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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.
| 451. |
Which of the following compounds will produce the most stable carbonium ion ?A. `CH_(3)-underset(CH_(3))underset(|)CH-CH_(2)OH`B. `CH_(3)-overset(CH_(3))overset(|)underset(CH_(3))underset(|)C-OH`C. `CH_(3)-underset(OH)underset(|)CH-CH_(2)-CH_(3)`D. `CH_(3)CH_(2)CH_(2)CH_(2)OH` |
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Answer» Correct Answer - B `underset(A3^(@)"carbocation is most stable.")underset()underset()(CH_(3)-overset(CH_(3))overset(|)underset(CH_(3))underset(|)C-OHoverset(+H^(+))underset(-H_(2)O)rarrunderset(A3^(@) "carbocation")underset()(CH_(3)-overset(CH_(3))overset(|)underset(CH_(3))underset(|)(C^(+))))` |
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| 452. |
Write the compounds formula and IUPAC names of the following compounds known by their common names : (i) Neopentane (ii) Vinyl chloride (iii) Glycerol (iv) Tert-amyl alcohol. |
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Answer» (i) `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH_(3)` (2, 2-Dimethylpropane) (ii) `CH_(2)=CH-Cl` (chloroethene) (iii) `underset(OH)underset(|)(C)H_(2)-underset(OH)underset(|)(C)H-underset(OH)underset(|)(C)H_(2)` (Propane -1, 2, 3-triol) (iv) `CH_(3)-underset(OH)underset(|)overset(CH_(3))overset(|)(C) -CH_(2)-CH_(3)` (2-Methylbutan-2-ol) |
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| 453. |
Sate the nature of hybridisation of each carbon atom in the following compounds ? `(a) CH_(3)Cl" "(b) (CH_(3))_(2)C=O" "(c) CH_(3)-C equiv N" "(d) H-overset(O)overset("||")(C)-NH_(2)" "(e) CH_(3)-CH=CH-C equiv N` |
| Answer» `(a) sp^(3)" "(b) sp^(3), sp^(3), sp^(2)" "(c) sp^(3), sp" "(d) sp^(2)" "(e) sp^(3), sp^(2), sp^(2), sp` | |
| 454. |
The IUPAC name of `CH_(3)COCH (CH_(3))_(2)` is :A. 4-Methyl isopropyl ketoneB. 3-Methylbutan-2-oneC. Isopropylmethyl ketoneD. 2-Methylbutan-3-one |
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Answer» Correct Answer - B `{:(" "O),(" ||"),(overset(1)(C)H_(3)overset(2)(-C)-overset(3)(C)H-overset(4)(C)H_(3)),(" |"),(" "CH_(3)):}` 3-Methylbutan-3-one |
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| 455. |
The `IUPAC` name of `CH_(3)COCH(CH_(3))_(2)` isA. Isopropyl methyl ketoneB. 2-Methylisopropyl ketoneC. 4-Methylisopropyl ketoneD. 3-Methyl-2-butanone. |
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Answer» Correct Answer - D `underset("3-Methylbutan-2-one")underset()(overset(1)CH_(3)-overset(O)overset("2||")C-overset(3)underset(CH_(3))underset(|)(CH)-overset(4)CH_(3))` |
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| 456. |
IUPAC name of `(CH_(3)CH_(2)CO)_(2)O` isA. Prorionic anhydrideB. Dipropanoic anhydrideC. Ethoxypropanoic acidD. Propanoic anhydride. |
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Answer» Correct Answer - D Propanoic anhydride is the correct answer. |
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| 457. |
The IUPAC name of the compound `CH_(3)COCH (CH_(3))_(2)` is :A. Isopropyl methyl ketoneB. 2-Methylbutane-3-oneC. 4-Methylisopropyl ketoneD. 3-Methylbutane-2-one. |
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Answer» Correct Answer - D 3- Methylbutanone is the correct answer. |
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| 458. |
The masses of carbon, hydrogen and oxygen in ann organic compound are in the ratio 6:1:8 respectively. Which of the following pairs of formulae correspond to above information?A. `CH_(3)O and CH_(3)CHO`B. `CH_(2)O and C_(3)H_(6)O`C. `C_(3)H_(6)O and C_(2)H_(6)O_(2)`D. `C_(3)H_(6)O_(3) and HCHO` |
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Answer» Correct Answer - D In `C_(3)H_(6)O`, mass of 3C-atoms`=12xx3=36` mass of 6 H-atoms `=1xx6=6` mass of 3 O-atoms`=16xx3=48` `therefore`Ration of masses of `C:H:O` is 36:6:48 or 6:1:8, In HCHO, mass of 1C-atom=12 mass of 2 H-atoms=2 mass of 1 O-atom=16 `therefore`Ratio of masses of `C:H:O` is 12:2:16 orr 6:1:8 |
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| 459. |
