MCQOPTIONS
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MCQOPTIONS
This section includes 155 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Which four of the following statements about alkenes are correct? |
| A. | At normal temperatures and pressures, the first six members are liquids. |
| B. | Their general formula is CNH2N |
| C. | Alkenes are unsaturated hydrocarbons |
| D. | Alkenes are insoluble in non-polar solvents such as cyclohexane |
| Answer» D. Alkenes are insoluble in non-polar solvents such as cyclohexane | |
| 52. |
The general formula for the alkenes is |
| A. | CnHn |
| B. | CnH2n+2 |
| C. | CnH2n-2 |
| D. | CnH2n |
| Answer» E. | |
| 53. |
How many isomers are there of pentane? |
| A. | 2 |
| B. | 1 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 54. |
How many other unsaturated isomers are there of pent-1-ene? |
| A. | 3 |
| B. | 1 |
| C. | 2 |
| D. | 4 |
| Answer» E. | |
| 55. |
How many cyclic isomers are there of pentene? |
| A. | 1 |
| B. | 3 |
| C. | 2 |
| D. | 4 |
| Answer» E. | |
| 56. |
The process of catalytic cracking involves using |
| A. | an aluminium catalyst to produce larger hydrocarbons |
| B. | an aluminium catalyst to produce smaller hydrocarbons |
| C. | an aluminium oxide catalyst to produce smaller hydrocarbons |
| D. | an aluminium oxide catalyst to produce larger hydrocarbons |
| Answer» D. an aluminium oxide catalyst to produce larger hydrocarbons | |
| 57. |
Which gas is obtained on treating aluminium carbide with diluted HCl |
| A. | Ethane |
| B. | Acetylene |
| C. | Methane |
| D. | Ethyne |
| Answer» D. Ethyne | |
| 58. |
The overlapping of orbitals in benzene is of the type |
| A. | p – p |
| B. | sp – sp |
| C. | 2 and 3 |
| D. | sp2– sp2 |
| Answer» D. sp2– sp2 | |
| 59. |
Organic compound can be formed by. |
| A. | Animals only |
| B. | Plants and animals and synthesis in laboratory |
| C. | Plants only |
| D. | Plants and animals only |
| Answer» C. Plants only | |
| 60. |
Gasoline has the formula |
| A. | C8– C10 |
| B. | C6– C8 |
| C. | C3– C5 |
| D. | C10– C12 |
| Answer» C. C3– C5 | |
| 61. |
n-pentane and iso pentane can be distinguished by |
| A. | Br2 |
| B. | N3 |
| C. | KMnO4 |
| D. | O3 |
| Answer» D. O3 | |
| 62. |
An aqueous solution of a substance on electrolysis gives ethane. The substance is |
| A. | Active acid |
| B. | Acetamide |
| C. | Potassium acetate |
| D. | Ethyl acetate |
| Answer» D. Ethyl acetate | |
| 63. |
Pyrolysis of coal with heavy oil in presence of H2 at 250 atm. 350oC and catalyst yields. |
| A. | A mixture of low boiling hydrocarbons |
| B. | CH4 |
| C. | C3H8 |
| D. | C2H6 |
| Answer» B. CH4 | |
| 64. |
Organic compounds are found only in. |
| A. | Animal kingdom |
| B. | Mineral kingdom |
| C. | Vegetable kingdom |
| D. | Both animal and vegetable kingdom |
| Answer» E. | |
| 65. |
Marsh gas mainly contains |
| A. | C2H2 |
| B. | CO |
| C. | CH4 |
| D. | H2S |
| Answer» D. H2S | |
| 66. |
Ethyl alcohol is heated with conc. H2SO The product formed is |
| A. | C2H6 |
| B. | C2H2 |
| C. | C2H4 |
| D. | CH3COOC2H5 |
| Answer» B. C2H2 | |
| 67. |
The ethyne produced in the laboratory contains two known impurities which are removed by passing them through an acidified copper sulfate solution. These impurities are |
| A. | hydrogen sulfate and phosphine |
| B. | copper sulfide and potassium |
| C. | hydrogen sulfide and phosphine |
| D. | hydrogen sulfide and potassium |
| Answer» D. hydrogen sulfide and potassium | |
| 68. |
Organic compounds are separated into groups called homologous series. Which one of the following is not a property of a homologous series? |
| A. | All members have the same general formula. |
| B. | Successive members differ by CH |
