in the compound.
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Chapters in CBSE - Class 11 Chemistry

Some Basic Concepts of Chemistry Worksheet Structure of Atom Worksheet Classification of Elements and Periodicity in Properties Worksheet Chemical Bonding and Molecular Structure Worksheet Thermodynamics Worksheet Equilibrium Worksheet Redox Reactions Worksheet Hydrocarbons Worksheet

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