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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.
| 751. |
The decreasing basic character of the following is : (I) `Ph O^(Ө)` (II) `CH_3 S^(Ө)` (III) `overset (Ө) O H` (IV) `MeO^(Ө)`.A. `I gt II gt III gt IV`B. `III gt IV gt II gt I`C. `IV gt III gt II gt I`D. `I gt II gt IV gt III` |
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Answer» Correct Answer - B (b) Acidity : `PhOH gt CH_3 SH gt MeOH gt H_2 O` Basicity : `PhOH^(Ө) lt CH_3 S^(Ө) lt MeO^(Ө) lt overset (oplus) O H` (Hence the answer is `b`) |
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| 752. |
The decreasing nucleophilicity of the following is : (I) `CH_3 S^(Ө)` (II) `CH_3 O^(Ө)` (III) `overset (Ө) O H` (IV) `EtO^(Ө)`.A. `IV gt III gt II gt I`B. `I gt II gt III gt IV`C. `IV gt III gt I gt II`D. `II gt I gt III gt IV` |
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Answer» Correct Answer - C ( c) Acidity as explained in (a) is : `CH_2SH gt CH_3 OH gt H_2 O gt EtOH` Basicity : `CH_3 S^(Ө) lt CH_3 overset (Ө) O lt overset (Ө) O H lt Et overset (Ө)` When nucleophilic centre is different `(CH_3 S^(Ө)` and `CH_3 overset (Ө) O`) and they belong to the same group, nucleophilecity antiparallels basicity. `:.` nucleophilicity : `Et overset (Ө) O gt overset (Ө) O H gt CH_3 overset (Ө) S gt CH_3 overset (Ө) O`, so the answer is `c`. |
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| 753. |
Which of the folowing can exist in enatimeric forms?A. `CH_(3)-CH(CH_(3))-COOH`B. `CH_(3)-CH=CH-CH_(2)-CH_(3)`C. `CH_(3)-CH(NH_(2))-CH_(3)`D. `CH_(3)-CH_(2)-CH(OH)-CH_(3)` |
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Answer» Correct Answer - 4 `XH_(3)- overset(**)CH(OH)-CH_(2)-CH_(3)` |
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| 754. |
The number of optical actgive isomers of 2,4 dibromobutane areA. 3B. 2C. 4D. 1 |
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Answer» Correct Answer - 2 `CH_(3)-ovrerset(**)CH Br-overset(**)Br-CH_(3)` has two similarchiral carbons No. of optically active isomers `=2^(N-1)` |
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| 755. |
Tautomerism is not exhibited by :A. B. C. D. |
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Answer» Correct Answer - A Compound (A) donot have acidic hydrogen |
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| 756. |
Compare the acidities of amide `(R-underset(O)underset(||)(C)-NH_(2))` and sulphonamide `(R-underset(O)underset(||)overset(O)overset(|)S-NH_(2))` |
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Answer» The conjugate base of sulphonamide is stabilised by the delocalisation of the negative charge to two `O` atoms, whereas in amide the delocalisation in possible to only one `O` atom Hence, sulphonamides are more acidic than amides. `R-underset(O)underset(||)overset(O)overset(||)S-ddotNH_(2)hArr [R-overset(O)overset(||)underset(O)underset(||)S-underset(..)overset(ddotTheta)NHharr R-overset(O^(Theta))overset(|)underset(O)underset(||)S=ddotNH harrR-underset(O_(Theta))underset(|)overset(O)overset(||)S=ddotNH]` |
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| 757. |
Tautomerism is exhibited by.A. B. C. D. |
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Answer» Correct Answer - A,D Compound A,D have acidic hydrogen |
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| 758. |
Which of the following is the weakest acid?A. `(CH_(3))_(3)C COOH`B. `CH_(3)COOH`C. `CH_(3)CH_(2)COOH`D. `(CH_(3))_(2)CHCOOH` |
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Answer» Correct Answer - A The acidic strength of a carboxylic acid decreases due to the presence of an electron releasing substituent because the substituents destabilize the carboxylate ion by intensifying its negative charge. Thus, the more the number of electron releasing alkyl groups, the weaker the acid would be, As a result, trimethylacetic acid having maximum number of electron releasing methyl groups is the weakest acid. |
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| 759. |
Rank the following alkenes according to energy (1=lowest energy). |