| C. | They have similar chemical properties. |
| D. | They have similar physical properties. |
| Answer» E. | |
| 69. |
In hydrocarbons, the C and H bonds are joined together by |
| A. | ionic bonds |
| B. | hydrogen bonds |
| C. | dipole-dipole attractions |
| D. | covalent ions |
| Answer» E. | |
| 70. |
Which three of the following are properties of alkynes? |
| A. | They are all soluble in water. |
| B. | Alkynes have similar physical properties. |
| C. | The lower members are gases at normal temperatures and pressures. |
| D. | Alkynes are soluble in non-polar solvents like methylbenzene. |
| Answer» C. The lower members are gases at normal temperatures and pressures. | |
| 71. |
The main source of most organic compound is |
| A. | methane |
| B. | petroleum |
| C. | coal tar |
| D. | both (a) and (b) |
| Answer» E. | |
| 72. |
What product is obtained by heating ethylidene chloride with alcoholic KOH |
| A. | Ethene |
| B. | Ethane |
| C. | Ethyne |
| D. | Methane |
| Answer» D. Methane | |
| 73. |
Which statement about benzene is correct? |
| A. | Benzene reacts with bromine solution as if it is unsaturated |
| B. | Benzene is an isomer of cyclohexane |
| C. | Benzene undergoes addition reactions more readily than hexene |
| D. | The ratio of carbon to hydrogen atoms in benzene is the same as in ethyne |
| Answer» E. | |
| 74. |
What product is obtained by passing ethanol vapours over heated alumina |
| A. | CH4 |
| B. | C2H4 |
| C. | C2H6 |
| D. | C2H2 |
| Answer» C. C2H6 | |
| 75. |
Water product is obtained on electrolyzing potassium fumarate |
| A. | C2H4 |
| B. | CH4 |
| C. | C2H2 |
| D. | C2H6 |
| Answer» D. C2H6 | |
| 76. |
Domestic cooking gas consists of mostly |
| A. | Liquefied butane and isobutene |
| B. | Methane and ethane |
| C. | C2H4 and CO |
| D. | H2 and acetylene |
| Answer» B. Methane and ethane | |
| 77. |
Which hydrocarbon has a molecular formula different from that of the other three? |
| A. | 2,3-dimethylpentane |
| B. | 2,2,3,3-tetramethylbutane |
| C. | 2,2,3-trimethylbutane |
| D. | 3-ethylpentane |
| Answer» C. 2,2,3-trimethylbutane | |
| 78. |
Liquid hydrocarbon is converted to a mixture of gaseous hydrocarbons by |
| A. | Oxidation |
| B. | Cracking |
| C. | Hydrolysis |
| D. | Distillation under reduced pressure |
| Answer» C. Hydrolysis | |
| 79. |
Which of the following is used as antiknock? |
| A. | T E L |
| B. | Lead tetrachloride |
| C. | Lead acetate |
| D. | Ethyl acetate |
| Answer» B. Lead tetrachloride | |
| 80. |
Out of the following fractions of petroleum, the one having the lowest boiling point is or Which of the following is obtained at lowest temperature by fractional distillation of petroleum [MP PMT 1993; MP PET 1996] |
| A. | Kerosene |
| B. | Diesel oil |
| C. | Gasoline |
| D. | Heavy oil |
| Answer» D. Heavy oil | |
| 81. |
Formation of 2-butene as major product by dehydration of 2-butanol is according to [MP PMT 1995] |
| A. | Markownikoff rule |
| B. | Saytzeff rule |
| C. | Peroxide effect |
| D. | Anti-Markownikoff rule |
| Answer» C. Peroxide effect | |
| 82. |
If ethylene, carbon monoxide and water is heated at high temperature, which of the following is formed [AIIMS 2000] |
| A. | \[{{C}_{4}}{{H}_{8}}{{O}_{2}}\] |
| B. | \[{{C}_{2}}{{H}_{5}}COOH\] |
| C. | \[C{{H}_{3}}COOH\] |
| D. | \[C{{H}_{2}}=CH-COOH\] |
| Answer» C. \[C{{H}_{3}}COOH\] | |
| 83. |
The addition of HBr is easiest with \[\] [MP PMT 2000] |
| A. | \[ClC{{H}_{2}}=CHCl\] |
| B. | \[ClCH=CHCl\] |
| C. | \[C{{H}_{3}}-CH=C{{H}_{2}}\] |
| D. | \[{{(C{{H}_{3}})}_{2}}C=C{{H}_{2}}\] |
| Answer» E. | |
| 84. |
Nitrobenzene can be prepared from benzene by using a mixture of conc. \[HN{{O}_{3}}\] and conc. \[{{H}_{2}}S{{O}_{4}}.\] In the nitrating mixture, \[HN{{O}_{3}}\] acts as a [IIT-JEE 1997] |
