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

1.
Differentiate between the principle of estimation of nitrogen in an organic compound by (i) Dumas method and (ii) Kjeldahl’s method.
2.
Indicate the $\sigma$ and $\pi$ bonds in the following molecules : $C_6H_6$, $C_6H_{12}$, $CH_2Cl_2$, $CH_2=C=CH_2$, $CH_3NO_2$, $HCONHCH_3$
3.
Discuss the principle of estimation of halogens, sulphur and phosphorus present in an organic compound.
4.

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) 

5.
Give the IUPAC names of the following compounds : (f) $Cl_2CHCH_2OH$
6.

Identify the functional groups in the following compounds

(b) 

7.
Draw the resonance structures for the following compounds. Show the electron shift using curved-arrow notation. (b) $C_6H_5NO_2$
8.
Identify the reagents shown in bold in the following equations as nucleophiles or electrophiles: (a) $CH_3COOH + HO^– \rightarrow CH_3COO^–+H_2O$
9.
In the Lassaigne’s test for nitrogen in an organic compound, the Prussian blue colour is obtained due to the formation of:
a. (a) $Na_4[Fe(CN)_6]$ b. (b) $Fe_4[Fe(CN)_6]_3$ c. (c) $Fe_2[Fe(CN)_6]$ d. (d) $Fe_3[Fe(CN)_6]_4$
10.
Explain the principle of paper chromatography.
11.

Carbonyl compounds especially ketone undergo reduction to form

a.

Primary alcohol

 b.

Secondary alcohol

 c.

Alkane

 d.

Alkene
12.

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.

(d) 

13.
Give condensed and bond line structural formulas and identify the functional group(s) present, if any, for : (c) Hexanedial
14.
Why is a solution of potassium hydroxide used to absorb carbon dioxide evolved during the estimation of carbon present in an organic compound?
15.

Sndndhduudhdnndj

a.

Kndh

 b.

Jsshs

 c.

Nzxnd

 d.

Nznzn
16.

https://youtu.be/DLwSR3Xoj9Q

17.

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

18.

Identify the functional groups in the following compounds

(a)   

19.
Why is it necessary to use acetic acid and not sulphuric acid for acidification of sodium extract for testing sulphur by lead acetate test?
20.
Draw the resonance structures for the following compounds. Show the electron shift using curved-arrow notation. (a) $C_6H_5OH$

Worksheet Answers

9.
11.
Option B
15.
Option B
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