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MCQOPTIONS
This section includes 11242 Mcqs, each offering curated multiple-choice questions to sharpen your Joint Entrance Exam - Main (JEE Main) knowledge and support exam preparation. Choose a topic below to get started.
| 10701. |
Hydrogen has three isotopes, the number of possible diatomic molecules will be |
| A. | 2 |
| B. | 6 |
| C. | 9 |
| D. | 12 |
| Answer» C. 9 | |
| 10702. |
When \[S{{O}_{3}}\] is treated with heavy water the product is/are |
| A. | Deuterium and sulphuric acid |
| B. | Deuterium and sulphurous acid |
| C. | Only deuterium |
| D. | Dideuterosulphuric acid |
| Answer» E. | |
| 10703. |
The property of hydrogen which distinguishes it from alkali metals is |
| A. | Its electropositive character |
| B. | Its affinity for non-metal |
| C. | Its reducing character |
| D. | Its non-metallic character |
| Answer» E. | |
| 10704. |
The composition of tritium is [UGET Manipal 1995] |
| A. | 1 electron, 1 proton, 1 neutron |
| B. | 1 electron, 2 protons, 1 neutron |
| C. | 1 electron, 1 proton, 2 neutrons |
| D. | 1 electron, 1 proton, 3 neutrons |
| Answer» D. 1 electron, 1 proton, 3 neutrons | |
| 10705. |
Which is the lightest gas [CPMT 1993] |
| A. | Nitrogen |
| B. | Helium |
| C. | Oxygen |
| D. | Hydrogen |
| Answer» E. | |
| 10706. |
During free radical bromination of isobutene, an alkenei is produced as by product via disproportionation of the intermediate alkyl free radical. What is this alkene? |
| A. | 1-butene |
| B. | 2-butene |
| C. | 2-methyl propene |
| D. | Both [b] and [c] |
| Answer» D. Both [b] and [c] | |
| 10707. |
Arrange in order of decreasing trend towards electrophilic substitution reactions: Chlorobenzene (I), benzene (II), toluene (III), anilinium chloride (IV) |
| A. | III > II > I > IV |
| B. | IV > I > II > III |
| C. | II > I > IV > III |
| D. | I > II > IV > III |
| Answer» B. IV > I > II > III | |
| 10708. |
How is is widely used [MP PET 2002] |
| A. | Insecticide |
| B. | Drug |
| C. | Explosive |
| D. | Dye |
| Answer» D. Dye | |
| 10709. |
Iodoform can be used as [NCERT 1981] |
| A. | Anaesthetic |
| B. | Antiseptic |
| C. | Analgesic |
| D. | Antifebrin |
| Answer» C. Analgesic | |
| 10710. |
Which is used in the manufacture of plastic |
| A. | \[C{{H}_{2}}=CHCl\] |
| B. | \[CH\equiv CH\] |
| C. | \[C{{H}_{2}}=CH-C{{H}_{2}}I\] |
| D. | \[CC{{l}_{4}}\] |
| Answer» B. \[CH\equiv CH\] | |
| 10711. |
When ethyl iodide is heated with silver nitrate, the product obtained is [CPMT 2000] |
| A. | \[{{C}_{2}}{{H}_{5}}Ag\] |
| B. | \[Ag-O-N{{O}_{2}}\] |
| C. | \[{{C}_{2}}{{H}_{5}}O-N{{O}_{2}}\] |
| D. | \[{{C}_{2}}{{H}_{5}}I-N{{O}_{2}}\] |
| Answer» D. \[{{C}_{2}}{{H}_{5}}I-N{{O}_{2}}\] | |
| 10712. |
Iodoform on heating with \[KOH\]gives [MP PMT 2000] |
| A. | \[C{{H}_{3}}CHO\] |
