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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 851. |
The correct order of increasing bond length of C-H, C-O, C-C and C=C is-A. `C-H lt C-O lt O lt O C-C lt C=C`B. `C-H lt C = C lt C -O lt C-C`C. `C - C - lt C = C lt C - O lt C - H`D. `C - O lt C - H lt C - C lt C = C` |
| Answer» Correct Answer - B | |
| 852. |
Which compound has least `e^(-)` density in benzene ringA. B. C. D. |
| Answer» Correct Answer - C | |
| 853. |
The carbon atoms of benzene are:A. `sp^(3)`B. `sp^(2)`C. spD. `s^(3)p` |
| Answer» Correct Answer - B | |
| 854. |
Graphite is soft while diamond is hard becauseA. Graphite in powder formB. Diamond has `sp^(2)` hybridization but graphite has `sp^(3)` hybridizationC. Graphite is in planar form while diamond is in tetrahedral formD. Graphite is covalent and diamond is ionic |
| Answer» Correct Answer - C | |
| 855. |
The stability order of the following carbocartions is : A. `IIgtIVgtIIIgtI`B. `IVgtIIgtIIIgtI`C. `IIgtIIIgtIgtIV`D. `IgtIIIgtIIgtIV` |
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Answer» Correct Answer - C `{:("II",gt" ","III",gt" "," I",gt" ","IV"),(""darr,,""darr,," "darr,,""darr),("More",,"resonance",,"no resonance",,"anti-aromatic"),("resonating",, ,, ,, "carbocation" ),("structure",, ,, ,,):}` |
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| 856. |
In which pair second ions is more stable than first ? A. (i) and (ii)B. (ii) and (iii)C. (ii) and (iv)D. (iii) and (iv) |
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Answer» Correct Answer - B (i) and (ii) 2nd ion is aromaic . |
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| 857. |
Some pairs of ions are given below. In which pair, first ion is more stable than second ?A. `CH_(3)-overset(o+)CH-CH_(3) and CH_(3) -overset(o+)CH-OCH_(3)`B. `CH_(3)-CH_(2)-overset(o+)CH-CH_(3)and CH_(2)=CH-CH_(2)-overset(o+)CH_(2)`C. D. |
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Answer» Correct Answer - B `CH_(3)-CH_(2)-overset(o+)CH-CH_(3)gtCH_(2)=CH-CH_(2)-overset(o+)CH_(2)` `5 alpha`-Hstabilises `" " 2alpha`- H & -I of by hyper conjugation `" "` double bonds so less stable |
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| 858. |
Which of the following is/are aromatic species.A. B. C. D. |
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Answer» Correct Answer - A::B::C D is non aromatic due to tub shaped structure. |
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| 859. |
Which molecules is not showing resonance.A. B. C. D. |
| Answer» Correct Answer - A | |
| 860. |
In pyridine, Number of conjugated electrons areA. 6B. 8C. zeroD. 5 |
| Answer» Correct Answer - A | |
| 861. |
Consider the following compound: `underset(1)(C)H_(2)=underset(2)(C)H-underset(3)(C)H=underset(4)(C)H_(2)` carbon-carbon bond length between `C_(2)` and `C_(3)` will be-A. 1.54ÅB. 1.3ÅC. 1.21ÅD. less than 1.54 and greater than 1.33Å |
| Answer» Correct Answer - D | |
| 862. |
Resonance involves :A. Delocalization of `pi`-electrons along a conjugated system.B. Delocalization of lone pair along a conjugated system.C. Delocalization of negative charge along a conjugated system.D. All are correct. |
| Answer» Correct Answer - D | |
| 863. |
In which compound delocalization is not possible-A. 2-buteneB. 1,3-butadieneC. 1,3,5-hexatrieneD. Benzene |
| Answer» Correct Answer - A | |
| 864. |
In which of the following compounds delocalisation of electrons and shifting of electron in the same direction ?A. B. `CH_(3)-NH-NO_(2)`C. `CH_(2)=CH-CH=CH-NO_(2)`D. `H_(2)N-overset(H)overset(|)C=CH_(2)` |
| Answer» Correct Answer - B::C | |
| 865. |
Which of the following is/are correct :A. B. C. D. |
| Answer» Correct Answer - B::D | |
| 866. |
During delocalization, which statement is INCORRECT :A. Net charge remains sameB. Number of paired electrons ramains sameC. Number of unpaired electrons remain sameD. Energy of resonating structures always remains same |
| Answer» Correct Answer - D | |
| 867. |
Which of the following groups cannot participate in resonance with benzene :A. `-COOH`B. `COO^(Theta)`C. `-overset(o+)NH_(3)`D. `-COCl` |
| Answer» Correct Answer - C | |
| 868. |
