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| Chemistry 10th Chapter 12 Hydrocarbons Questions Bank |
Chemistry 10th Chapter 12 Hydrocarbons Solved MCQs, Short and Long Questions
Select the right Answer.
1. A hydrocarbon has molecular formula C₈H₁₄. What is the molecular formula of the next member of the same homologous series?
2. A solution of bromine in water having colour
3. Acetylene is slightly soluble in:
4. Addition of hydrogen is called
5. Alcohol is soluble in water due to
6. Alkanes are also called
7. Alkanes having carbon range are liquid
8. Alkenes are insoluble in
9. Alkenes are prepared from alcohols by a process called
10. Alkenes is also called
11. Alkyne forms
12. Alkynes being more reactive than
13. Amorphous forms of carbons are
14. Banana when riped produces gas
15. Banaspati Ghee is also called
16. By which process is alkene prepared from alcohol?
17. Carbon has valency:
18. Dehalogenation of tetrahalides produces acetylene in the presence of:
19. Dehalogenation of tetrahalides produces acetylene. This reaction takes place in the presence of
20. Dehydration of alcohol can be carried out with:
21. Dehydrohalogenation of alkyl halides take place in the presence of
22. Dehydrohalogenation of ethyl bromide gives:
23. Dehydrohalogenation takes place in the presence of
24. Dehydrohalogenations of vicinal dihalides takes place in the presence of:
25. Detergents are the sodium salts of
26. Di-methyl acetylene is also called
27. Due to increase in molar mass which property increases
28. Due to which property alkane are used a fuel
29. Ethene reacts with H₂SO₄ at temperature of
30. Ethylene oxide is used as
31. Formula of nascent hydrogen is
32. Glyoxal is oxidize into
33. Halogenation of methane does not produce which one of the following:
34. Halogenation of methane in direct sunlight, does not produce the compound:
35. Halogenation of methane in the presence of diffused sunlight takes place
36. Hydrocarbons having double bond are
37. Hydrocarbons having high molecular mass are:
38. Identify the saturated hydrocarbon
39. If an organic compound has 4 carbon atoms, all singly bonded, it will have the following characteristics except one
40. Incomplete combustion of alkanes produce
41. Methane forms about percent of natural gas.
42. Methane is also called
43. Number of bonds in propene is
44. Number of bonds present in methane
45. One of the hydrocarbons reacts with one mole of hydrogen to form a saturated hydrocarbon. What formula could be of the X?
46. Oxidation of alkenes produces:
47. Oxidation of ethene with KMnO₄ produces
48. Paraffin is another name for:
49. paraffins means
50. Substitution reaction is the characteristics of
51. The chemical formula of glyoxal is:
52. The compound having at least one benzene ring are called
53. The compounds in which two carbon atoms are linked by a double bond are called:
54. The density of alkane increases with the increase of
55. The end product of oxidation of acetylene is
56. The example of rubber’s are:
57. The formula of oxalic acid is
58. The general formula of saturated hydrocarbons is:
59. The molecular formulae of the first three members of the alkane hydrocarbons are CH₄ , C₂116 and C₃H₈. What is the molecular formula for the eighth alkane member, octane, which is found in petrol?