| B. | \[C{{H}_{3}}COOK\] |
| C. | \[HCOOK\] |
| D. | \[HCHO\] |
| Answer» D. \[HCHO\] | |
| 10713. |
Reduction of acetyl chloride with \[{{H}_{2}}\] in presence of Pd gives [MP PMT 2001] |
| A. | \[C{{H}_{3}}COC{{H}_{3}}\] |
| B. | \[{{C}_{2}}{{H}_{5}}OH\] |
| C. | \[C{{H}_{3}}COOH\] |
| D. | \[C{{H}_{3}}CHO\] |
| Answer» E. | |
| 10714. |
In alkaline hydrolysis of a tertiary alkyl halide by aqueous alkali if concentration of alkali is doubled, then the reaction [MH CET 2002] |
| A. | Will be doubled |
| B. | Will be halved |
| C. | Will remain constant |
| D. | Can?t say |
| Answer» D. Can?t say | |
| 10715. |
Chloropicrin is [Kurukshetra CET 2002] |
| A. | Trichloro acetaldehyde |
| B. | Nitrochloroform |
| C. | 2, 4, 6-trinitro phenol |
| D. | None of these |
| Answer» C. 2, 4, 6-trinitro phenol | |
| 10716. |
Which isomer of cyclohexane hexachloride is a very strong insecticide [MP PET 2003] |
| A. | \[\alpha \] |
| B. | \[\beta \] |
| C. | \[\gamma \] |
| D. | \[\delta \] |
| Answer» D. \[\delta \] | |
| 10717. |
\[{{C}_{2}}{{H}_{5}}Cl+KCN\xrightarrow{{}}X\xrightarrow{\text{Hydrolysis}}Y.\] 'X' and 'Y' are [MP PET 1995] |
| A. | \[{{C}_{2}}{{H}_{6}}\] and \[{{C}_{2}}{{H}_{5}}CN\] |
| B. | \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}OH,\] and \[C{{H}_{3}}-CHOH-C{{H}_{3}}\] |
| C. | \[C{{H}_{3}}-C(C{{H}_{3}})(OH)-C{{H}_{3}}\] and \[{{C}_{2}}{{H}_{5}}C{{H}_{2}}N{{H}_{2}}\] |
| D. | \[{{C}_{2}}{{H}_{5}}CN\] and \[{{C}_{2}}{{H}_{5}}COOH\] |
| Answer» E. | |
| 10718. |
Which of the following statements is incorrect [CPMT 1977] |
| A. | \[{{C}_{2}}{{H}_{5}}Br\] reacts with alco. KOH to form \[{{C}_{2}}{{H}_{5}}OH\] |
| B. | \[{{C}_{2}}{{H}_{5}}Br\] when treated with metallic sodium gives ethane |
| C. | \[{{C}_{2}}{{H}_{5}}Br\] when treated with sodium ethoxide forms diethyl ether |
| D. | \[{{C}_{2}}{{H}_{5}}Br\] with AgCN forms ethyl isocyanide |
| Answer» B. \[{{C}_{2}}{{H}_{5}}Br\] when treated with metallic sodium gives ethane | |
| 10719. |
When ethyl amine is heated with chloroform and alcoholic KOH, a compound with offensive smell is obtained. This compound is [CPMT 1983, 84; RPMT 2002] |
| A. | A secondary amine |
| B. | An isocyanide |
| C. | A cyanide |
| D. | An acid |
| Answer» C. A cyanide | |
| 10720. |
\[CC{{l}_{4}}\] cannot give precipitate with \[AgN{{O}_{3}}\] due to [CPMT 1979] |
| A. | Formation of complex with \[AgN{{O}_{3}}\] |
| B. | Evolution of \[C{{l}_{2}}\] gas |
| C. | Chloride ion is not formed |
| D. | \[AgN{{O}_{3}}\] does not give silver ion |
| Answer» D. \[AgN{{O}_{3}}\] does not give silver ion | |
| 10721. |
Ethyl bromide can be converted into ethyl alcohol by [KCET 1989] |
| A. | Heating with dilute hydrochloric acid and zinc |
| B. | Boiling with an alcoholic solution of KOH |
| C. | The action of moist silver oxide |
| D. | Refluxing methanol |