The anolic form of acetone contains :A. 9 sigma bonds, 1 pi bonds and two lone pairsB. 8 sigma bonds, 2 pi bonds and two lone pairsC. 10 sigma bonds, 1 pi bonds and one lone pairsD. 9 sigma bonds, 2 pi bonds and one lone pairs |
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Answer» Correct Answer - A `{:(" "H" "H),(" |"" |"),(H-C=C-C-H),(" |"" |"),(H-underset(..)(O: )" "H),("Enol form of acetone"):}` `sigma`-Bonds = 9 `pi`-Bonds = 1 Lonepairs = 2 |
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| 460. |
Arrange the following resonating structures in order of increasing stability `underset((I))(CH_(2)=overset(+)(N)=overset(-)(N))" "underset((II))(H_(2)overset(+)(C)=N=overset(-)(N))" "underset((III))(H_(2)overset(-)(C)-overset(+)(N) equiv N)" "underset((IV))(H_(2) overset(-)(C)-N=overset(+)(N))` |
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Answer» The correct order of increasing stability is : `(I) gt (III) gt (II) gt (IV)` `*" "`Structure `(I)` is maximum stable because conjugation is maintained. `*" "`Structure `(IV)` is least stable because electronegative carbon atom has negative charge. `*" "` Out of structures `(II)` and `(III)`, the structure `(III)` is more stable because of the presence of triple bond between the two nitrogen atoms. |
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| 461. |
Consider the following compounds : Hyperconjugation occurs inA. III onlyB. I and IIIC. I onlyD. II only |
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Answer» Correct Answer - C The carbon atom acting as free radical has an `alpha`-hydrogen in conjugation with the `pi`-electrons of the ring. Therefore, hyperconjugation is shown only by structure (I). |
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| 462. |
Acetone `(CH_(3)COCH_(3))` and propanal `(CH_(3)CH_(2)CHO)` areA. functional isomersB. position isomersC. geometrical isomersD. optical isomers |
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Answer» Correct Answer - A Acetone `(CH_(3)COCH_(3))` and propanal `(CH_(3)CH_(2)CHO)` are functional isomers. |
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| 463. |
Statement-1 . The IUPAC name of the compound `{:(CH_(2)=CH-CH=CH-CH-C-=CH),(" |"),(" "CH=CH_(2)),(" 5-ethynylhepta-1,3,6-triene"):}` Statement-2. While numbering the carbon chain triple bond is given preference over the double bond.A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for statement-1.B. Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explanation for statement-1.C. Statement-1 is True, Statement-2 is False.D. Statement-1 is False, Statement-2 is False |
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Answer» Correct Answer - C Correct statement-2. Double bonds are given preference over triple bonds. |
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| 464. |
Assertion : IUPAC name of compound `CH_(3)CH=CH-CHO` is but-2-enal. Reason : Functional group gets preference over multiple bond in the IUPAC name of a compound.A. If both assertion and reason are correct and reason is correct explanation for assertion.B. If both assertion and reason are correct but reason is not correct explanation for assertion.C. If assertion is correct but reason is incorrect.D. If both assertion and reason are incorrect. |
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Answer» Correct Answer - A Reason is the correct explanation for assertion. |
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| 465. |
Assertion : Vapour density is the same thing as density. Reason : Molecular weight is twice density.A. If both assertion and Reason are true, and reason is the true explanation of the assertion.B. If both assertion and reason are true, but reason is not the true explanation of the assertion.C. If assertion is true, but reason is falseD. If both assertion and reason are false |
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Answer» Correct Answer - D Correct assertion. Vapour density and density are different things. Correct reason. Molecular weight is twice vapour density. |