Resonance structure of the molecule does not haveA. higher energy than their hybrid structure.B. identical arrangement of atoms.C. the same number of paired electrons.D. always equal contribution to the resonance hybrid. |
| Answer» Correct Answer - D | |
| 869. |
Resonance structure of a molecule cannot haveA. identical arrangement of atomsB. nearly the same energyC. the same number of unpaired electronsD. identical bonding |
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Answer» Correct Answer - D Resonance structure cannot have identical bonding because in writing resonance structures, we are only allowed to move electrons. Resonance structure can have nearly the same energy content provided thay are equilvalent. |
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| 870. |
Which molecule does not show resonanceA. `CO`B. `CO_(2)`C. `CO_(3)^(-2)`D. `NO_(3)^(-)` |
| Answer» Correct Answer - A,B | |
| 871. |
Which of the following gives the correct order of decreasing electron withdrawing effect?A. `-CN gt C_(6)H_(5)- gt NO_(2) gt F-`B. `-F gt -CN gt C_(6)H_(5)- gt -NO_(2)`C. `-NO_(2) gt - CNgt -F gt C_(6)H_(5)-`D. `C_(6)H_(5)- gt -F gt -CN gt -NO_(2)` |
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Answer» Correct Answer - C The `-I` effect of some of the substituent is as follows: `-NO_(2) gt -CN gt -COOH gt -F gt Cl gt Brgt -Igt C_(6)H_(5) -NO_(2)` exerts the maximum `-I` effect due to `+ve` formal charge on `N`. |
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| 872. |
Resonance structure of molecule does not haveA. Identical arrangement of atomsB. Nearly the same energy contentC. The same number of paired electronsD. Identical bonding |
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Answer» Correct Answer - D Resonance structure of molecule does not have identical bonding. |
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| 873. |
The most stable carbocation is:A. `CH_(3)^(+)`B. `CH_(3)CH_(2)^(+)`C. `(CH_(3))_(3)C^(+)`D. `(CH_(3))_(2)CH^(+)` |
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Answer» Correct Answer - C In comparison to `H` atoms, alkyl groups are electron releasing, i.e., they have `+I` effect. This implies that when an alkyl group is bonded to the positively charged `C` atom of a carbocation, it will shift electron density toward the positive charged `C` atom. Through electron release, alkyl groups attached to the positive `C` atom of a carbocation disperse (or delocalize) the positive charge.. In doing so, the attached alkyl groups acquire some amount of the positive charge and thus stabilize the carbocation. In the tert-butyl cation `(CH_(3))_(3)C^(+)`, three electron releasing methyl groups surround the central `C` atom and assist in delocalizing the positive charge. In the isopropyl cation, `(CH_(3))_(2)CH^(+)`, there are only two attached methyl group that can serve to delocalize the charge. In the ethyl cation, there is only one attached methyl group, and in the methyl cation, there is none at all. As a result, the delocalization of charge and the order of stability of the carbocations parallel the number of attached methyl groups: `(CH_(3))_(3)C^(+) gt (CH_(3))_(2)H^(+) gt CH_(3)CH_(2)^(+) gt CH_(3)^(+)` |
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| 874. |
Which of the following alkyl groups has the maximum `+I` effect?A. `(CH_(3))_(3)C-`B. `CH_(3)CH_(2)^(-)`C. `CH_(3)^(-)`D. `(CH_(3))_(2)CH-` |
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Answer» Correct Answer - A `H` atom has zero inductive effect. With respect to the `H` atom, the `+I` effect of some of substituent decrease in the following order: `underset("t-Butyl")((CH_(3))_(3))C- gtunderset("Isopropyl")((CH_(3))_(2))CH- gt underset("Ethyl")(CH_(3)CH_(2))- gtunderset("Methyl")(CH_(3)-D)- gt -H` |
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| 875. |
The IUPAC name of the compound having the formula is `{:(" "CH_(3)),(" |"),(H_(3)C-C-CH=CH_(2)),(" |"),(" "CH_(3)):}`A. 3, 3, 3-trimethyl-1-propeneB. 1, 1, 1-trimethyl-2-propeneC. 3, 3-dimethyl-1-buteneD. 2, 2-dimethyl -3-butene |
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Answer» Correct Answer - C `{:(" "CH_(3)),(" |"),(underset(4)(C)H_(3)-underset(3)(C)-underset(2)(C)H=underset(1)(C)H_(2)),(" |"),(" "underset("3,3-dimethyl-1-butene")(CH_(3))):}` |
