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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.
| 6601. |
Which one of the following is having zero dipole moment [RPMT 1997; EAMCET 1988; MNR 1991] |
| A. | \[CC{{l}_{4}}\] |
| B. | \[C{{H}_{3}}Cl\] |
| C. | \[C{{H}_{3}}F\] |
| D. | \[CHC{{l}_{3}}\] |
| Answer» B. \[C{{H}_{3}}Cl\] | |
| 6602. |
Which one has minimum (nearly zero) dipole moment [IIT Screening 1994; CBSE PMT 1996] |
| A. | Butene-1 |
| B. | cis butene-2 |
| C. | trans butene-2 |
| D. | 2-methyl-1-propene |
| Answer» D. 2-methyl-1-propene | |
| 6603. |
Which of the following is the most polar [AFMC 1988] |
| A. | \[CC{{l}_{4}}\] |
| B. | \[CHC{{l}_{3}}\] |
| C. | \[C{{H}_{3}}OH\] |
| D. | \[C{{H}_{3}}Cl\] |
| Answer» D. \[C{{H}_{3}}Cl\] | |
| 6604. |
Pick out the molecule which has zero dipole moment [CPMT 1989; EAMCET 1993; MP PMT 1999] |
| A. | \[N{{H}_{3}}\] |
| B. | \[{{H}_{2}}O\] |
| C. | \[BC{{l}_{3}}\] |
| D. | \[S{{O}_{2}}\] |
| Answer» D. \[S{{O}_{2}}\] | |
| 6605. |
The polarity of a covalent bond between two atoms depends upon [AMU 1982] |
| A. | Atomic size |
| B. | Electronegativity |
| C. | Ionic size |
| D. | None of the above |
| Answer» C. Ionic size | |
| 6606. |
Positive dipole moment is present in [MNR 1986; MP PET 2000] |
| A. | \[CC{{l}_{4}}\] |
| B. | \[{{C}_{6}}{{H}_{6}}\] |
| C. | \[B{{F}_{3}}\] |
| D. | \[HF\] |
| Answer» E. | |
| 6607. |
Carbon tetrachloride has no net dipole moment because of [IIT 1982, 83; MP PMT 1985, 91; EAMCET 1988; AMU 1999] |
| A. | Its planar structure |
| B. | Its regular tetrahedral structure |
| C. | Similar sizes of carbon and chlorine atoms |
| D. | Similar electron affinities of carbon and chlorine |
| Answer» C. Similar sizes of carbon and chlorine atoms | |
| 6608. |
The molecule which has the largest dipole moment amongst the following [MNR 1983] |
| A. | \[C{{H}_{4}}\] |
| B. | \[CHC{{l}_{3}}\] |
| C. | \[CC{{l}_{4}}\] |
| D. | \[CH{{I}_{3}}\] |
| Answer» C. \[CC{{l}_{4}}\] | |
| 6609. |
Aromatic properties of benzene are proved by [MP PMT 1994] |
| A. | Aromatic sextet theory |
| B. | Resonance theory |
| C. | Molecular orbital theory |
| D. | All of these |
| Answer» E. | |
| 6610. |
The dipole moment is the highest for [AIIMS 2004] |
| A. | Trans-2-butene |
| B. | 1, 3-Dimethylbenzene |
| C. | Acetophenone |
| D. | Ethanol |
| Answer» D. Ethanol | |
| 6611. |
Resonance structure of molecule does not have [IIT-JEE 1984] |
| A. | Identical arrangement of atoms |
| B. | Nearly the same energy content |
| C. | The same number of paired electrons |
| D. | Identical bonding |
| Answer» E. | |
| 6612. |
The presence of the chlorine atom on benzene ring makes the second substituent enter at a position [J & K 2005] |