| A. | Base |
| B. | Acid |
| C. | Reducing agent |
| D. | Catalyst |
| Answer» B. Acid | |
| 85. |
Acetylene reacts with \[HCN\] in the presence of \[Ba{{(CN)}_{2}}\]to yield [UP SEAT 2004] |
| A. | 1, 1-dicyanoethane |
| B. | 1, 2-dicyanoethane |
| C. | Vinyl cyanide |
| D. | None of these |
| Answer» D. None of these | |
| 86. |
The reaction \[C{{H}_{3}}CH=C{{H}_{2}}\underset{{{H}^{^{+}}}}{\mathop{\xrightarrow{(CO+{{H}_{2}})}}}\,C{{H}_{3}}-\underset{COOH\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{CH-C{{H}_{3}}}}\,\,\,\,\,\,}}\,\,\,\] is known as [MP PMT 2002] |
| A. | Wurtz reaction |
| B. | Koch reaction |
| C. | Clemmensen reduction |
| D. | Kolbe?s reaction |
| Answer» C. Clemmensen reduction | |
| 87. |
Which of the following yield both alkane and alkene [AFMC 2004] |
| A. | Kolbe?s reaction |
| B. | Williamson?s synthesis |
| C. | Wurtz reaction |
| D. | Sandmeyer reaction |
| Answer» B. Williamson?s synthesis | |
| 88. |
Benzene is obtained from [CPMT 1996] |
| A. | Coaltar |
| B. | Plant |
| C. | Animal |
| D. | Charcoal |
| Answer» B. Plant | |
| 89. |
In chlorination of benzene, the reactive species is [MP PET 2000] |
| A. | \[C{{l}^{+}}\] |
| B. | \[C{{l}^{-}}\] |
| C. | \[C{{l}_{2}}\] |
| D. | \[C{{l}_{2}}^{-}\] |
| Answer» B. \[C{{l}^{-}}\] | |
| 90. |
After ozonolysis of benzene (not hydrolysis), the product is [RPMT 1997; CPMT 1997] |
| A. | Benzene triozonide |
| B. | Glyoxal |
| C. | Ethanediol |
| D. | All of them |
| Answer» B. Glyoxal | |
| 91. |
Which of the following is not formed by the ozonolysis of o-xylene |
| A. | Glyoxal |
| B. | Ethyl glyoxal |
| C. | Dimethyl glyoxal |
| D. | Methyl glyoxal |
| Answer» C. Dimethyl glyoxal | |
| 92. |
How is is widely used [MP PET 2002] |
| A. | Insecticide |
| B. | Drug |
| C. | Explosive |
| D. | Dye |
| Answer» D. Dye | |
| 93. |
Benzene shows [RPMT 1999] |
| A. | Substitution |
| B. | Addition |
| C. | Oxidation |
| D. | All of these |
| Answer» E. | |
| 94. |
Amongst the following, the compound that can be most readily sulphonated is [IIT-JEE 1982; MADT Bihar 1995; KCET 2005] |
| A. | Benzene |
| B. | Nitrobenzene |
| C. | Toluene |
| D. | Chlorobenzene |
| Answer» D. Chlorobenzene | |
| 95. |
o, p-directing groups are mostly |
| A. | Activating groups |
| B. | Deactivating groups |
| C. | Neutral groups |
| D. | None of these |
| Answer» B. Deactivating groups | |
| 96. |
Which xylene is most easily sulphonated |
| A. | Ortho |
| B. | Para |
| C. | Meta |
| D. | All at the same rate |
| Answer» D. All at the same rate | |
| 97. |
The reaction of benzene with chlorine in the presence of iron gives [MP PET 1993] |
| A. | Benzene hexachloride |
| B. | Chlorobenzene |
| C. | Benzyl chloride |
| D. | Benzoyl chloride |
| Answer» C. Benzyl chloride | |
| 98. |
The most stable carbonium ion among the following is [JIPMER 2002; AFMC 2002] |
| A. | \[{{C}_{6}}{{H}_{5}}\overset{+}{\mathop{C}}\,H{{C}_{6}}{{H}_{5}}\] |
| B. | \[{{C}_{6}}{{H}_{5}}\overset{+}{\mathop{C}}\,{{H}_{2}}\] |
| C. | \[C{{H}_{3}}\overset{+}{\mathop{C}}\,{{H}_{2}}\] |
| D. | \[{{C}_{6}}{{H}_{5}}C{{H}_{2}}\overset{+}{\mathop{C}}\,{{H}_{2}}\] |
| Answer» B. \[{{C}_{6}}{{H}_{5}}\overset{+}{\mathop{C}}\,{{H}_{2}}\] | |
| 99. |
The number of \[\pi -\text{bonds}\] in the product formed by passing acetylene through dilute sulphuric acid containing mercuric sulphate is [EAMCET 1997] |
| A. | Zero |
| B. | One |
| C. | Two |
| D. | Three |
| Answer» C. Two | |
| 100. |
The hybridisation in methane, ethene and Ethyne respectively is [CPMT 2003] |
| A. | sp3, sp2 and sp |
| B. | sp3, sp, sp2 |
| C. | sp2, sp3 and sp |
| D. | sp3, sp2, sp |
| Answer» B. sp3, sp, sp2 | |