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.
| 101. |
Distinction in pentene-1 and pentyne-1 is done by [CPMT 1996] |
| A. | \[{{[Ag{{(N{{H}_{3}})}_{2}}]}^{+}}\] |
| B. | Conc. \[{{H}_{2}}S{{O}_{4}}\] |
| C. | HCl |
| D. | \[B{{r}_{2}}\] |
| Answer» B. Conc. \[{{H}_{2}}S{{O}_{4}}\] | |
| 102. |
Acetylene gas when passed through the 20% \[{{H}_{2}}S{{O}_{4}}\text{ at }{{80}^{o}}C\] gives acetaldehyde. The catalyst required for this conversion is [CPMT 1983] |
| A. | Anhydrous \[AlC{{l}_{3}}\] |
| B. | \[HgS{{O}_{4}}\] |
| C. | Pd |
| D. | Pt |
| Answer» C. Pd | |
| 103. |
Which of the following is not a member of homologous series [RPMT 2002] |
| A. | Ethene |
| B. | 1-butene |
| C. | 2-butene |
| D. | 2-butyne |
| Answer» E. | |
| 104. |
Carbon-carbon bond length is minimum in [CBSE PMT 1988, 91; MNR 1984; CPMT 1989; RPMT 1997; Pb. PMT 2001] |
| A. | Ethane |
| B. | Ethene |
| C. | Ethyne |
| D. | Benzene |
| E. | Ethanol |
| Answer» D. Benzene | |
| 105. |
Which of the following has acidic hydrogen [IIT-JEE 1985, 89; CPMT 1986; Bihar MEE 1997; RPET 1999; AFMC 1999] |
| A. | Ethyne |
| B. | Ethene |
| C. | Ethane |
| D. | Benzene |
| Answer» B. Ethene | |
| 106. |
Which of the following catalyst is used in the polymerisation of \[CH\equiv CH\] to \[{{C}_{6}}{{H}_{6}}\] [CPMT 1999] |
| A. | \[AlC{{l}_{3}}\] |
| B. | \[HgS{{O}_{4}}\] |
| C. | \[NbC{{l}_{3}}\] |
| D. | HCl |
| Answer» B. \[HgS{{O}_{4}}\] | |
| 107. |
A compound is treated with \[NaN{{H}_{2}}\] to give sodium salt. Identify the compound [AFMC 1998] |
| A. | \[{{C}_{2}}{{H}_{2}}\] |
| B. | \[{{C}_{6}}{{H}_{6}}\] |
| C. | \[{{C}_{2}}{{H}_{6}}\] |
| D. | \[{{C}_{2}}{{H}_{4}}\] |
| Answer» B. \[{{C}_{6}}{{H}_{6}}\] | |
| 108. |
1-butyne reacts with cold alkaline \[KMn{{O}_{4}}\] to produce [AIIMS 1997] |
| A. | \[C{{H}_{3}}C{{H}_{2}}COOH\] |
| B. | \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}COOH\] |
| C. | \[C{{H}_{3}}C{{H}_{2}}COOH+C{{O}_{2}}\] |
| D. | \[C{{H}_{3}}C{{H}_{2}}COOH+HCOOH\] |
| Answer» D. \[C{{H}_{3}}C{{H}_{2}}COOH+HCOOH\] | |
| 109. |
An unknown compound A has a molecular formula \[{{C}_{4}}{{H}_{6}}.\] When A is treated with an excess of \[B{{r}_{2}}\] a new substance B with formula \[{{C}_{4}}{{H}_{6}}B{{r}_{4}}\] is formed. A forms a white precipitate with ammoniacal silver nitrate solution. A may be [MP PET/PMT 1998] |
| A. | Butyne-1 |
| B. | Butyne-2 |
| C. | Butene-1 |
| D. | Butene-2 |
| Answer» B. Butyne-2 | |
| 110. |
Hydrocarbon containing following bond is most reactive [AIIMS 1987] |
| A. | \[C\equiv C\] |
| B. | C = C |
| C. | C - C |
| D. | All of these |
| Answer» B. C = C | |
| 111. |
Poisonous gas 'Lewissite' is obtained by the reaction of [MP PMT 2003] |
| A. | \[CH\equiv CH\] and \[AsC{{l}_{3}}\] |
| B. | \[C{{H}_{2}}=C{{H}_{2}}\] and \[AsC{{l}_{3}}\] |
| C. | \[CH\equiv CH\] and \[{{S}_{2}}C{{l}_{2}}\] |
| D. | \[C{{H}_{2}}=C{{H}_{2}}\] and \[NOCl\] |