60. The order of reactivity of hydrogen halides with alkenes is
61. The reduction of alkyl halides takes place in the presence of
62. The simplest alkyne is:
63. Traces of acetylene are present in coal gas about
64. What is the formula of methane
65. What is the most necessary condition for the reaction of CH₄ with halogen?
66. Which among the following is a synthetic fibre
67. Which among the following is’nt a hydrocarbon?
68. Which are the characteristics property of alkanes
69. Which compound is used for welding process
70. Which hydrocarbon molecule would have no effect on an aqueous solution of bromine?
71. Which is used as Antifreeze
72. Which of the following does not occur free in nature
73. Which of the following has higher energy
74. Which of the following is a saturated hydrocarbon?
75. Which of the following is not a example of open chain hydrocarbon
76. Which of the following is not a function of chloroform
77. Which of the following is not a saturated hydrocarbon?
78. Which of the following is not alcohol
79. Which of the following is not an organic solvent
80. Which of the following is use for ripening of fruits?
81. Which of the following property is not present in hydrocarbons?
82. Which of the following reaction is used on industrial state to convert vegetable oil into margarine/ghee?
83. Which one of the followings is a substitution reaction?
84. Which one of these hydrocarbon molecules would have no effect .on an aqueous solution of bromine? -
85. Which one of these is a saturated hydrocarbon?
Short Questions
1. A compound consisting of four carbon atoms has a triple bond in it. How many hydrogen atoms are present in it?
2. Both alkenes and alkynes are unsaturated hydrocarbons. State the one most significant difference between them.
3. Define alkanes and give one example.
4. Define alkynes. Give example.
5. Define hydrocarbons.
6. Define reduction reactions. Give example
7. Define saturated hydrocarbons.
8. Define substitution reactions.
9. Define unsaturated hydrocarbons with examples.
10. Describe the combustion process with equation.
11. Differentiate between saturated and unsaturated hydrocarbons.
12. Give a few physical properties of alkanes.
13. Give a few physical properties of alkenes.
14. Give a few uses of Ethene.
15. Give a few uses of methane and ethane.
16. Give a test used to identify unsaturation of an organic compound.
17. Give any four physical properties of alkanes.
18. Give any two physical properties of acetylene.
19. Give the characteristics of polysaccharides.
20. Give the general formula of alkenes and alkynes.
21. Give the general formulae of saturated and unsaturated hydrocarbons.
22. Give the structural formula: iso-pentane and iso-butane.
23. How are alkyl halides reduced?
24. How can you prepare acetylene from tetrachloroethane?
25. How can you prepare Ethene from alcohol and ethyl bromide?
26. How can you prepare ethene from ethyl bromide?
27. How can you prepare propene from propyl alcohol?
28. How halogenation of alkenes take place?
29. How is tetrabromoethane prepared from acetylene?
30. How many types of open chain hydrocarbons have?
31. Identify Ethane from Ethene with a chemical test.
32. Justify that alkanes give substitution reactions.
33. Prepare dichloromethane from methane.
34. State any two uses of ethane.
"35. State one important use of each:
(i) Ethene (ii) Acetylene
(iii) Chloroform
(iv) Carbon tetrachloride"
36. State the most significant difference between alkenes and alkynes.
37. State the physical properties of alkenes.
38. State the prime source of alkanes.
39. What are addition reactions? Explain with an example.
40. What are aliphatic hydrocarbons?
41. What are alkenes? Give their general formula.
42. What are alkynes? Write their general formula.
43. What are Cyclic hydrocarbons?
44. What are hydrocarbons?
45. What are saturated hydrocarbons? Give one example.
46. What are the addition reactions? Explain with an example.
47. What do you know about hydrogenation of alkenes?
48. What do you know about hydrogenation of alkenes?
49. What do you mean by halogenation? Give the reaction of methane with chlorine in bright sunlight.
50. What is the difference between a straight and a branched chain hydrocarbon?
51. What is the difference between a straight chain and a branched chain hydrocarbon?
52. What is the difference between glycol and glyoxal?
53. What is the importance of hydrogenation on industrial scale?
54. What is the percentage of methane in natural gas?
55. Why alkane can’t be oxidized with KMnO₄ solution?
56. Why alkanes show substitution reactions?
57. Why are alkanes called paraffins?
58. Why are alkenes called olefins?
59. Why are alkenes more reactive than alkane?
60. Why are hydrocarbons considered as parent organic compounds?
61. Why are hydrocarbons soluble in organic solvents?
62. Why are the alkanes used as fuel?
63. Why are the alkenes called ‘olefins’?
64. Why does colour of bromine water discharge on addition of Ethene in it?
65. Why is combustion of alkanes in limited supply of oxygen harmful?
66. Why the alkanes are called paraffins?
67. Why the alkynes are called acetylenes?
68. Why the burning of alkanes requires sufficient supply of oxygen?
69. Write the formula of oxalic acid and glyoxal.
70. Write the molecular, dot and cross and structural formula of ethyne.
71. Write the names of two unsaturated hydrocarbons.
72. Write the physical properties of alkynes.
73. Write the sources of alkanes.
74. Write the uses of acetylene.
Long Questions
1. Define alkenes. Describe two methods of preparation of alkenes.
2. Define hydrocarbons. Explain the types of hydrocarbons.
3. Describe the uses of ethene.
4. Explain oxidation of acetylene.
5. Explain oxidation of alkene.
6. How alkenes are prepared by dehydration of alcohols?
7. State physical properties of alkynes.
8. What are saturated hydrocarbons? Give the methods of preparation of saturated hydrocarbons.
9. What type of reactions are given by alkanes? Explain with reference to halogenation of alkanes.
10. Write chemical properties of alkynes.
11. Write down the methods of preparation of alkanes.
12. Write down the physical properties of alkanes.
13. Write down the physical properties of alkenes.
14. Write down the uses of acetylene.
15. Write the sources of alkanes.
16. Write the uses of methane and ethane.
17. Write three chemical reactions of alkenes.
18. Write two methods of preparation of acetylene.