JEE Chemistry Online Test Hydrocarbons Set G

1. Bond angle in alkenes is equal to

2.

3. Which of the following statements are correct ?
(i) Polynuclear hydrocarbons contain two or more benzene rings fused together.
(ii) Polynuclear hydrocarbons have carcinogenic property.
(iii) Polynuclear hydrocarbons are formed on incomplete combustion of organic materials like tobacco, coal and petroleum.
(iv) They are also produced in human body due to various biochemical reactions.

4. Which of the following statements are correct ?
(i) Alkynes on reduction with palladised charcoal form cis alkenes.
(ii) Alkynes on reduction with palladised charcoal form trans alkenes.
(iii) Alkynes on reduction with sodium in liquid ammonia form trans alkenes.
(iv) Propyne on reduction with palladised charcoal form a mixture of cis and trans propene.

5. Which of the following statements are correct ?
(i) Cis form of alkene is polar whereas trans form is non-polar
(ii) Cis form of alkene is non-polar whereas trans form is polar.
(iii) In case of solid alkenes the trans isomer has higher melting point than the cis isomer.
(iv) Cis and trans both form have same properties

6. Which of the following statements are correct ?
(i) Stability of conformation is affected due to torsional strain.
(ii) Magnitude of torsional strain depends upon the angle of rotation about C – C bond.
(iii) Eclipsed form has least torsional strain.
(iv) Staggered form has maximum torsional strain

7. Which of the following statement(s) is/are correct ?
(i) Alkanes can have infinite number of conformations by rotation around a C – C single bonds.
(ii) Rotation around C – C single bond is completely free.
(iii) Rotation is hindered by a small energy barrier of 1-20 kJ mol^–1 due to torsional strain

8. Which of the following statements are correct ?
(i) Decomposition reaction of higher alkanes into smaller fragments by the application of heat is called pyrolysis.
(ii) Pyrolysis and cracking are different processes.
(iii) Dodecane on pyrolysis gives a mixture of heptane and pentene.
(iv) Pyrolysis follow free radical mechanism.

9. Which of the following statements are correct ?
(i) The rate of reactivity of alkanes with halogens is F₂ > Cl₂ > Br₂ > I₂.
(ii) Rate of replacement of hydrogens of alkanes is 3° > 2º > 1°
(iii) Fluorination of alkanes is a very slow process.
(iv) Iodination of alkanes is too violent to be controlled

10. In the preparation of alkanes from hydrogenation of alkenes and alkynes. Finely divided catalysts are used which of the following statement(s) is/are correct regarding these catalysts
(i) Platinum and palladium catalyse the reaction at room temperature.
(ii) Nickel catalyse the reaction at relatively higher temperature and pressure.
(iii) Platinum and palladium catalyse the reaction at higher temperature

11. Which of the following statements are correct regarding structure of methane ?
(i) Methane has tetrahedral structure.
(ii) The bond angle between all H – C – H bonds is 109.5°.
(iii) The carbon atom is sp² hybridized.
(iv) C – C and C – H bond lengths are 154 pm and 112 pm respectively.

12. Which of the following statements are correct ?
(i) Saturated hydrocarbons contain only carbon-carbon single bonds.
(ii) Saturated hydrocarbons contain both carbon-carbon and carbon-hydrogen single bond.
(iii) Unsaturated hydrocarbons contain carbon-carbon double bonds.
(iv) Unsaturated hydrocarbons contain carbon-carbon double and triple bonds both.

13. Which of the following statements are correct ?
(i) LNG is obtained by liquefaction of natural gas.
(ii) Petrol is obtained by fractional distillation of petroleum.
(iii) Coal gas is obtained by destructive distillation of coal.
(iv) CNG is found in upper strata during drilling of oil wells

14. Benzene is highly unsaturated but it does not undergo addition reaction because

15. During the nitration of benzene. In the process of generation of nitronium ion sulphuric acid behaves as a/an ______ and nitric acid behave as a/an

16. The electrophilic substitutions reactions of benzene takes place via
(i) generation of electrophile
(ii) generation of nucleophile
(iii) formation of carbocation intermediate
(iv) removal of proton from the carbocation intermediate

17. AlCl₃ acts as ________ in Friedel-Crafts reaction

18. Benzene on reaction with ozone forms __________.

19. Benzene reacts with CH₃COCl + AlCl₃ to give

20.

21. Nitration of benzene by nitric acid and sulphuric acid is

22. Benzene can be obtained in the reaction

23. For the formation of toluene by Friedal Craft reaction, reactants used in presence of anhydrous AlCl₃ are

24. The strongest ortho - para and strongest meta - directing groups respectively are

25. Catalytic hydrogenation of benzene gives