| Answer» B. \[C{{H}_{2}}=C{{H}_{2}}\] and \[AsC{{l}_{3}}\] | |
| 112. |
Which reacts with ammoniacal \[AgN{{O}_{3}}\] [Orissa JEE 2005] |
| A. | Propyne |
| B. | 2-butyne |
| C. | 1,3-butadiene |
| D. | Pentene |
| Answer» B. 2-butyne | |
| 113. |
In the following reaction \[C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{3}}\underset{475K}{\mathop{\xrightarrow{{{H}_{2}}S{{O}_{4}}}}}\,\] [AIIMS 1983] |
| A. | \[C{{H}_{3}}CH=CHC{{H}_{3}}\] predominates |
| B. | \[C{{H}_{2}}=CHC{{H}_{2}}C{{H}_{3}}\] predominates |
| C. | Both are formed in equal amounts |
| D. | The amount of production depends on the nature of catalyst |
| Answer» B. \[C{{H}_{2}}=CHC{{H}_{2}}C{{H}_{3}}\] predominates | |
| 114. |
Ozonolysis of 2-methyl butene-2 yields |
| A. | Only aldehyde |
| B. | Only ketone |
| C. | Both aldehyde and ketone |
| D. | None of these |
| Answer» D. None of these | |
| 115. |
Propene when heated with chlorine at about \[{{500}^{o}}C\] forms [MP PET 1997] |
| A. | \[C{{H}_{2}}Cl.CH=C{{H}_{2}}\] |
| B. | \[C{{H}_{3}}.CHCl.C{{H}_{2}}Cl\] |
| C. | \[C{{H}_{2}}Cl.CHCl.C{{H}_{2}}Cl\] |
| D. | All the three |
| Answer» B. \[C{{H}_{3}}.CHCl.C{{H}_{2}}Cl\] | |
| 116. |
Bayer?s reagent is used for detection of [RPMT 2002] |
| A. | Amines |
| B. | Glucose |
| C. | Unsaturated bond |
| D. | Alcohol |
| Answer» D. Alcohol | |
| 117. |
\[\begin{matrix} {{H}_{3}}C & {} & C{{H}_{3}}\\ {} & >C=C< & {}\\ {{H}_{3}}C & {} & C{{H}_{3}}\\ \end{matrix}\underset{KOH\,\text{(heat)}}{\mathop{\xrightarrow{X}}}\,\begin{matrix} C{{H}_{3}} & {} & C{{H}_{3}}\\ {} & >C=O+O=C< & {}\\ C{{H}_{3}} & {} & C{{H}_{3}}\\ \end{matrix}\] \[X\] in the above reaction is [CPMT 1985, 93] |
| A. | \[HN{{O}_{3}}\] |
| B. | \[{{O}_{2}}\] |
| C. | \[{{O}_{3}}\] |
| D. | \[KMn{{O}_{4}}\] |
| Answer» E. | |
| 118. |
The compound most likely to decolourize a solution of potassium permanganate is [NCERT 1978] |
| A. | \[C{{H}_{3}}C{{H}_{3}}\] |
| B. | \[C{{H}_{3}}CH=CHC{{H}_{2}}C{{H}_{3}}\] |
| C. | \[\underset{\,\,\,\,\,C{{H}_{3}}}{\mathop{\underset{|}{\mathop{\overset{\,\,\,\,\,\,C{{H}_{3}}}{\mathop{\overset{|}{\mathop{C{{H}_{3}}-C-C{{H}_{3}}}}\,}}\,}}\,}}\,\] |
| Answer» D. | |
| 119. |
A hydrocarbon reacts with hypochlorous acid to give 1-chloro-2-hydroxyethane. The hydrocarbon is [CBSE PMT 1989] |
| A. | Ethylene |
| B. | Methane |
| C. | Ethane |
| D. | Acetylene |
| Answer» B. Methane | |
| 120. |
A gas formed by the action of alcoholic KOH on ethyl iodide, decolorises alkaline \[KMn{{O}_{4}}\] solution. The gas is [CPMT 1974, 91; MP PET 1985; IIT-JEE 1982] |
| A. | \[C{{H}_{4}}\] |
| B. | \[{{C}_{2}}{{H}_{6}}\] |
| C. | \[{{C}_{2}}{{H}_{4}}\] |
| D. | \[{{C}_{2}}{{H}_{2}}\] |
| Answer» D. \[{{C}_{2}}{{H}_{2}}\] | |
| 121. |
In a reaction, if half of the double bond is broken and two new bonds are formed, this is a case of [AMU 1983; NCERT 1978; CPMT 1983] |
| A. | Elimination |
| B. | Addition |
| C. | Displacement |
| D. | Rearrangement |