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| 876. |
IUPAC name isA. 1,1-dimethyl-3-bromoethyl-5-chloropentaneB. 3-bromomethyl-1-chloro-5-methylhexaneC. 1-bromomethyl-1-chloroethyl-4-methylpentaneD. 4-bromomethyl-1-chloro-6-methylheptane |
| Answer» Correct Answer - B | |
| 877. |
The compound `C_(4)H_(10)O` can showA. MetamerismB. Functional isomerismC. Positional isomerismD. All types |
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Answer» Correct Answer - D Position isomers : `underset("Butan-1-ol")(CH_(3)-CH_(2)-CH_(2)-CH_(2)-OH)` and `{:(CH_(3)-CH_(2)-CH-CH_(3)),(" |"),(" "OH),(" Butane-2-ol"):}` Functional isomers : `underset("Butanol")(CH_(3)CH_(2)CH_(2)-CH_(2)-OH)` and `underset("Diethylether")(C_(2)H_(5)-O-C_(2)H_(5))` Metamers: `underset("Diethyl ether")(C_(2)H_(5)-O-C_(2)H_(5))` and `underset("Methyl propyl ether")(CH_(3)-O-C_(3)H_(7))` |
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| 878. |
Geometrical isomerism is shown byA. 2-buteneB. 2-butyneC. 2-butanolD. Butanal |
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Answer» Correct Answer - A `{:(HC=CH),("|"" |"),(CH_(3)" "CH_(3)),(" "(Cis)),(" 2-butene"):}` and `{:(" "CH_(3)),(" |"),(HC=CH),("|"),(""CH_(3)),(" (Trans)"),(" 2-butene"):}` |
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| 879. |
Which of the following orders is correct for the magnitude of +M power among these compounds? A. `ZgtYgtX`B. `YgtXgtZ`C. `XgtYgtZ`D. `ZgtYgtX` |
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Answer» Correct Answer - A N has low electronegativeity. |
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| 880. |
IUPAC name of the following compound `{:(H_(3)C-CH_(2)-CH-CH_(2)-CH-CH_(2)CH_(3)),(" |"" |"),(" "CH_(2)CH_(3)" "CH_(3)):}` isA. 3-ethyl-5-methylheptaneB. 5-ethyl-3-methylheptaneC. 3,5-diethylhexaneD. 1,1-diethyl-3-methylpentane |
| Answer» Correct Answer - A | |
| 881. |
Homolytic bond dissociation energy of `C-H` bond is minimum forA. `CH_(3)CH_(2)-H`B. `(CH_(3))_(2)-H`C. `(CH_(3))_(3)C-H`D. `C_(6)H_(5)CH_(2)-H` |
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Answer» Correct Answer - D Homolytic bonds dissociation energy of `C-H` bonds is inversly related to the stability of free radical formed. Thus, the more stable the radical, the lesser the bond disociation enrgy. Since the order of stability is `C_(6)H_(5)CH_(2)gt (CH_(3))_(3_ Cgt (CH_(3))_(2))CH gt CH_(3)CH_(2)` the order of bonds dissociation energy is as follows: `underset(410KJmol^(-))(C)H_(3)CH_(2)-Hunderset(395KJmol^(-1))((CH_(3))_(2))CH-H gt underset(381KJ mol^(-1))((CH_(3))_(3))-Hgt underset(356KJmol^(-1))(C_(6)H_(5)CH_(2)-H` |
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| 882. |
Which of the following orders is correct for heat of hydrogenation of thesee compounds :A. `IgtIIgtIII`B. `IIIgtIIgtI`C. `IIgtIIIgtI`D. `IIIgtIgtII` |
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Answer» Correct Answer - C Heat of hydrogenation `prop(1)/("stabilityof alkene")` |
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| 883. |
Give the IUPAC name of the alkene A. Z-3-methyl-4-propyl-3-octeneB. E-3-methyl-4-propyl-3-octeneC. E-4-butyl-3-methyl-3-hepteneD. E-2-ethyl-3-propyl-2-heptene |
| Answer» Correct Answer - A | |
| 884. |
in `C_(1)-H, C_(2)-H` and `C_(3)-H` the homolytic bond dissociation energy order is :A. `C_(2)-HgtC_(3)-HgtC_(1)-H`B. `C_(2)-HgtC_(3)-HgtC_(1)-H`C. `C_(2)-HgtC_(3)-HgtC_(1)-H`D. `C_(3)-HgtC_(2)-HgtC_(1)-H` |
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Answer» Correct Answer - D `"Dissociation energy" prop(1)/("stability of free radical")` |
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| 885. |
Find out correct order for the heat of hydrogenation of these compounds : A. `YgtXgtZ`B. `YgtZgtX`C. `XgtYgtZ`D. `ZgtXgtY` |
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Answer» Correct Answer - B Stability `prop(1)/(HOH)` |
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| 886. |
The stability order of alkene in following compounds is : A. `IltIIltIIIltIV`B. `IIltIltIIIltIV`C. `IIltIIIltIltIV`D. `IIltIVltIltIII` |
| Answer» Correct Answer - A | |
| 887. |