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| 466. |
Statement-1. Free radicals are always planar. Statement-2. They can achieve `sp^(2)` as well as `sp^(3)`-hybridisation.A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for statement-1.B. Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explanation for statement-1.C. Statement-1 is True, Statement-2 is False.D. Statement-1 is False, Statement-2 is False |
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Answer» Correct Answer - D Correct statement-1. Free radicals can be either planar or pyramidal. |
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| 467. |
Statement-1: A compound with odd number of nitroen always contains odd molecular weight. and Statement-2: Nitrogen has odd molecular mass. |
| Answer» Correct Answer - C | |
| 468. |
Statement-1: Aldehydes and ketones having same molecular formulae are structural isomers and Statement-2: Aldehyde and ketones are metamers.A. Statement -I is True; Statement -II is True; Statement-II is a correct explanation for Statement-IB. Statement - I is True; Statement -II is true; Statement-II is not a correct explanation for Statement-IC. Statement -I is false; Statement -II is False.D. Statement -I is False; Statement -II is True |
| Answer» Correct Answer - C | |
| 469. |
Given below are the structures of few compounds with molecular formula `C_(4)H_(10)O`. Select metamers from these structures. (i) `CH_(3)-O-CH_(2)CH_(2)CH_(3)` (ii) `CH_(3)CH_(2)CH_(2)CH_(2)OH` (iii) `CH_(3)-CH_(2)-O-CH_(2)-CH_(3)` (iv) `CH_(3)-underset(OH)underset(|)(C)H-CH_(2)-CH_(3)`A. (i) and (ii)B. (ii) and (iii)C. (i) and (iii)D. (ii) and (iv) |
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Answer» Correct Answer - C `CH_(3)OCH_(2)CH_(2)CH_(3) and CH_(3)CH_(2)OCH_(2)CH_(3)` are metamers. (ii) and (iv) i.e., `CH_(3)CH_(2)CH_(2)CH_(2)OH and CH_(3)-underset(OH)underset(|)(C)H-CH_(2)-CH_(3)` are position isomers. |
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| 470. |
Arrange the following in increasing order of C-C bond length : `C_(2)H_(6), C_(2)H_(4), C_(2)H_(2)`. |
| Answer» `C_(2)H_(2) ("120 pm") lt C_(2)H_(4) ("134 pm") lt C_(2)H_(6) ("154 pm")` | |
| 471. |
Chromatography is a recent and most effective technique which was used by Tsweff, a botanist for the separation of coloured substances into individual constutients. The name Chromatography means colour writing (In Greek , Chrome = colour, graphy = writing). However, the name as such has lost its significance. The technique can be used to separate constituents from any mixture whether coloured or colourless. (i) What is the basic of Chromatographic separation ? (ii) What is the value associated with it ? |
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Answer» (i) Chromatography is based on selective distribution of the various constituents of a mixture between two phases, a stationary phase and a mobile phase. Different constituents migrate at different rates through stationary phase. (ii) Chromatography is very useful for the separation of constituents and their identification from a mixture available in very small amount (even less than 5 mg or 1 mL). However, other methods of separation are not effective in such cases. |
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| 472. |
A student was asked by his teacher to separate an impure sample of sulphur containing sand as the impurity. He tried to purify it with the help of sublimation. But he was not successful. Particles of sulphur of sulphur could not be separated completely from sand. (i) Why did the sublimation process succeed ? (ii) Suggest an alternate method to affect the separation. (iii) What is the value based information associated with this ? |
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Answer» (i) Sulphur is not of volatile nature. Upon heating it melts. Therefore, sublimation process could not succeed. (ii) The student should have dissolved the impure sample in carbon disulphide. It is a liquid in which sulphur completely dissolves while iron does not. From the solution, can be recovered with the help of crystallization process. (iii) The process of sublimation is useful only if one of the constituents present in the mixture can sublime while the others do not undergo sublimation. |