| Answer» C. Displacement | |
| 122. |
Which of the following is not used to distinguish ethene from ethane [KCET (Med.) 2001; UPSEAT 2002; CBSE PMT 2002] |
| A. | Iodine in \[CC{{l}_{4}}\] |
| B. | Bromine in \[CC{{l}_{4}}\] |
| C. | Alkaline \[KMn{{O}_{4}}\] |
| D. | Ammonical \[C{{u}_{2}}C{{l}_{2}}\] |
| Answer» E. | |
| 123. |
Which of the following has highest knocking property |
| A. | Aromatic hydrocarbons |
| B. | Olefins |
| C. | Branched chain paraffins |
| D. | Straight chain paraffins |
| Answer» E. | |
| 124. |
Ozonolysis of which one of the following will give two molecules of acetaldehyde [Bihar MEE 1997; MP PET 2000] |
| A. | 1-butene |
| B. | 2-butene |
| C. | 1-pentene |
| D. | 2-pentene |
| E. | None of these |
| Answer» C. 1-pentene | |
| 125. |
The reaction of HBr with \[\overset{\overset{\,\,\,\,\,\,C{{H}_{3}}}{\mathop{|\,}}\,}{\mathop{C{{H}_{3}}-C=C{{H}_{2}}}}\,\] in the presence of peroxide will give [BHU 2005] |
| A. | \[\underset{\underset{C{{H}_{3}}}{\mathop{|\,\,\,\,\,\,\,}}\,}{\mathop{C{{H}_{3}}CBrC{{H}_{3}}}}\,\] |
| B. | CH3CH2CH2CH2Br |
| C. | \[\overset{\overset{C{{H}_{3}}}{\mathop{|\,\,\,\,\,\,\,\,\,\,\,}}\,}{\mathop{C{{H}_{3}}CHC{{H}_{2}}Br}}\,\] |
| D. | \[\overset{\overset{\,\,\,\,\,\,\,\,\,\,\,\,\,C{{H}_{3}}}{\mathop{\,\,\,\,\,\,\,\,\,\,|}}\,}{\mathop{C{{H}_{3}}C{{H}_{2}}CHC{{H}_{3}}}}\,\] |
| Answer» D. \[\overset{\overset{\,\,\,\,\,\,\,\,\,\,\,\,\,C{{H}_{3}}}{\mathop{\,\,\,\,\,\,\,\,\,\,|}}\,}{\mathop{C{{H}_{3}}C{{H}_{2}}CHC{{H}_{3}}}}\,\] | |
| 126. |
In the reaction, \[{{H}_{2}}C=C{{H}_{2}}\xrightarrow{\begin{smallmatrix} \text{cold alkaline} \\ \text{KMn}{{\text{O}}_{\text{4}}} \end{smallmatrix}}(A)\]: Product A is : [Pb. CET 2000] |
| A. | Ethylene glycol |
| B. | Acetic acid |
| C. | Ethane |
| D. | Butyric acid |
| Answer» B. Acetic acid | |
| 127. |
?The negative part of addenda adds on to the carbon atom linked with least number of hydrogen atoms?. This statement is called [DPMT 1982; AIIMS 1988; AFMC 2004] |
| A. | Thiele's principle |
| B. | Bayer's strain theory |
| C. | Markownikoff's rule |
| D. | Peroxide effect |
| Answer» D. Peroxide effect | |
| 128. |
Chlorination can be done on |
| A. | \[C{{H}_{3}}-CH=C{{h}_{2}}\] |
| B. | \[C{{H}_{2}}=C{{H}_{2}}\] |
| C. | CH º CH |
| D. | None of these |
| Answer» B. \[C{{H}_{2}}=C{{H}_{2}}\] | |
| 129. |
An alkene given two moles of HCHO, one mole of \[C{{O}_{2}}\]and one mole of \[C{{H}_{3}}COCHO\]on ozonolysis. What is its structure [Orissa JEE 2003] |
| A. | \[C{{H}_{2}}=C=CH-C{{H}_{2}}-C{{H}_{3}}\] |
| B. | \[C{{H}_{2}}=CH-\overset{C{{H}_{3}}}{\mathop{\overset{\,\,|\,\,\,\,\,\,\,\,\,\,\,}{\mathop{CH\,-}}\,}}\,CH=C{{H}_{2}}\] |
| C. | \[C{{H}_{2}}=C=\underset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,\,\,}{\mathop{C\,-\,}}\,}}\,C{{H}_{3}}\] |
| D. | \[C{{H}_{2\,}}=C=\overset{C{{H}_{3}}}{\mathop{\,\overset{|\,\,\,\,\,\,\,\,\,\,\,}{\mathop{C\,\,\,-\,}}\,}}\,CH=C{{H}_{2}}\] |