| A. | ortho |
| B. | meta |
| C. | para |
| D. | ortholpara |
| Answer» E. | |
| 6613. |
Which of the following is an electrophile [J & K 2005] |
| A. | \[{{H}_{2}}O\] |
| B. | \[S{{O}_{3}}\] |
| C. | \[N{{H}_{3}}\] |
| D. | \[ROR\] |
| Answer» C. \[N{{H}_{3}}\] | |
| 6614. |
The reagent in Friedel Craft's reaction is [DPMT 2005] |
| A. | Pyridine |
| B. | \[RCOCl\] |
| C. | \[RCOOH\] |
| D. | \[HCl\] |
| Answer» C. \[RCOOH\] | |
| 6615. |
Which gives monosubstituted product [DPMT 2005] |
| A. | \[o\]-dinitrobenzene |
| B. | \[m\]-dinitrobenzene |
| C. | \[p\]-dinitrobenzene |
| D. | Nitrobenzene |
| Answer» C. \[p\]-dinitrobenzene | |
| 6616. |
A solution of D (+) - 2-chloro-2-phenylethane in toluene racemises slowly in the presence of small amount of \[SbC{{l}_{5}},\] due to the formation of [IIT-JEE 1999] |
| A. | Carbanion |
| B. | Carbene |
| C. | Free radical |
| D. | Carbocation |
| Answer» E. | |
| 6617. |
Which of the following intermediate have the complete octet around the carbon atom [Orissa JEE 2003] |
| A. | Carbonium ion |
| B. | Carbanion ion |
| C. | Free radical |
| D. | Carbene |
| Answer» C. Free radical | |
| 6618. |
C-C bond length in benzene is [MP PMT 1987; MP PMT 2001; AIIMS 2001] |
| A. | \[1.39\,\overset{\circ }{\mathop{\text{A}}}\,\] |
| B. | \[1.54\,\overset{\circ }{\mathop{\text{A}}}\,\] |
| C. | \[1.34\,\overset{\circ }{\mathop{\text{A}}}\,\] |
| D. | Different in different bonds |
| Answer» B. \[1.54\,\overset{\circ }{\mathop{\text{A}}}\,\] | |
| 6619. |
Heterolysis of carbon-chlorine bond produces [MNR 1986; MP PET/PMT 1998] |
| A. | Two free radicals |
| B. | Two carbonium ions |
| C. | Two carbanions |
| D. | One cation and one anion |
| Answer» E. | |
| 6620. |
In the compound given below The correct order of the acidity of the positions (X), (Y) and (Z) is [IIT-JEE Screening 2004] |
| A. | (Z) > (X) > (Y) |
| B. | (X) > (Y) > (Z) |
| C. | (X) > (Z) > (Y) |
| D. | (Y) > (X) > (Z) |
| Answer» C. (X) > (Z) > (Y) | |
| 6621. |
Among the given cations, the most stable carbonium ion is [IIT-JEE 1981] |
| A. | sec-butyl |
| B. | ter-butyl |
| C. | n-butyl |
| D. | None of these |
| Answer» C. n-butyl | |
| 6622. |
Which of the following carbanion is most stable [NCERT 1983] |
| A. | Methyl |
| B. | Primary |
| C. | Secondary |
| D. | Tertiary |
| Answer» B. Primary | |
| 6623. |
Which of the following free radicals is most stable [NCERT 1982] |
| A. | Primary |
| B. | Methyl |
| C. | Secondary |
| D. | Tertiary |
| Answer» E. | |
| 6624. |
Which of the following contains three pairs of electrons [BHU 1985] |
| A. | Carbocation |
| B. | Carbanion |
| C. | Free radical |
| D. | None of these |