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| 473. |
Identify the reagents shown in bold in the following equations as nucleophiles or electrophiles (a) `CH_(3)COOH + HO^(-) rarr CH_(3)COO^(-) + H_(2)O` (b) `CH_(3)COCH_(3) + .^(-)CN rarr (CH_(3))_(2)C(CN)(OH)` (c) `C_(6)H_(6) + CH_(3)overset(+)(C)O rarr C_(6)H_(5)COCH_(3)` |
| Answer» Nucleophiles : (a) and (b) Electrophile : (c). | |
| 474. |
Which of the following is/are alicylic hetero-cyclic compound ?A. TetrahydrofuranB. TetrahydropyrroleC. TetrahydrothiopheneD. All |
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Answer» Correct Answer - D All are alicyclic heterocyclic compounds. |
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| 475. |
The arrangement of `(CH_(3))_(3)C-, (CH_(3))_(2)CH-, CH_(3)CH_(2^(-))` when attached to benzene or unsaturated group in increasing order of inductive effect isA. `(CH_(3))_(3)C- lt (CH_(3))_(2)CH- lt CH_(3)CH_(2^(-))`B. `CH_(3)CH_(2) - lt (CH_(3))_(2)CH- lt (CH_(3))_(3)C-`C. `(CH_(3))_(2)CH - lt (CH_(3))_(3)C- lt CH_(3)CH_(2)-`D. `(CH_(3))_(3)C- lt CH_(3)CH_(2)- lt (CH_(3))_(2)CH-` |
| Answer» Correct Answer - A | |
| 476. |
The secondary suffix and the secondary prefix for the functional group,`-overset(O)overset(||)C-Cl` respectively are :A. oyl chloride, chlorocarbonylB. chlorocarbonyl, oyl chlorideC. oyl chloride, yl chlorideD. yl chloride, oyl chloride |
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Answer» Correct Answer - A See the nomenclature. |
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| 477. |
Can `-NO_(2)` group act as secondary suffix ? |
| Answer» No, it is a primary suffix or substituent. | |
| 478. |
Structures and IUPAC names of some hydrocarbons are given below. Explain why the names given in the parentheses are incorrect. `underset(["and not 3,4,7-Trimethyloctane"])underset(2,5,6- "Trimethyloctane")(CH_(3)-underset(CH_(3))underset(|)(CH)-CH_(2)-CH_(2)-underset(CH_(3))underset(|)(CH)-underset(CH_(3))underset(|)(CH)-CH_(2)-CH_(3))` `underset(["and not 5-Ethyl-3-methylheptane"])underset("3-Ethyl-5-methylheptane")(CH_(3)-CH_(2)-underset(CH_(2)CH_(3))underset(|)(CH)-CH_(2)-underset(CH_(3))underset(|)(CH)-CH_(2)-CH_(3))` |
| Answer» (a) Lowest locant number, 2,5,6 is lower than 3,5,7, (b) substituents are in equivalent position, lower number is given to the one that comes first in the name according to alphabetical order. | |
| 479. |
Among the following, the true property about A. non-polarB. `overset(+)C" is "sp^(2)`-hybridizedC. electrophile can attack `C^(+)`D. does not undergo hydrolysis |
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Answer» Correct Answer - B `C^(+)` in carbocations is always `sp^(2)`-hybridized. |
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| 480. |
Consider the following carbocations (I)`C_(6)H_(5)overset(+)CH_(2)` , (II)`C_(6)H_(5)CH_(2)overset(+)CH_(2)` (III)`C_(6)H_(5)overset(+)CHCH_(3)` , (IV) `C_(6)H_(5)overset(+)C(CH_(3))_(2)` The correct sequence for the stability of these isA. `IIltIltIIIltIV`B. `IIltIIIltIltIV`C. `IIIltIltIIltIV`D. `IVltIIIltIltII` |
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Answer» Correct Answer - A IV is stabilised by +I effect of two `CH_(3)` groups and by dispersal of + ve charge on the benzene ring by resonance. III is stabilized by + I effect of one `CH_(3)` group and by dispersal of + ve charge on the benzene ring. I is stabilized by dispersal of +ve charge on the benzene ring. II is not stabilized by any of the above factors `therefore `over all order of stability is `IIltIltIII ltIV` Hence (A) is correct. |
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| 481. |
Consider the following carbocations. (i) `Cl_(3)overset(+)(C)` (ii) `Cl_(2)overset(+)(C)H` (iii) `ClCH_(2)^(+)` (iv) `overset(+)(C)H_(3)` The stability sequence follows the order :A. `(iv) lt (i) lt (ii) lt (iii)`B. `(i) lt (ii) lt (iii) lt (iv)`C. `(iv) lt (i) lt (iii) lt (ii)`D. `(iv) lt (ii) lt (i) lt (iii)` |
