#### 11th Standard Chemistry Hydrocarbons English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021

11th Standard

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Chemistry

Time : 00:20:00 Hrs
Total Marks : 20

20 x 1 = 20
1. The correct statement regarding the comparison of staggered and eclipsed conformations of ethane is

(a)

the eclipsed conformation of ethane is more stable than staggered conformation even though the eclipsed conformation has torsional strain

(b)

the staggered conformation of ethane is more stable than eclipsed conformatio, because staggered conformation has no torsional strain

(c)

the staggered conformation of ethane is less stable than eclipsed conformation, because staggered conformation has torsional strain

(d)

the staggered conformation of ethane is less stable than eclipsed conformation, because staggered conformation has no torsional strain

2. In the following reaction,

The major product obtained is

(a)

(b)

(c)

(d)

3. The compounds formed at anode in the electrolysis of an aquous solution of potassium acetate are

(a)

CH4 and H2

(b)

CH4 and CO2

(c)

C2H6 and CO2

(d)

C2H4 and Cl2

4. The compound that will react most readily with gaseous bromine has the formula

(a)

C3H6

(b)

C2H2

(c)

C4H10

(d)

C2H4

5. Which among the following alkenes on reductive ozonolysis produces only propanone?

(a)

2 – Methyl propene

(b)

2 – Methyl but – 2 - ene

(c)

2, 3 – Dimethyl but – 1 – ene

(d)

2, 3 – Dimethyl but – 2 – ene

6. Major product of the below mentioned reaction is,
${ \left( { CH }_{ 3 } \right) }_{ 2 }C={ CH }_{ 2 }\overset { ICl }{ \longrightarrow }$

(a)

2–chloro –1– iodo – 2 – methyl propane

(b)

1–chloro–2–iodo–2–methylpropane

(c)

1,2 – dichloro – 2 – methyl propane

(d)

1, 2 – diiodo – 2 – methyl propane

7. Cis – 2 – butene and trans – 2 – butene are

(a)

conformational isomers

(b)

structural isomers

(c)

configurational isomers

(d)

optical isomers

8. (a)

(b)

(c)

both (a) and (b)

(d)

9. Which of the following can be used as the halide component for friedal - crafts reaction?

(a)

Chloro benzene

(b)

Bromo benzene

(c)

chloro ethene

(d)

isopropyl chloride

10. Which of the following is aliphatic saturated hydrocarbon

(a)

C8 H18

(b)

C9 H18

(c)

C8 H14

(d)

All of these

11. Peroxide effect (Kharasch effect) can be studied in case of

(a)

Oct – 4 – ene

(b)

hex – 3 – ene

(c)

pent – 1 – ene

(d)

but – 2 – ene

12. Tbe angle strain in cyclopentane is

(a)

72°

(b)

1°28'

(c)

44'

(d)

108°

13. The chair form is ______________ stabole than boat form by potential energy kJ/mol.

(a)

More, 44 kJ/mol

(b)

Less, 44 kJ/mol

(c)

More, 12.55 kJ/mol

(d)

Less, 4 kJ/mol

14. In which alkane isomerization will not occur?

(a)

C2H6

(b)

C4H10

(c)

C5H10

(d)

C6H14

15. In an attempt to prepare propane by Wurtz reaction 1 mole of methyl bromide and 1mole of ethyl bromide are treated with sodium. Assuming equal probability for all possible reaction. How many 'g' of propane will be obtained?

(a)

44 g

(b)

22 g

(c)

33 g

(d)

14.67 g

16. The number of $\pi$ and $\sigma$-bonds in toluene is respectively

(a)

3 and 6

(b)

6 and 12

(c)

3 and 10

(d)

6 and 10

17. Which of the following conformers for ethylene glycol is most stable?

(a)

(b)

(c)

(d)

18. Total number of conformations possible in cyclohexane is

(a)

Zero

(b)

Infinite

(c)

Four

(d)

Two

19. Which of the following is the most stable cycloalkane?

(a)

(b)

(c)

(d)

20. CH3 - CH = CH2 + HBr $\overset { Benzoyl\ peroxide }{ \underset { hv }{ \longrightarrow } }$Products which of the following is a possible product in the above reaction?

(a)

CH3 - CH2 - CH2 - Br

(b)

${ CH }_{ 3 }-\underset { \overset { | }{ Br } }{ CH } -{ CH }_{ 2 }-Br$

(c)

${ CH }_{ 3 }-\underset { \overset { | }{ { CH }_{ 2 } } }{ CH } -\underset { \overset { | }{ Br{ CH }_{ 2 } } Br }{ CH } -{ CH }_{ 3 }$

(d)

All of these