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Answer» Correct Answer - A-1; B-4; C-3; D-2 `Stability order of alkene `alpah` no. fo `alpha` hydrogens. Ato9alpha-H" " Bto1alpha-H" " Cto3alpha-H" " Dto5alpha-H`` |
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| 760. |
Match the column : |
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Answer» Correct Answer - a-r; b-t; c-t; d-s D.B.E=Number of (`pi` bonds +Rings) |
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| 761. |
Find out the double bond equivalent IDEB) value of the given folloiwng compound : |
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Answer» Correct Answer - 11 D.B.E. =Number of `pi` bonds + rings |
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| 762. |
How many isomers of `C_(4)H_(10)O` reacts with Na metal to evolve `H_(2)` gas ? (excluding sterreoismer ) |
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Answer» Correct Answer - 4 `C-C-C-C-OH " " (b) C-C-C-underset(OH)underset(|)C-C" " (c) C-overset(C)overset(|)C-C-OH " " (d) C-underset(OH)underset(|)overset(C)overset(|)C-C` |
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| 763. |
Total number of DEB value in : |
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Answer» Correct Answer - 13 No. of `pi` bonds =9 No. of rins =4 |
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| 764. |
The structure of N-Ethyl-N-phenyl-butanamide isA. B. C. D. |
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Answer» Correct Answer - B |
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| 765. |
, IUPAC name of the compoundA. 4-bromo-3- cyano phenolB. 2-bromo-5-hydroxybenzonitrileC. 2-cyano-4-hydroxy bromobenzeneD. 6-bromo-3-hydroxy benzo nitrile |
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Answer» Correct Answer - B |
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| 766. |
What type of isomers are the following pairs? A. ConformersB. positionC. OpticalD. Geometrical |
| Answer» Correct Answer - A | |
| 767. |
Most stable form of cyclohexane isA. boatB. chairC. skewD. eclipsed |
| Answer» Correct Answer - B | |
| 768. |
The dihedral angle between two adjacent axial hydrogens in the most stable cyclohexane at r.t.A. `180^(@)`B. `120^(@)`C. `60^(@)`D. `0^(@)` |
| Answer» Correct Answer - D | |
| 769. |
The optical rtation of an optically active compound isA. Directly proportional to length of the polarimeter tube onlyB. Directly proportional to the molar concentration of the compoundC. Independent of the length of the polarimeter tube and concentration of the compoundD. Directly proportional to both the length of the polarimeter tube and molar concentration of the compound |
| Answer» Correct Answer - C | |
| 770. |
The IUPAC name of the given structure A. Bicyclo [3, 2, 1] octaneB. Bicyclo [3, 2, 2] octaneC. Spiro [3, 2, 1] octaneD. Bicyclo [5, 2, 1] octane |
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Answer» Correct Answer - A |
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| 771. |
The correct relation between the following pair of compounds is A. Constitutional isomersB. EnantiomersC. DiastereomersD. None of these |
| Answer» Correct Answer - D | |
| 772. |
The IUPAC name of the given structure A. 3,3-DimethylpentaneB. 3,3-DiethylpentaneC. 3-Ethyl-3-methylpentaneD. 3-Ethyl-3-ethylpentane |
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Answer» Correct Answer - B |
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| 773. |
Glucose has optical isomersA. 8B. 12C. 16D. Cannot be predicted |
| Answer» Correct Answer - C | |
| 774. |
The `IUPAC` name of acraldehyde isA. 2 - PropenalB. Propenyl aldehydeC. 2-ButenalD. Propenal |
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Answer» Correct Answer - A |
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| 775. |
Among the three conformations of ethane, the order of stability follows the sequenceA. Eclipsed `gt` gauche `gt` staggeredB. Eclipsed `gt` staggered `gt` gaucheC. Staggered `gt` gauche `gt` eclipsedD. Gauche `gt` staggered `gt` eclipsed |