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Answer» Correct Answer - B Cl due to its -I effect further intensifies the +ve charge and thus destabilizes the carbocation. Thus, as the number of Cl atoms increases, the stability further decreases. Thus, option (b) is correct. |
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| 482. |
In which of the following, resonance of `-NH_(2)` group is possible ?A. 1-AminobutaneB. EthylamineC. BenzylamineD. p-Toluidine |
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Answer» Correct Answer - D Only in p-toluidine (4-methylaniline), the `-NH_(2)` group is directly attached to the benzene ring and hence resonance is possible. |
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| 483. |
Which has the smallest C-H bond length :A. ethaneB. ethyneC. etheneD. Benzene. |
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Answer» Correct Answer - B See Comprehensive Review. |
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| 484. |
The maximum number of carbon atoms arranged in a straight line in the molecule, `CH_(3)-CequivC-CH=CH-CH_(3)`A. 5B. 4C. 3D. 6 |
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Answer» Correct Answer - B All the atoms directly linked to sp carbon will be in one straight line `underset(i.e, C_(3),C_(4),C_(5)" and "C_(6)"are in linear positions".)underset()(overset(6)(CH_(3))-overset(5)Cequivoverset(4)C-overset(3)CH=overset(2)CH-overset(1)CH-overset(1)(CH_(3)))` |
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| 485. |
Inductive effect involveA. Delocalisation of `sigma`-electronsB. Partial displacement of `sigma`-electronsC. Delocalisation of `pi`-electronD. Displacement of lone pair |
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Answer» Correct Answer - B Partial displacement of `sigma`-electrons. |
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| 486. |
Arrange the following free radicals in order of stability `underset(I)underset()((CH_(3))_(3)overset(cdot)C)" "underset(II)underset()((CH_(3))_(2)overset(cdot)CH)" "underset(III)underset()(CH_(3)overset(cdot)CH_(2))" "underset(IV)underset()(overset(cdot)CH_(3))`A. `IgtIIgtIIIgtIV`B. `IVgtIIIgtIIgtI`C. `IIgtIIIgtIgtIV`D. `IVgtIIgtIIIgtI.` |
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Answer» Correct Answer - A See Comprehensive Review. |
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| 487. |
The alkene that exhibits geometrical isomerism isA. propaneB. `2`-methyl propeneC. `2`-buteneD. `2-`methyl-`2`-butene |
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Answer» Correct Answer - C There are four stereoisomers : `{:("cis-R",,"cis-S"),("trans-R",,"trans-S"):}` |
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| 488. |
In hyperconjugation of an alkene there is overlap between :A. `p-and pi-orbitals`B. `2 pi-orbitals`C. `d-and pi-orbitals`D. `sigma-and pi-orbitals`. |
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Answer» Correct Answer - D See the hyperconjugation. |
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| 489. |
An alkene exists as geometrical isomers. The minimum number of carbon atoms in the molecule isA. `1`B. `2`C. `3`D. `4` |
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Answer» Correct Answer - A `CH_(3)-CH=CH-CH_(3)` but-`2`-ene is the `1^(st)` member which can show geometric isomerism. |
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| 490. |
Arrange the following free radicals in order of stability `underset(I)underset()("Beznyl"),underset(II)underset() (" Allyl"),underset(III)underset() (" Methyl"), underset(IV)underset()(" Vinyl",)`A. `IVgtIIIgtIIgtI`B. `IgtIIgtIIIgtIV`C. `IIgtIVgtIIIgtI`D. `IIIgtIIgtIgtIV` |
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Answer» Correct Answer - D See Comprehensive Review. |
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| 491. |