Select the correct statement (s):A. `CH_(3)Ooverset(o+)(C)H_(2)` is more stable than `CH_(3)overset(o+)(C)H_(2)`B. `Me_(2)overset(o+)(C)H` is more stable than `CH_(3)CH_(2)overset(o+)(C)H_(2)`C. `CH_(2)=CH-overset(o+)(C)H_(2)` is more stable than `CH_(3)CH_(2)overset(o+)(C)H_(2)`D. `CH_(2)=overset(o+)(C)H` is more stable than `CH_(3)overset(o+)(C)H_(2)` |
| Answer» Correct Answer - A::B::C | |
| 888. |
Which of the following statement is/are correct?A. Contributing structures contributes to the resonance hybrid in proportion of their energies.B.C. Equivalent contributing structure make the resonance very important.D. contributing structures represent hypothetical molecules having no real existance. |
| Answer» Correct Answer - B::C::D | |
| 889. |
Find out stability order of following compounds : A. `ZgtXgtY`B. `ZgtYgtX`C. `YgtZgtX`D. `XgtYgtZ` |
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Answer» Correct Answer - B X is least stabilise because of antiaromatic charater. |
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| 890. |
A canonical structure will be more stable ifA. it has more number of `pi` bonds than if it has less number of `pi` bondsB. the octets of all atoms are complete than if octets of all atoms are not completeC. it involves cyclic delocalization of `(4n+2)pi` electrons than if it involves acyclic delocalization of (4n) `pi` electronsD. `-ve` charge is on more electronegative atom than if -ve charge is on less electronegative atom. |
| Answer» Correct Answer - A::B::C::D | |
| 891. |
The correct stability order of the give canonical structure is :A. `XgtYgtZ`B. `ZgtXgtY`C. `XgtZgtY`D. `YgtZgtX` |
| Answer» Correct Answer - B | |
| 892. |
In the following canonical structures which is least stable structureA. IB. IIC. IIID. IV |
| Answer» Correct Answer - C | |
| 893. |
In the following canonical structures which is most stable structure.A. IB. IIC. IIID. IV |
| Answer» Correct Answer - A | |
| 894. |
There are three canonical structures of naphthalene. Examine them and find correct statement among the following : A. All C-C bonds are of same lengthB. `C_(1)-C_(2)` bond is shorter than `C_(2)-C_(3)` bondC. `C_(1)-C_(2)` bond is larger than `C_(2)-C_(3)` bondD. None of the above |
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Answer» Correct Answer - B `C_(1)-C_(2)` contain more (=) bond character than `C_(2)-C_(3)` |
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| 895. |
The correct order of stability for the given canonical structures is :A. `IgtIIIgtII`B. `IIIgtIgtII`C. `IIgtIIIgtI`D. `IIgtIgtIII` |
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Answer» Correct Answer - B Negative charge on oxygen is more stable than on carbon. |
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| 896. |
`CH_(2)=CH-underset((I))CH=CH-""^(o+)NH_(3),""^(o+)CH_(2)-CH=CH-""^(Ө)CH-""^(o+)NH_(3)""^(o+)CH_(2)-CH=underset((III))CH-CH=NH_(3)` Which of these structures is not a valid canonical structre?A. IB. IIC. IIID. none of these |
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Answer» Correct Answer - C Maximum co-valency of N is 4. |
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| 897. |
Which of the following has longest C-O bondA. B. C. D. |
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Answer» Correct Answer - B In a conjugate system resonance will take place and in a double bond, single bond character increases. |
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| 898. |
Inductive effect involveA. Delocalisation of `sigma`-electronsB. Partical displacement of `sigma`-electronsC. Delocalisation of `spi`-electronsD. Displacement of lone pair electrons. |
| Answer» Correct Answer - B | |
| 899. |
Base strength is in the order of `(i) CH_(3)barCH_(2)" "(ii) H_(2)C=overset(Ө)CH and " "(iii) H-C-=C^(Ө)`A. `(ii) gt (i) gt (iii)`B. `(iii) gt (ii) gt (i)`C. `(i) gt (iii) gt(ii)`D. `(i) gt (ii) gt (iii)` |
| Answer» Correct Answer - D | |
| 900. |
Which of the following alkenes have more value of heat of hydrogenation than A. B. C. D. |
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Answer» Correct Answer - B::C b and c have less no. of `prop-H` so they are less stable and high value of heat of hydrogenation. |
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