| Answer» B. Carbanion | |
| 6625. |
Which of the following species is paramagnetic in nature [NCERT 1984] |
| A. | Free radical |
| B. | Carbonium ion |
| C. | Carbanion |
| D. | All the above |
| Answer» D. All the above | |
| 6626. |
Which of the following requires radical intermediate [Orissa JEE 2004] |
| A. | \[C{{H}_{3}}-CH=C{{H}_{2}}+HBr\to C{{H}_{3}}-\underset{Br\ }{\mathop{\underset{|}{\mathop{C}}\,H}}\,-C{{H}_{3}}\] |
| B. | \[C{{H}_{3}}-CHO+HCN\to C{{H}_{3}}-CH<\begin{matrix} CN \\ OH \\ \end{matrix}\] |
| C. | \[C{{H}_{3}}-CH=C{{H}_{2}}+HBr\to C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}-Br\] |
| D. | \[C{{H}_{3}}CHO+N{{H}_{2}}OH\xrightarrow{{{H}^{+}}}C{{H}_{3}}-CH=N-OH\] |
| Answer» D. \[C{{H}_{3}}CHO+N{{H}_{2}}OH\xrightarrow{{{H}^{+}}}C{{H}_{3}}-CH=N-OH\] | |
| 6627. |
Which compound shows dipole moment [RPMT 2002] |
| A. | 1,4-di-chloro benzene |
| B. | 1, 2-di-chloro benzene |
| C. | Trans-1, 2-di-chloro ethene |
| D. | Trans-2-butene |
| Answer» C. Trans-1, 2-di-chloro ethene | |
| 6628. |
Choose the chain terminating step (1) \[{{H}_{2}}\to {{H}^{\bullet }}+{{H}^{\bullet }}\] (2) \[B{{r}_{2}}\to B{{r}^{\bullet }}+B{{r}^{\bullet }}\] (3) \[B{{r}^{\bullet }}+HBr\to {{H}^{\bullet }}+B{{r}_{2}}\] (4) \[{{H}^{\bullet }}+B{{r}_{2}}\to HBr+B{{r}^{\bullet }}\] (5) \[B{{r}^{\bullet }}+B{{r}^{\bullet }}\to B{{r}_{2}}\] [RPET 2000] |
| A. | 1 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» E. | |
| 6629. |
The order of decreasing stability of the carbanions (1) \[{{(C{{H}_{3}})}_{3}}\bar{\ddot{C}}\] (2) \[{{(C{{H}_{3}})}_{2}}\bar{\ddot{C}}H\] (3) \[C{{H}_{3}}\bar{\ddot{C}}{{H}_{2}}\] (4) \[{{C}_{6}}{{H}_{5}}\bar{\ddot{C}}{{H}_{2}}\] is [KCET 1996] |
| A. | 1 > 2 > 3 > 4 |
| B. | 4 > 3 > 2 > 1 |
| C. | 4 > 1 > 2 > 3 |
| D. | 1 > 2 > 4 > 3 |
| Answer» C. 4 > 1 > 2 > 3 | |
| 6630. |
Which amongst the following is the most stable carbocation [CBSE PMT 2005] |
| A. | \[C{{H}_{3}}-\underset{C{{H}_{3}}}{\mathop{\underset{|}{\overset{+}{\mathop{C}}}\,\ \ \ \ }}\,\] |
| B. | \[C{{H}_{3}}-\underset{C{{H}_{3}}}{\overset{C{{H}_{3}}}{\mathop{\underset{|\ \ }{\overset{|\ \ }{\mathop{{{C}^{+}}}}}\,\ \ }}}\,\] |
| C. | \[\overset{+}{\mathop{C}}\,{{H}_{3}}\] |
| D. | \[C{{H}_{3}}\overset{+}{\mathop{C}}\,{{H}_{3}}\] |
| Answer» C. \[\overset{+}{\mathop{C}}\,{{H}_{3}}\] | |
| 6631. |
Reactivity towards nucleophilic addition reaction of (I) HCHO, (II) \[C{{H}_{3}}CHO\], (III) \[C{{H}_{3}}COC{{H}_{3}}\] is [Orissa JEE 2004] |
| A. | II > III > I |
| B. | III > II > I |
| C. | I > II > III |
| D. | I > II < III |
| Answer» D. I > II < III | |
| 6632. |
Orbital interaction between the sigma bonds of a substitutent group and a neighbouring pi orbital is known as [Kerala PMT 2004] |
