Hydrocarbons

Hydrocarbons
Class:XI / Unit:13

1. A dibromo derivative of an alkane reacts with sodium metal to form an alicyclic hydrocarbon. The derivative is

1, 2-dibromoethane
2, 2-dibromobutane
1, 4-dibromobutane
1, 1-dibromopropane

2. The position of double bond in alkenes can be located by :

Hydrogenation of oil
Hydration
Photolysis
Ozonolysis

3. Nitrobenzene on reaction with conc. HNO₃/H₂SO₄ at 80 – 100°C forms which one of the following products?

1, 3-Dinitrobenzene
1, 2-Dinitrobenzene
1, 4-Dinitrobenzene
1, 2, 4-Trinitrobenzene

4. Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating?

-SO₃H
-COOH
–C ≡ N
-NO₂

5. The order of decreasing reactivity towards an electrophilic reagent, for the following : (i) Benzene (ii) Toluene (iii) Chlorobenzene (iv) Phenol would be:

(i) > (ii) > (iii) > (iv)
(ii) > (iv) > (i) > (iii)
(iv) > (ii) > (i) > (iii)
(iv) > (iii) > (ii) > (i)

6. Pure methane can be prepared by

Reduction with H₂
Wurtz reaction
Soda lime decarboxylation
Kolbes electrolytic method

7. The compound C₃H₄ has a triple bond, which is indicated by its reaction with

Fehling solution
Bayers reagent
Ammonical silver nitrate
Bromine water

8. Isopropyl bromide on Wurtz reaction gives

Hexane
Propane
2, 3 – Dimethylbutane
Neohexane

9. The first fraction obtained during the fractionation of petroleum is:

Gasoline
Diesel Oil
Hydrocarbon Gases
Kerosene Oil

10. Which one of these is not true for benzene?

Heat of hydrogenation of benzene is less than the theoretical value
There are three carbon-carbon single bonds and three carbon-carbon double bonds.
It forms only one type of mono substituted product
The bond angle between carbon-carbon bonds is 120 Degree