#### Fundamentals of Organic Chemistry Three Marks Questions

11th Standard

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Chemistry

Time : 00:45:00 Hrs
Total Marks : 30
10 x 3 = 30
1. Write structural formula for the following compounds
(i) Cyclohexa-1, 4-diene
(ii) Ethynyl cyclohexane.

2. Write structural formula for the following compounds
(i) m - dinitrobenzene
(ii) p-dichloro benzene
(iii)1, 3, 5- Trimethyl benzene.

3. Write all the possible isomers of molecular formula C4H10O and identify the isomerisms found in them.

4. In an estimation of sulphur by carius method, 0.2175 g of the substance gave 0.5825 g of BaSO4 calculate the percentage composition of S in the compound.

5. 0.16 g of an organic compound was heated in a carius tube and H2SO4 acid formed was precipitated with BaCl2. The mass of BaSO4 was 0.35g. Find the percentage of sulphur [30.04]

6. 0.284 g of an organic substance gave 0.287 g AgCl in a carius method for the estimation of halogen. Find the Percentage of Cl in the compound.

7. 0.40 g of an iodo-substituted organic compound gave 0.235 g of AgI by carius method. Calculate the percentage of iodine in the compound. (Ag = 108, I = 127) (Ans = 31.75)

8. 0.24 g of organic compound containing phosphorous gave 0.66 g of Mg2P2O7 by the usual analysis. Calculate the percentage of phosphorous in the compound.

9. 0.33 g of an organic compound containing phosphorous gave 0.397 g of Mg2P2O7 by the analysis. Calculate the percentage of P in the compound.

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