| Answer» D. Refluxing methanol | |
| 10722. |
The bad smelling substance formed by the action of alcoholic caustic potash on chloroform and aniline is [MP PMT 1971, 92, 2001; CPMT 1971, 86; AFMC 2002; RPMT 1999] |
| A. | Phenyl isocyanide |
| B. | Nitrobenzene |
| C. | Phenyl cyanide |
| D. | Phenyl isocyanate |
| Answer» B. Nitrobenzene | |
| 10723. |
Carbylamine is liberated when..... is heated with chloroform and alcoholic potash [KCET 1992] |
| A. | An aldehyde |
| B. | A primary amine |
| C. | A secondary amine |
| D. | A phenol |
| Answer» C. A secondary amine | |
| 10724. |
Which of the following is liquid at room temperature [AFMC 2005] |
| A. | \[C{{H}_{3}}I\] |
| B. | \[C{{H}_{3}}Br\] |
| C. | \[{{C}_{2}}{{H}_{5}}Cl\] |
| D. | \[C{{H}_{3}}F\] |
| Answer» B. \[C{{H}_{3}}Br\] | |
| 10725. |
DDT is |
| A. | A solid |
| B. | A liquid |
| C. | A gas |
| D. | A solution |
| Answer» B. A liquid | |
| 10726. |
In Wurtz reaction alkyl halide react with [MH CET 2004] |
| A. | Sodium in ether |
| B. | Sodium in dry ether |
| C. | Sodium only |
| D. | Alkyl halide in ether |
| Answer» B. Sodium in dry ether | |
| 10727. |
At normal temperature iodoform is [MP PET 2004] |
| A. | Thick viscous liquid |
| B. | Gas |
| C. | Volatile liquid |
| D. | Solid |
| Answer» E. | |
| 10728. |
In which case formation of butane nitrile is possible [Orissa JEE 2004] |
| A. | \[{{C}_{3}}{{H}_{7}}Br+KCN\] |
| B. | \[{{C}_{4}}{{H}_{9}}Br+KCN\] |
| C. | \[{{C}_{3}}{{H}_{7}}OH+KCN\] |
| D. | \[{{C}_{4}}{{H}_{9}}OH+KCN\] |
| Answer» B. \[{{C}_{4}}{{H}_{9}}Br+KCN\] | |
| 10729. |
For a given alkyl group the densities of the halides follow the order [MP PMT 1997] |
| A. | \[RI<RBr<RCl\] |
| B. | \[RI<RCl<RBr\] |
| C. | \[RBr<RI<RCl\] |
| D. | \[RCl<RBr<RI\] |
| Answer» E. | |
| 10730. |
\[CHC{{l}_{3}}\] and HF lead to the formation of a compound of fluorine of molecular weight 70. The compound is [RPET 2000] |
| A. | Fluoroform |
| B. | Fluorine monoxide |
| C. | Fluorine dioxide |
| D. | Fluromethanol |
| Answer» B. Fluorine monoxide | |
| 10731. |
Which of the following organic compounds will give a mixture of 1-chlorobutane and 2-chlorobutane on chlorination [CPMT 2001] |
| A. | \[C{{H}_{3}}-\underset{C{{H}_{3}}\,\,\,\,\,\,\,}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{CH-CH}}\,}}\,=C{{H}_{2}}\] |
| B. | \[HC\equiv C-\overset{H\,\,}{\mathop{\overset{|\,\,\,\,\,\,}{\mathop{C=}}\,}}\,C{{H}_{2}}\] |
| C. | \[C{{H}_{2}}=CH-CH=C{{H}_{2}}\] |
| D. | \[C{{H}_{2}}=CH-C{{H}_{2}}-C{{H}_{3}}\] |
| Answer» C. \[C{{H}_{2}}=CH-CH=C{{H}_{2}}\] | |
| 10732. |
Which of the following compounds gives trichloromethane on distilling with bleaching powder [KCET 2004; EAMCET 1986] |
| A. | Methanal |
| B. | Phenol |
| C. | Ethanol |
| D. | Methanol |
| Answer» D. Methanol | |
| 10733. |
Ethyl benzoate reacts with \[PC{{l}_{5}}\]to give [KCET 2003] |