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Answer» Correct Answer - C The eclipsed conformation is least stable because the hydrogen and bonding pairs of electrons on adjacent carbon atoms are as close to one another as possible. This causes maximum repulsion and least stability. Staggered conformation is most stable because of minimum repulsion. Gauche conformation lie between these two in stability. Thus, order of stability is Staggered `gt` gauche `gt` eclipsed |
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| 776. |
An organic compound `.^(1)CH_(3)-^(2)CH_(3)-^(3)CH_(3)-^(4)CH_(2)-^(5)CH_(2)-^(6)CH_(2)-^(7)CH_(3)` To make it chiral compound the attack should be on which carbon atomA. 1B. 3C. 4D. 7 |
| Answer» Correct Answer - B | |
| 777. |
Which of the following hydride is capable of showing conformationsA. `NH_(2) - NH_(2)`B. `B_(2)H_(6)`C. `CH_(4)`D. None of these |
| Answer» Correct Answer - A | |
| 778. |
Which nomenclature is not according to IUPAC systemA. `Br-CH_(2)-CH=CH_(2)`, 1-Bromo-prop-2-eneB. `{:(" "CH_(3)),(" |"),(CH_(3)-CH_(2)-C-CH_(2)-CHCH_(3)","),(" |"" |"),(" "Br" "CH_(3)),("4 - Bromo, 2, 4-di-methylhexane"):}`C. D. `{:(CH_(3)-C-CH_(2)-CH_(2)-CH_(2)COOH),(" ||"),(" "O),("5-Oxohexanoic acid"):}` |
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Answer» Correct Answer - A `Br-underset(3)(C)H_(2)-underset(2)(C)H = underset(1)(C)H_(2)`. the correct name is 3-Bromoprop-1-ene. |
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| 779. |
The `IUPAC` name of acraldehyde isA. Prop-2-ene-1-alB. Propenyl aldehydeC. But-2-ene-1-alD. Propenal |
| Answer» Correct Answer - A | |
| 780. |
Which nomenclature is not according to IUPAC systemA. `Br-CH_(2)-CH=CH_(2)`, 1-Bromo-prop-2-eneB. `{:(" "CH_(3)),(" |"),(CH_(3)-CH_(2)-C-CH_(2)-CHCH_(3)","),(" |"" |"),(" "Br" "CH_(3)),("4 - Bromo, 2, 4-di-methylhexane"):}`C. D. `{:(CH_(3)-C-CH_(2)-CH_(2)-CH_(2)COOH),(" ||"),(" "O),("5-Oxohexanoic acid"):}` |
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Answer» Correct Answer - A `Br-underset(3)(C)H_(2)-underset(2)(C)H = underset(1)(C)H_(2)`. the correct name is 3-Bromoprop-1-ene. |
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| 781. |
Given I and II areA. IdenticalB. A pair of conformersC. A pair of geometrical isomersD. A pair of optical isomers |
| Answer» Correct Answer - B | |
| 782. |
The number of tetirary carbon atoms in the compound `(CH_(3))_(2)CHCH_(2)C(CH_(3))_(3)` isA. 2B. 3C. 1D. 4 |
| Answer» Correct Answer - C | |
| 783. |
Restricted rotation is present inA. EthaneB. EtheneC. AlcoholD. Propyne |
| Answer» Correct Answer - B | |
| 784. |
The name of `{:(H_(3)C-CH-CH-CH_(3)),(" |"" |"),(" "CH_(3)" "OH):}` in IUPAC nomenclature system isA. ButanolB. 2-methyl butanol-3C. 3-methyl butanol-2D. Pentanol |
| Answer» Correct Answer - C | |
| 785. |
The IUPAC name for the formula `{:(" "H),(" |"),(CH_(3)-C=C-COOH),(" |"),(" "CH_(3)):}`A. 2-methyl-2-butanoic acidB. 3-methyl-3-butenoic acidC. 3-methyl-2-butenoic acidD. 2-methyl-3-butenoic acid |
| Answer» Correct Answer - C | |
| 786. |
The IUPAC name of `CH_(3)CHO` is :A. AcetaldehydeB. Methyl aldehydeC. EthanolD. Ethanal |
| Answer» Correct Answer - D | |
| 787. |
The IUPAC name of the molecule `{:(" "O" "O),(" ||"" ||"),(CH_(3)-C-C=""C-C-OH),(" |"" |"),(" "H_(3)C" "CH_(3)):}` isA. 4-oxo-2, 3-dimethylpent-2-ene-1 oic acidB. 2-carboxy-3-methylpent-2-en-2-oneC. 4-carboxy-3-methylpent-3-en-2-oneD. 2, 3-dimethyl-4-oxo-pent-2-en-1-oic acid |
| Answer» Correct Answer - A | |
| 788. |
The IUPAc name of the compound `CHO-(CH_(2))_(4)-COOH`A. Hexan-1-al-6-oic acidB. 6-formyl-hexanoic acidC. Hexanal-1-carboxylic acidD. Hexanoic acid 5-al-1 |
| Answer» Correct Answer - B | |
| 789. |
Which of the following statement is/are correct ?A. 3,3-Dimethyl-4-cyanophenol (I) is more acidic than the isomeric 2,6-dimethyl-4-cyanophenol (II) .B. `(II)` is more acidic than `(I)`C. `(I)` is more acidic than `(II)` due to no steric inhibition of the two `Me` groups with `(CN)` groups, since `(-CN)` group is linear.D. Acidic character of `(I)` and `(II)` is determines by `+ I` effect of twp `Me` groups in `(I)` and `+I` and `H.C` effects of two `Me` groups in `(II)` |
| Answer» Correct Answer - A::C::D | |
| 790. |
Which of the following statemenet (s) is/are correct ?A. `3,5-`Dimethy1-4-nitrophenol (I) is less acidic than the isomeric `2,6-`demthy-4-nitrophenol (II) .B. `(I)` is more acidic than `(II)`C. `I` is less acidic than `(II)` due to steric inhibition of resonance of two `(Me)` groups with `(NO_2)` group.D. `(I)` is more acidic than `(II)` due to less `+ I` effect of two `(Me)` groups in `(I)` |