| Answer» E. | |
| 130. |
A hydrocarbon containing 2 carbon atoms gives Sabatier and Senderen's reaction but does not give precipitate with ammoniacal silver nitrate solution. The hydrocarbon in the question is [MADT Bihar 1983] |
| A. | Ethane |
| B. | Acetylene |
| C. | Ethylene |
| D. | None of these |
| Answer» D. None of these | |
| 131. |
Position of double bond in an organic compound is determined by [DCE 2001; RPMT 2002] |
| A. | Ozonolysis |
| B. | Oxidation |
| C. | Reduction |
| D. | Hydrogenation |
| Answer» B. Oxidation | |
| 132. |
Decolourization of alkaline \[KMn{{O}_{4}}\] is used as a test for [AMU 1983] |
| A. | Aromatic hydrocarbons |
| B. | Olefinic hydrocarbons |
| C. | Acetylenic hydrocarbons |
| D. | Cycloalkanes |
| Answer» C. Acetylenic hydrocarbons | |
| 133. |
How many gm of bromine will react with 21 gm \[{{C}_{3}}{{H}_{6}}\] [MP PET 1985] |
| A. | 80 |
| B. | 160 |
| C. | 240 |
| D. | 320 |
| Answer» B. 160 | |
| 134. |
Deviation from Markownikoff's rule occurs in presence of |
| A. | Zinc |
| B. | Peroxides |
| C. | \[Hg-Zn/HCl\] |
| D. | All of these |
| Answer» C. \[Hg-Zn/HCl\] | |
| 135. |
The order of appearance of the following with rising temperature during the refining of crude oil is[MNR 1993; UPSEAT 2002] |
| A. | Kerosene oil, gasoline, diesel |
| B. | Diesel, gasoline, kerosene oil |
| C. | Gasoline, diesel, kerosene oil |
| D. | Gasoline, kerosene oil, diesel |
| Answer» E. | |
| 136. |
Fischer Tropsch process is used for the manufacture of [DCE 1999; MP PET 2003] |
| A. | Synthetic petrol |
| B. | Thermosetting plastics |
| C. | Ethanol |
| D. | Benzene |
| Answer» B. Thermosetting plastics | |
| 137. |
Which of the following statements is incorrect ? The members of the homologous series of alkanes [NCERT 1974] |
| A. | Are all straight chain compounds |
| B. | Have the general formula \[{{C}_{n}}{{H}_{2n+2}}\] |
| C. | Have similar chemical properties |
| D. | Show a regular gradation of physical properties |
| Answer» B. Have the general formula \[{{C}_{n}}{{H}_{2n+2}}\] | |
| 138. |
In the reaction \[C{{H}_{3}}-Br+2Na+Br-C{{H}_{3}}\to \], the product called [Pb. CET 1999; CPMT 1983. 86; KCET 1992; MP PMT 1994; BHU 1998; MP PMT 2002; MP PET 1986] |
| A. | Wurtz reaction |
| B. | Aldol condensation |
| C. | Perkin's reaction |
| D. | Levit reaction |
| Answer» B. Aldol condensation | |
| 139. |
What is the chief product obtained when n-butane is treated with bromine in the presence of light at \[{{130}^{o}}C\] [IIT-JEE 1995] |
| A. | \[\underset{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{{H}_{3}}}{\mathop{\underset{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|}{\mathop{C{{H}_{3}}-C{{H}_{2}}-CH-Br}}\,}}\,\] |
| B. | \[\underset{C{{H}_{3}}\,\,\,\,\,\,\,\,}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{C{{H}_{3}}-CH-C{{H}_{2}}-Br}}\,}}\,\] |