| A. | \[{{C}_{2}}{{H}_{5}}Cl+{{C}_{6}}{{H}_{5}}COCl+POC{{l}_{3}}+HCl\] |
| B. | \[{{C}_{2}}{{H}_{5}}Cl+{{C}_{6}}{{H}_{5}}COCl+POC{{l}_{3}}\] |
| C. | \[C{{H}_{3}}COCl+{{C}_{6}}{{H}_{5}}COCl+POC{{l}_{3}}\] |
| D. | \[{{C}_{2}}{{H}_{5}}Cl+{{C}_{6}}{{H}_{5}}COOH+POC{{l}_{3}}\] |
| Answer» C. \[C{{H}_{3}}COCl+{{C}_{6}}{{H}_{5}}COCl+POC{{l}_{3}}\] | |
| 10734. |
Acetone reacts with \[{{I}_{2}}\] in presence of \[NaOH\] to form [MP PMT 1992] |
| A. | \[{{C}_{2}}{{H}_{5}}I\] |
| B. | \[{{C}_{2}}{{H}_{4}}{{I}_{2}}\] |
| C. | \[CH{{I}_{3}}\] |
| D. | \[C{{H}_{3}}I\] |
| Answer» D. \[C{{H}_{3}}I\] | |
| 10735. |
Lucas reagent is [MP PMT 1996; MP PET 1992, 95; CPMT 1986, 89; AIIMS 1980; Kurukshetra CEE 2002] |
| A. | Concentrated \[HCl+\text{anhydrous }ZnC{{l}_{2}}\] |
| B. | Dilute \[HCl+\text{ hydrated }ZnC{{l}_{2}}\] |
| C. | Concentrated \[HN{{O}_{3}}+\text{ anhydrous }ZnC{{l}_{2}}\] |
| D. | Concentrated \[HCl+\text{ anhydrous }MgC{{l}_{2}}\] |
| Answer» B. Dilute \[HCl+\text{ hydrated }ZnC{{l}_{2}}\] | |
| 10736. |
Which one of the following processes does not occur during formation of \[CHC{{l}_{3}}\] from \[{{C}_{2}}{{H}_{5}}OH\] and bleaching powder [DPMT 1984] |
| A. | Hydrolysis |
| B. | Oxidation |
| C. | Reduction |
| D. | Chlorination |
| Answer» D. Chlorination | |
| 10737. |
The product of the following reaction : \[C{{H}_{2}}=CH-CC{{l}_{3}}+HBr\] [RPET 2000] |
| A. | \[C{{H}_{3}}-CH(Br)-CC{{l}_{3}}\] |
| B. | \[C{{H}_{2}}(Br)-C{{H}_{2}}-CC{{l}_{3}}\] |
| C. | \[BrC{{H}_{2}}-CHCl-CHC{{l}_{2}}\] |
| D. | \[C{{H}_{3}}-C{{H}_{2}}-CC{{l}_{3}}\] |
| Answer» C. \[BrC{{H}_{2}}-CHCl-CHC{{l}_{2}}\] | |
| 10738. |
The following reaction is known as \[{{C}_{2}}{{H}_{5}}OH+SOC{{l}_{2}}\xrightarrow{\text{Pyridine}}{{C}_{2}}{{H}_{5}}Cl+S{{O}_{2}}+HCl\] [AIIMS 2002] |
| A. | Kharasch effect |
| B. | Darzen's procedure |
| C. | Williamson's synthesis |
| D. | Hunsdiecker synthesis reaction |
| Answer» C. Williamson's synthesis | |
| 10739. |
Meso-tartaric acid is [BHU 2001] |
| A. | Optically inactive |
| B. | Optically active because of molecular symmetry |
| C. | Optically inactive due to external compensation |
| D. | Optically active because of asymmetric carbon atom |
| Answer» B. Optically active because of molecular symmetry | |
| 10740. |
Which of the following statements is not true about enantiomers [DCE 2001] |
| A. | They have same physical properties |
| B. | They have different biological properties |
| C. | They have same chemical properties towards chiral compounds |
| D. | None of these |
| Answer» B. They have different biological properties | |
| 10741. |
An organic compound \[^{1}C{{H}_{3}}{{-}^{2}}C{{H}_{2}}{{-}^{3}}C{{H}_{2}}{{-}^{4}}C{{H}_{2}}{{-}^{5}}C{{H}_{2}}{{-}^{6}}C{{H}_{2}}{{-}^{7}}C{{H}_{3}}\] To make it chiral compound the attack should be on which carbon atom [DCE 2001] |
