#### Fundamentals of Organic Chemistry Model Question Paper

11th Standard

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 50
5 x 1 = 5
1. The compound which has one isopropyl group is

(a)

2,2,3,3 - Tetramethyl pentane

(b)

2,2 - Dimethyl pentane

(c)

2,2,3 - Trimethyl pentane

(d)

2 - Methylpentane

2. The number of chain isomers possible in C5 HI2 is

(a)

2

(b)

3

(c)

4

(d)

5

3. Number of structural isomers possible in C3H6O are

(a)

9

(b)

6

(c)

5

(d)

3

4. Principle behind crystallization is

(a)

solubility difference

(b)

boiling point difference

(c)

refractive index difference

(d)

difference in vapour pressure

5. What is the method involved in purification of chloroform and aniline?

(a)

Sublimation

(b)

Crystallization

(c)

Distillation

(d)

Chromatography

6. 5 x 2 = 10
7. How many sigma and pi bonds are present in
(i) ${ CH }_{ 3 }-C\equiv N$
(ii) ${ CH }_{ 3 }=C=N?$

8. Structures and IUPAC names of some hydrocarbons are given below. Explain why ,the names given in the parentheses .are incorrect.
(i)

$CH_{ 3 }-\underset { \underset { OH }{ | } }{ CH } -{ CH }_{ 2 }-{ CH }_{ 2 }-\underset { \underset { { CH }_{ 3 } }{ | } }{ CH } -\underset { \underset { { CH }_{ 3 } }{ | } }{ CH } -{ CH }_{ 2 }-{ CH }_{ 3 }$

2,5,6 - trimethyl octane and not
3,4,7 - trim ethyl octane
(ii) $CH_{ 3 }-{ CH }_{ 2 }-\underset { \underset { { C_{ 2 }H }_{ 3 } }{ | } }{ CH } -{ CH }_{ 2 }-\underset { \underset { { CH }_{ 3 } }{ | } }{ CH } -{ CH }_{ 2 }-{ CH }_{ 3 }$
3-ethyl-5-methylheptane and not
5-ethyl-3-methylheptane

9. Write note on the stability of cis and trans isomers.

10. Define optical isomerism.

11. Derive the structure of (i) Pent-s-en-z-ol (ii) Cyclohex-2-en-I-01

12. 5 x 3 = 15
13. Write a brief note on sublimation.

14. Suggest and explain the method suitable to purify the organic compounds depending on their boiling points.

15. Which among the following hybrid orbitals are highly electronegative? sp, sp2 , sp3 .

16. Write about the main responsibility of the functional group in an organic compound.

17. Draw the structure (i) l-(cyclo bytyl)-2 (cylopropyl) ethane
(ii) 2-carbamyl cyclobutane-I-carboxylic acid

18. 4 x 5 = 20
19. Describe tautomerism with relevant examples.

20. Explain the estimation of carbon and hydrogen present in an organic compound.

21. Discuss the principle and procedure involved in estimating the amount of sulphur present in an organic compound.

22. 0.50 g of an organic compound was Kjeldahlished. The ammonia evolved was passed in 50 cmof IN H2S04, The residual acid required 60 cm3 of N/2 NaOH solution. Calculate the percentage of nitrogen in the compound.