| A. | Hyperconjugation |
| B. | Inductive effect |
| C. | Steric effect |
| D. | Dipole-dipole interactions |
| E. | Electric quadruple interactions |
| Answer» B. Inductive effect | |
| 6633. |
Cyclopentadienyl anion is [Orissa JEE 2003] |
| A. | Aromatic |
| B. | Non-aromatic |
| C. | Non-planar |
| D. | Aliphatic |
| Answer» B. Non-aromatic | |
| 6634. |
Dipole moment is shown by [DCE 1999] |
| A. | 1, 4-dichloro benzene |
| B. | Cis-1, 2-dichloro ethane |
| C. | Trans-1, 2-dichloro, 2-pentene |
| D. | Trans-1, 2-dichloro ether |
| Answer» C. Trans-1, 2-dichloro, 2-pentene | |
| 6635. |
Arrangement of \[{{(C{{H}_{3}})}_{3}}-C-{{(C{{H}_{2}})}_{3}}-CH-C{{H}_{3}}-C{{H}_{2}}-C{{H}_{3}}\] when attached to benzyl or an unsaturated group in increasing order of inductive effect is [AIEEE 2002] |
| A. | \[{{(C{{H}_{3}})}_{3}}-C-<{{(C{{H}_{3}})}_{2}}-CH-<C{{H}_{3}}-C{{H}_{2}}-\] |
| B. | \[C{{H}_{3}}-C{{H}_{2}}-<{{(C{{H}_{3}})}_{2}}-CH-<{{(C{{H}_{3}})}_{3}}-C-\] |
| C. | \[{{(C{{H}_{3}})}_{2}}-CH-<{{(C{{H}_{3}})}_{3}}-C-<C{{H}_{3}}-C{{H}_{2}}-\] |
| D. | \[{{(C{{H}_{2}})}_{3}}-C-<C{{H}_{3}}-C{{H}_{2}}-<{{(C{{H}_{3}})}_{2}}-CH-\] |
| Answer» C. \[{{(C{{H}_{3}})}_{2}}-CH-<{{(C{{H}_{3}})}_{3}}-C-<C{{H}_{3}}-C{{H}_{2}}-\] | |
| 6636. |
Which of the following are not aromatic [DCE 2001] |
| A. | Benzene |
| B. | Cyclo-octatetrarenyl dianion |
| C. | Tropyllium cation |
| D. | Cyclopentadienyl cation |
| Answer» E. | |
| 6637. |
In the mixture of conc. \[{{H}_{2}}S{{O}_{4}}\] and \[HN{{O}_{3}}\]the nitrating species is [MP PMT 2000] |
| A. | \[{{N}_{2}}{{O}_{4}}\] |
| B. | \[NO_{2}^{+}\] |
| C. | \[N{{O}_{2}}\] |
| D. | \[NO_{2}^{-}\] |
| Answer» C. \[N{{O}_{2}}\] | |
| 6638. |
Polarisation of electrons in acroline may be written as [DCE 2000] |
| A. | \[CH_{2}^{\delta -}=CH-C{{H}^{\delta +}}=O\] |
| B. | \[CH_{2}^{\delta -}=CH-CH={{O}^{\delta +}}\] |
| C. | \[CH_{2}^{\delta -}=C{{H}^{\delta +}}-CH=O\] |
| D. | \[CH_{2}^{\delta +}=CH-CH={{O}^{\delta -}}\] |
| Answer» E. | |
| 6639. |
\['C-C'\] bond length in benzene lies between single and double bond. The reason is [RPET 1999] |
| A. | Resonance |
| B. | Isomerism |
| C. | Metamerism |
| D. | Inductive effect |
| Answer» B. Isomerism | |
| 6640. |
Carboxylic acids are easily ionised. The main reason of this statement [UPSEAT 1999] |
| A. | Absence of a-hydrogen |
| B. | Resonance stabilisation of carboxylate ion |
| C. | Reactivity of a-hydrogen |
| D. | Hydrogen bond |
| Answer» C. Reactivity of a-hydrogen | |
| 6641. |
Benzene is unreactive because [KCET 1998] |
| A. | It has double bonds |
| B. | It has carbon-carbon single bond |
| C. | Carbon are \[s{{p}^{2}}\] hybridised |
| D. | \[\pi \] electrons are delocalised |
