#### Hydrocarbons Model Question Paper

11th Standard

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 50
5 x 1 = 5
1. C6H5CH2CH2CH3 is when oxidised in the presence of alke . kMnO4, the product obtained is

(a)

C6H5CHO

(b)

C6H5COOH

(c)

C6H5CH2CH2CHO

(d)

C6H5COCH3

2. The number of axial hydrogen atoms in chair form of cyclohexane is

(a)

3

(b)

6

(c)

12

(d)

2

3. Torsion strain is the repulsive interaction between

(a)

Electron cloud of two bonds

(b)

Electron cloud of two $\sigma$-bonds

(c)

Electron cloud of two $\pi$-bonds

(d)

Electron cloud of two $\sigma$-bonds on adjacent atoms

4. In E1,reaction, the intermediate formed is

(a)

Carbanion

(b)

Carbocation

(c)

(d)

Carbene

5. How many structural isomers are possible for the molecular formula C4H8 which can undergo ozonolysis?

(a)

2

(b)

4

(c)

3

(d)

1

6. 5 x 2 = 10
7. Identify A and B from the following. ${ C }_{ 2 }{ H }_{ 6 }O\overset { con.{ H }_{ 2 }{ SO }_{ 4 } }{ \underset { 430-440K }{ \longrightarrow } } A\overset { { H }_{ 2 } }{ \underset { Ni,298K }{ \longrightarrow } } B$

8. What is peroxide effect? Give example.

9. Write a note or Birch reduction.

10. Convert bromo benzene to toluene and name the process.

11. How will you prepare methane from grignard reagent?

12. 5 x 3 = 15
13. Listout the uses of alkanes.

14. Explain the isomerism exhibited by alkenes.

15. Write a note on the following reactions.
(i) Dehydration of ethanol
(ii) Electrolysis of potassium succinate
(iii) Chlorination of ethene

17. Explain the molecular orbirtal structure of benzene.

18. 4 x 5 = 20
19. Explain the industrial and laboratory preparation of benzene and toluene.

20. Write only the equations representing the electrophilic substitution in benzene.

21. Explain the acidic nature of alkynes.

22. Write the mechanism of chlorination of benzene.