Which of the following alkyl groups has the maximum `+I` effect?A. `(CH_(3))_(2)CH-`B. `(CH_(3))_(3)C-`C. `CH_(3)CH_(2^(-))`D. `CH_(3^(-))` |
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Answer» Correct Answer - B Order of `+I=(CH_(3))_(3)Crarr(CH_(3))_(2)CHrarrCH_(3)CH_(2)rarr-CH_(3)`. |
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| 492. |
Of the following groups which has an electron repelling inductive effect :A. `-OCH_(3)`B. `-NO_(2)`C. `C_(2)H_(5)-`D. `C_(6)H_(5)-`. |
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Answer» Correct Answer - C More stable (lower the energy) the resonating structure, more will be its contribution to the resonance hybrid. |
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| 493. |
Arrange the following carbonium ions in order of decreasing stability : `underset(I)underset()((CH_(3))_(3)overset(+)C)" "underset(II)underset()((CH_(3))_(2)overset(+)CH)" "underset(III)underset()(CH_(3)overset(+)CH_(2))" "underset(IV)underset()(overset(+)H_(3)C)`A. `IIgtIIIgtIgtIV`B. `IVgtIIIgtIIgtI`C. `IgtIIgtIIIgtIV`D. `IgtIIgtIIIgtIV` |
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Answer» Correct Answer - C See Comprehensive Review. |
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| 494. |
The increasing order of electron donating inductive effect of alkyl groups isA. `-H lt -CH_(3) lt -C_(2)H_(5) lt -C_(3)H_(7)`B. `-Hgt-CH_(3)gt-C_(2)H_(5)gt-C_(3)H_(7)`C. `-H lt -C_(2)H_(5) lt -CH_(3) lt -C_(3)H_(7)`D. `-H gt -C_(2)H_(5) gt -CH_(3) gt -C_(3)H_(7)` |
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Answer» Correct Answer - A The order of +I effect of alkyl group is given as `-H lt -CH_(3) lt -CH_(2)-CH_(3) lt CH_(3)-overset(CH_(3))overset(|)(C)H-` |
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| 495. |
Which one of the following has inductive, mesomeric and hyperconjugation effect?A. `CH_(3)Cl`B. `CH_(3)-CH=CH_(2)`C. `CH_(3)-CH=CH-underset(O)underset(||)C-CH_(3)`D. `CH_(2)=CH-CH=CH_(2).` |
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Answer» Correct Answer - C `CH_(3)-CH=CH-underset(O)underset(||)C-CH_(3)` Compound (C) has all the three effects inductive mesomeric and hyperconjugation). |
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| 496. |
The inductive effect of the alkyl groups on a saturated carbon chain follows the orderA. `(CH_(3))_(2)C-gt(CH_(2))_(2)CH-gtCH_(3)-CH_(2)-gtCH_(3)-`B. `CH_(3)-gtCH_(3)-CH_(2)-gt(CH_(3))_(2)CH-gt(CH_(3))_(3)C-`C. `CH_(3)CH_(2)-gtCH_(3)-gt(CH_(3))_(3)C-gt(CH_(3))_(2)CH-`D. `(CH_(3))_(2)CH-gt(CH_(3))_(3)C-gtCH_(3)-gtCH_(3)CH_(2)-` |
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Answer» Correct Answer - A See Comprehensive Review. |
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| 497. |
Which of the following is active species in sulphonation of benzene ?A. `H_(2)SO_(4)`B. `SO_(3)`C. `HSO_(3)^(+)`D. `SO_(3)^(+)` |
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Answer» Correct Answer - B The electrophilic involved in sulphonation of benzene is `SO_(3)`. |
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| 498. |
Inductive effect involves :A. `sigma`-electronsB. `pi`-electronsC. BothD. None. |
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Answer» Correct Answer - A Inductive effect involves `alpha`-electrons. |
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| 499. |
Which of the following cannot exhibit hyperconjugation?A. `CH_(3)overset(.)(CH_(2))`B. C. `CH_(3)CH=CH_(2)`D. `(CH_(3))_(3)C-overset(+)(CH_(2))` |
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Answer» Correct Answer - D Those species wghich more `alpha-H` then it will show maximum hyperconjugation. |
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| 500. |
Which one of the following series contains electrophiles only ?A. `H_(2)O,SO_(3),H_(3)O^(+)`B. `NH_(3),H_(2)O,AlCl_(3)`C. `AlCl_(3),SO_(3),overset(+)NO_(2)`D. `H_(2)O,overset(+)Cl,NH_(3).` |
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Answer» Correct Answer - C `AlCl_(3), SO_(3)" and "overset(+)NO_(2)` are electrophiles. |
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