| Answer» E. | |
| 6642. |
Which one of the following orders is correct regarding the inductive effect of the substituents [CBSE PMT 1998] |
| A. | \[-N{{R}_{2}}<-OR>-F\] |
| B. | \[-N{{R}_{2}}>-OR>-F\] |
| C. | \[-N{{R}_{2}}<-OR<-F\] |
| D. | \[-N{{R}_{2}}>-OR<-F\] |
| Answer» D. \[-N{{R}_{2}}>-OR<-F\] | |
| 6643. |
Which has zero dipole moment [NCERT 1990; BHU 2001] |
| A. | cis-2-butene |
| B. | trans-2-butene |
| C. | 1-butene |
| D. | 2-methyl-1-propene |
| Answer» C. 1-butene | |
| 6644. |
1% solution of \[Ca{{(N{{O}_{3}})}_{2}}\] has freezing point [DPMT 1982, 83; CPMT 1977] |
| A. | \[{{0}^{o}}C\] |
| B. | Less than \[{{0}^{o}}C\] |
| C. | Greater than \[{{0}^{o}}C\] |
| D. | None of the above |
| Answer» C. Greater than \[{{0}^{o}}C\] | |
| 6645. |
If \[{{K}_{f}}\] value of \[{{H}_{2}}O\] is 1.86. The value of \[\Delta {{T}_{f}}\] for \[0.1m\] solution of non-volatile solute is |
| A. | 18.6 |
| B. | 0.186 |
| C. | 1.86 |
| D. | 0.0186 |
| Answer» C. 1.86 | |
| 6646. |
What is the freezing point of a solution containing \[8.1\,g\,HBr\] in \[100g\] water assuming the acid to be 90% ionised \[({{K}_{f}}\] for water \[=1.86\,K\,mol{{e}^{-1}})\] [BHU 1981; Pb CET 2004] |
| A. | \[{{0.85}^{o}}C\] |
| B. | \[-{{3.53}^{o}}C\] |
| C. | \[{{0}^{o}}C\] |
| D. | \[-{{0.35}^{o}}C\] |
| Answer» C. \[{{0}^{o}}C\] | |
| 6647. |
The freezing point of a solution prepared from \[1.25\,gm\] of a non-electrolyte and \[20\,gm\] of water is \[271.9\,K\]. If molar depression constant is \[1.86K\,mol{{e}^{-1}}\], then molar mass of the solute will be [AFMC 1998; CPMT 1999] |
| A. | 105.7 |
| B. | 106.7 |
| C. | 115.3 |
| D. | 93.9 |
| Answer» B. 106.7 | |
| 6648. |
Solute when dissolved in water [MADT Bihar 1981] |
| A. | Increases the vapour pressure of water |
| B. | Decreases the boiling point of water |
| C. | Decreases the freezing point of water |
| D. | All of the above |
| Answer» D. All of the above | |
| 6649. |
Which one of the following statements is FALSE [AIEEE 2004] |
| A. | The correct order of osmotic pressure for 0.01 M aqueous solution of each compound is \[BaC{{l}_{2}}>KCl>C{{H}_{3}}COOH>\] sucrose. |
| B. | The osmotic pressure \[(\pi )\] of a solution is given by the equation \[\pi =MRT\] where M is the molarity of the solution. |
| C. | Raoult's law states that the vapour pressure of a component over a solution is proportional to its mole fraction. |
| D. | Two sucrose solutions of same molality prepared in different solvents will have the same freezing point depression. |
| Answer» E. | |
| 6650. |
The maximum freezing point falls in [MP PMT 1986] |
| A. | Camphor |
| B. | Naphthalene |
| C. | Benzene |
| D. | Water |
| Answer» B. Naphthalene | |