| C. | \[\underset{\,\,\,\,\,\,\,\,\,C{{H}_{3}}}{\mathop{\underset{\,\,\,\,|}{\mathop{\overset{\,\,\,\,\,\,\,\,\,\,\,C{{H}_{3}}}{\mathop{\overset{\,\,\,\,\,\,|}{\mathop{C{{H}_{3}}-C-Br}}\,}}\,}}\,}}\,\] |
| D. | \[C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{2}}-Br\] |
| Answer» B. \[\underset{C{{H}_{3}}\,\,\,\,\,\,\,\,}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{C{{H}_{3}}-CH-C{{H}_{2}}-Br}}\,}}\,\] | |
| 140. |
Which of the following is not an endothermic reaction [J & K 2005] |
| A. | Dehydrogenation |
| B. | Ethane to ethene |
| C. | Combustion of propane |
| D. | Change of chlorine molecule into chlorine atoms. |
| Answer» D. Change of chlorine molecule into chlorine atoms. | |
| 141. |
Which of the following has maximum boiling point [IIT-JEE 1986; MP PMT 1986; CPMT 1989] |
| A. | iso-octane |
| B. | n-octane |
| C. | 2, 2, 3, 3-tetramethyl butane |
| D. | n-butane |
| Answer» C. 2, 2, 3, 3-tetramethyl butane | |
| 142. |
Gasoline is obtained from crude petroleum oil by its [MP PMT 1999] |
| A. | Fractional distillation |
| B. | Vacuum distillation |
| C. | Steam distillation |
| D. | Pyrolysis |
| Answer» B. Vacuum distillation | |
| 143. |
Tetraethyl lead is used as [NCERT 1976, 79; DPMT 1984; CPMT 1989, 91; BHU 1995] |
| A. | Fire extinguisher |
| B. | Pain reliever |
| C. | Petroleum additive |
| D. | Mosquito repellent |
| Answer» E. | |
| 144. |
A reaction between methyl magnesium bromide and ethyl alcohol gives [CPMT 1979; MNR 1986; UPSEAT 1999] |
| A. | Methane |
| B. | Ethane |
| C. | Propane |
| D. | Butane |
| Answer» B. Ethane | |
| 145. |
Which gives \[C{{H}_{4}}\] when treated with water [CPMT 1974, 79; NCERT 1976; IIT-JEE 1990] |
| A. | Silicon carbide |
| B. | Calcium carbide |
| C. | Aluminium carbide |
| D. | Iron carbide |
| Answer» D. Iron carbide | |
| 146. |
Kerosene is used as fuel because it is [CPMT 1996] |
| A. | Less volatile |
| B. | More volatile |
| C. | Cheap |
| D. | Abundantly available |
| Answer» C. Cheap | |
| 147. |
The product obtained on reaction of \[{{C}_{2}}{{H}_{5}}Cl\] with hydrogen over palladium carbon is [AFMC 2005] |
| A. | \[{{C}_{3}}{{H}_{8}}\] |
| B. | \[{{C}_{4}}{{H}_{10}}\] |
| C. | \[{{C}_{2}}{{H}_{6}}\] |
| D. | \[{{C}_{2}}{{H}_{4}}\] |
| Answer» D. \[{{C}_{2}}{{H}_{4}}\] | |
| 148. |
Octane number can be changed by [AFMC 2004] |
| A. | Isomerisation |
| B. | Alkylation |
| C. | Cyclisation |
| D. | All of these |
| Answer» E. | |
| 149. |
Propane-1-ol can be prepared from propene by its reaction with [MP PMT 2003] |
| A. | \[C{{H}_{3}}COOH\] |
| B. | \[{{H}_{3}}B{{O}_{3}}\] |
| C. | \[{{B}_{2}}{{H}_{6}}/NaOH,{{H}_{2}}{{O}_{2}}\] |
| D. | \[{{H}_{2}}S{{O}_{4}}/{{H}_{2}}O\] |
| Answer» D. \[{{H}_{2}}S{{O}_{4}}/{{H}_{2}}O\] | |
| 150. |
C-H bond length is greatest in [IIT-JEE 1989; MNR 1990; AMU 2002] |
| A. | \[{{C}_{2}}{{H}_{2}}\] |
| B. | \[{{C}_{2}}{{H}_{4}}\] |
| C. | \[{{C}_{2}}{{H}_{6}}\] |
| D. | \[{{C}_{2}}{{H}_{2}}B{{r}_{2}}\] |
| Answer» D. \[{{C}_{2}}{{H}_{2}}B{{r}_{2}}\] | |