| Answer» Correct Answer - A::C | |
| 791. |
The total number of `pi`-bond electrons in the following structure is A. 8B. 12C. 16D. 4 |
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Answer» Correct Answer - A `pi` bond electrons = no. of double bond `xx 2 = 4 xx 2 = 8pi` electrons |
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| 792. |
The enolic form of ethyl acetoacetate as below has A. 16 sigma bonds and 1 pi-bondB. 9 sigma bonds and 2 pi-bondC. 9 sigma bonds and 1 pi-bondD. 18 sigma bonds and 2 pi-bond |
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Answer» Correct Answer - D `18 sigma` and `2pi` bonds in both keto and enol form of ethyl acetoacetate |
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| 793. |
Arrange the following in the order of increasing stability: `PhC^(+)H_(2) , Ph_(3)C^(+), Me^(+), Ph_(2)C^(+)H`A. `Me^(+) lt PhC^(+)He lt Ph_(2)C^(+)H lt Ph_(3)C^(+)`B. `PhC^(+)H_(2) lt Me^(+) lt Ph_(3)C^(+) lt Ph_(2)C^(+)H`C. `PhC^(+)H_(2) lt Ph_(3)C^(+) lt Me^(+) lt Ph_(2)C^(+)H`D. `PhC^(+)H_(2) lt Ph_(2)C^(+)H lt Ph_(3)C^(+) lt Me^(+)` |
| Answer» Correct Answer - A | |
| 794. |
Which of the following order is expected to be correct ?A. `pK_(a)(ClCH_(2)COOH) gt pK_(a)(CH_(3)COOH) lt pK_(a) (CH_(3)CH_(2)COOH)`B. `pK_(a)(ClCH_(2)COOH) lt pK_(a)(CH_(3)COOH) lt pK_(a) (CH_(3)CH_(2)COOH)`C. `pK_(a)(ClCH_(2)COOH) gt pK_(a)(CH_(3)COOH) gt pK_(a) (CH_(3)CH_(2)COOH)`D. `pK_(a)(ClCH_(2)COOH) lt pK_(a)(CH_(3)COOH) gt pK_(a) (CH_(3)CH_(2)COOH)` |
| Answer» Correct Answer - B | |
| 795. |
Which of the following does not exhibit electromeric effect?A. EthersB. AldehydesC. KetonesD. Alkenes |
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Answer» Correct Answer - A Only organic compounds having a multiple bond ( a double or triple bond) between same or different atoms show electromeric effect in the presence of an attacking reagent. |
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| 796. |
Examine the following two structures for the anilinium ion and choose the correct statement from the ones gives below: A. `II` is not an acceptable canonical structure because carbonium ions are less stable than ammonium ions.B. `II` is not an acceptable canonical structure because it is non-aromatic.C. `II` is not acceptable canonical structure because the nitrogen has `10` valence electrons.D. `II` is an acceptable canonical sturcture. |
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Answer» Correct Answer - C Elements of the second period of the periodic table like `N` cannot have more than eight electrons in their valence shell. Note that `N` is forming five bonds. |
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| 797. |
Which of the following groups shows the weakest `+R` effect?A. `O^(-)`B. `OH`C. `NH_(2)`D. `NR_(2)` |
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Answer» Correct Answer - B The `+R` effect of each group is generally in the following order: `O^(-)gt NH_(2)gt NR_(2)gtOH gt OMe, NHACgt MegtX` `O^(-)` has the strogest `+R` effect on account of its negative charge and lone pair of electrons. |
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| 798. |
The optically active molecule isA. B. C. D. |
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Answer» Correct Answer - C Others are meso compound due to presence of plane of symmetry. |
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| 799. |
The correct `pK_(a)` order of the following acids is : A. `I gt II gt III`B. `I gt III gt II`C. `III gt II gt I`D. `III gt I gt II` |
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Answer» Correct Answer - C On the basis of stability of conjugate base due to electronic effects. |
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| 800. |
Which of the following is the most stable carbocation .A. B. C. D. |
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Answer» Correct Answer - C Stability of alkyl carbocation `3^(º) gt 2^(º) gt 1^(º)` |
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