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

1.
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.
2.

What is the relationship between the members of following pairs of structures ? Are they structural or geometrical isomers or resonance contributors ?

(a) 

3.
Draw the resonance structures for the following compounds. Show the electron shift using curved-arrow notation. (a) $C_6H_5OH$
4.
Explain the principle of paper chromatography.
5.
Describe the method, which can be used to separate two compounds with different solubilities in a solvent S.
6.
Draw formulas for the first five members of each homologous series beginning with the following compounds. (c) H–CH=CH2
7.
Identify the reagents shown in bold in the following equations as nucleophiles or electrophiles: (b) $CH_3COCH_3+ C^–N \rightarrow (CH_3)_2C(CN)(OH)$
8.
Indicate the $\sigma$ and $\pi$ bonds in the following molecules : $C_6H_6$, $C_6H_{12}$, $CH_2Cl_2$, $CH_2=C=CH_2$, $CH_3NO_2$, $HCONHCH_3$
9.
Draw the resonance structures for the following compounds. Show the electron shift using curved-arrow notation. (b) $C_6H_5NO_2$
10.

Carbonyl compounds especially ketone undergo reduction to form

a.

Primary alcohol

 b.

Secondary alcohol

 c.

Alkane

 d.

Alkene
11.

Which of the following in eliminations reaction

a.

Chlorination of ethane

 b.

Hydration of ethene

 c.

Conversion of but- 1-ene into but-2-ene

 d.

Dehydration of ethanol
12.
Discuss the principle of estimation of halogens, sulphur and phosphorus present in an organic compound.
13.
What is the difference between distillation, distillation under reduced pressure and steam distillation ?
14.
Write bond line formulas for : Isopropyl alcohol, 2,3-Dimethylbutanal, Heptan-4-one.
15.
Draw formulas for the first five members of each homologous series beginning with the following compounds. (b) $CH_3COCH_3$
16.
Draw the resonance structures for the following compounds. Show the electron shift using curved-arrow notation. (c) $CH_3CH=CHCHO$
17.
Give condensed and bond line structural formulas and identify the functional group(s) present, if any, for : (c) Hexanedial
18.

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.

$CH_3C^+H CH_2CH_3$
19.
Draw the resonance structures for the following compounds. Show the electron shift using curved-arrow notation. (e) $C_6H_5–C^+H_2$
20.

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) 

Worksheet Answers

10.
Option B
11.
Option D
18.
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