| A. | 1 |
| B. | 3 |
| C. | 4 |
| D. | 7 |
| Answer» C. 4 | |
| 10742. |
Glucose has optical isomers [DCE 2001] |
| A. | 8 |
| B. | 12 |
| C. | 16 |
| D. | Cannot be predicted |
| Answer» D. Cannot be predicted | |
| 10743. |
What is the maximum number of open chain structures possible for \[{{C}_{4}}{{H}_{8}}\] [MP PET 2001] |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 1 |
| Answer» C. 4 | |
| 10744. |
Stereoisomers which are not the mirror images of one another are called [RPMT 2000] |
| A. | Enantiomers |
| B. | Mesomers |
| C. | Tautomers |
| D. | Diasteroisomers |
| Answer» E. | |
| 10745. |
Which of the following will show geometrical isomerism [CPMT 2001; BHU 2005] |
| A. | \[C{{H}_{3}}CH=CHC{{H}_{3}}\] |
| B. | \[{{(C{{H}_{3}})}_{2}}C=C\,{{(C{{H}_{3}})}_{2}}\] |
| C. | \[{{N}_{2}}O.FeS{{O}_{4}}\] |
| D. | \[C{{H}_{3}}-CH=C\,{{(C{{H}_{3}})}_{2}}\] |
| Answer» B. \[{{(C{{H}_{3}})}_{2}}C=C\,{{(C{{H}_{3}})}_{2}}\] | |
| 10746. |
Reason for geometrical isomerism by 2-butene is [CBSE PMT 2000] |
| A. | Chiral carbon |
| B. | Free rotation about single bond |
| C. | Free rotation about double bond |
| D. | Restricted rotation about double bond |
| Answer» E. | |
| 10747. |
Which of the following will not lose asymmetry on reduction with \[LiAl{{H}_{4}}\] [Roorkee 2000] |
| A. | \[HO{{H}_{2}}C\begin{matrix} \,\,\,CHO\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\ +C{{H}_{2}}C{{H}_{3}} \\ \,\,\,\,\,\,CH=C{{H}_{2}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\ \end{matrix}\] |
| B. | \[{{H}_{2}}C=HCO\,\,\,+\,\,\,\begin{matrix} \,\,\,\,C{{H}_{3}}\,\,\,\,\,\,\, \\ \,\,\,\,\,\,\,\,\,CHO \\ \,\,\,\,C{{H}_{2}}C{{H}_{3}} \\ \end{matrix}\] |
| C. | \[HO{{H}_{2}}C+\begin{matrix} C{{H}_{3}}\,\,\,\,\,\, \\ \,\,\,\,\,\,\,\,\,COOH \\ C\equiv CH\,\,\, \\ \end{matrix}\] |
| D. | \[{{H}_{3}}C+\begin{matrix} CHO\,\,\,\,\,\,\,\, \\ \,\,\,\,\,\,\,\,\,\,\,C\equiv N \\ C{{H}_{2}}N{{H}_{2}} \\ \end{matrix}\] |
| Answer» C. \[HO{{H}_{2}}C+\begin{matrix} C{{H}_{3}}\,\,\,\,\,\, \\ \,\,\,\,\,\,\,\,\,COOH \\ C\equiv CH\,\,\, \\ \end{matrix}\] | |
| 10748. |
Which compound is optically active [DCE 1999] |
| A. | 4-chloro, 1 hydroxy butane |
| B. | \[{{3}^{o}}\]-butyl alcohol |
| C. | Secondary butyl amine |
| D. | n-butyl alcohol |
| Answer» D. n-butyl alcohol | |
| 10749. |
Choose the pair of chain isomer [RPMT 2000] |
| A. | \[C{{H}_{3}}CHB{{r}_{2}}\] and \[C{{H}_{2}}BrC{{H}_{2}}Br\] |
| B. | 1-propanol and 2-propanol |
| C. | Neo-pentane and isopentane |
| D. | Diethyl ether and methyl-n-propyl ether |
| Answer» D. Diethyl ether and methyl-n-propyl ether | |
| 10750. |
Optical isomerism arises due to the presence of [RPMT 2000] |
| A. | An asymmetric carbon atom |
| B. | Centre of symmetry |
| C. | Axis of symmetry |
| D. | Plane of symmetry |
| Answer» B. Centre of symmetry | |