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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.
| 251. |
The number of structural isomers possible from the molecular formula `C_(3)H_(9)N` isA. 4B. 5C. 2D. 3 |
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Answer» Correct Answer - A Structure isomers of `C_(3)H_(9)N` are `{:(CH_(3)-CH_(2)-CH_(2)-NH_(2)"," CH_(3)-CH-CH_(3)","),(" |"),(" "NH_(2)):}` `{:(CH_(3)-NH-CH_(2)-CH_(3)"," CH_(3)-N-CH_(3)),(" |"),(" "CH_(3)):}` Total = 4 |
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| 252. |
If the light waves pass through a nicol prism then all the oscillations occur only in one plane, such beam of light is called asA. Non-polarised lightB. Plane polarised lightC. Polarised lightD. Optical light |
| Answer» Correct Answer - B | |
| 253. |
Consider the following conformation of 3-Aminopropanal Amongst the above conformation (P,Q,R,S) one of tehem is most stable This can be attributed due to A. H-bonding in the conformerB. Gauche conformation In the conformerC. Anti conformation in the conformerD. Large groups being separated by maximum distance in the conformer |
| Answer» Correct Answer - A::D | |
| 254. |
The dihedral angle between two methyl group in partially eclipsed conformation of n-butane isA. `180^(@)`B. `120^(@)`C. `90^(@)`D. `109_(28^(1))^(@)` |
| Answer» Correct Answer - B | |
| 255. |
Select the correct statements:A. Eclipsed and staggered ethanes given differet produces on reaction with chlorine in presence of light.B. The ocnformational isomers can be isolated at room temperatureC. Torsional strain in ethane is minimum at dihedral angel `60^(@), 180^(@) and 300^(@)`D. Steric strain in minumum in staggered gauche form of n-butane |
| Answer» Correct Answer - C | |
| 256. |
When isomers have the same structural formula but differ in relative arrangement of atoms or groups are calledA. MesomersB. StereoisomersC. Optical isomersD. Geometrical mesomers |
| Answer» Correct Answer - B | |
| 257. |
Name the compound, that is no isomer with diethyl etherA. n-propylmethyl etherB. Butane-1-olC. 2-methylpropane-2-olD. Butanone |
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Answer» Correct Answer - D Butanone `CH_(3)-underset(O)underset(||)(C)-CH_(2)-CH_(3)(C_(4)H_(8)O)` is not an isomer of `C_(2)H_(5)-O-C_(2)H_(5)C_(4)H_(5)(C_(4)H_(10)O)` |
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| 258. |
Which statement is correct about anti-conformation of `1`-Chloropropane?A. It is the most polar formB. It has maximum torsional strainC. It has minimum steric strainD. A and C both |
| Answer» Correct Answer - D | |
| 259. |
Consider of the following molecules: A. `IIIgtIIgtIVgtI`B. `IVgtIgtIIIVgtII`C. `IVgtIIIgtIIgtI`D. `IIIgtIVgtIIgtI` |
| Answer» Correct Answer - A | |
| 260. |
The isomer of diethyl ether isA. `(CH_(3))_(2)CHOH`B. `(CH_(3))_(3)C-OH`C. `C_(3)H_(7)OH`D. `(C_(2)H_(5))_(2)CHOH` |
| Answer» Correct Answer - B | |
| 261. |
Which can show tautomerism?A. B. C. D. HCN |
| Answer» Correct Answer - A::B::C::D | |
| 262. |
Among the following, the most stable isomer is :A. B. C. D. |
| Answer» Correct Answer - D | |
| 263. |
Which Newman projectin shows the most stable conformation of the following compound? A. B. C. D. |
| Answer» Correct Answer - A | |
| 264. |
Which of the Newman projections shown below represents the most stable conformation about the `C_(1)-C_(2)` bond of 1-iodo-2-methyl propane?A. B. C. D. |
| Answer» Correct Answer - C | |
| 265. |
The bond dissociation enthalpies of `-=underset(sp)CH-=underset(sp^(2))CH-underset(sp_(3))CH` follows the orderA. `sp gt sp^(2) gt sp^(3)`B. `sp^(3) gt sp^(2) gt sp`C. `sp^(2) gt sp gt sp^(3)`D. `sp gt sp^(3) gt sp^(2)` |
| Answer» Correct Answer - a | |
| 266. |
Which of the following C-H bond has the lowest bond dissociation energyA. Primary `(1^(@))C-H` bondB. Secondary `(2^(@))C-H` bondC. Tertiary `(3^(@)) C-H` bondD. All of these |
| Answer» Correct Answer - C | |
| 267. |
Which of the following represents the true order of bond dissociation energy of the idicated `C-H` bond of the following molecules? A. `IltIIltIVltIII`B. `IIIltIVltIIltI`C. `IVltIIltIltIII`D. `IIIltIVltIIltI` |
| Answer» Correct Answer - A | |
| 268. |
Select the correct option.A. Isoelectric point is the pH at which an amino acid exists primarily in its neutral formB. Isoelectric point is the average of `pK_(a)` values of `alpha-COOH` amino `alpha-NH_(3)^(+)` groups [valid only for neutral amino acid]C. Glycine is characterised by two `pK_(a)` valuesD. For neutral amino acid the concentration of zwitter ion is maximum at its isoelectric point. |
| Answer» Correct Answer - A::B::C::D | |
| 269. |
Which of the following carbohydrates develops a deep blueback colour on treatment with iodine solution?A. GlucoseB. AmyloseC. StarchD. Fructose |
| Answer» Correct Answer - B::C | |
| 270. |
Rank the following solvents in decrasing order of abilioty to dissolve given compound . A. `Et_(2) Ogt H_(2) OgtEtOH `B. `H_(2)OgtEtOH gt Et_(2)O`C. `H_(2)OgtEtOH gt EtOH`D. `Et_(2)OgtEtOh gtH_(2)O` |
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Answer» Correct Answer - D Like dissolve like concept |
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| 271. |
The correct statement(s) concerning the structures E, F and G is/are A. E, F and G are resonance structureB. E, F and E, F are tautomersC. F and G are geometrical isomersD. F and G are diastereomers |
| Answer» Correct Answer - B::C::D | |
| 272. |
For the following two acid-base reactions, which statement is true ? (I) `CH_(3)CH_(2)^(-) + CH_(3)NH_(2)rArr CH_(3)CH_(3)+CH_(3)NH^(-)` (II)`F^(-)+ underset(pK_(a)15.7)H_(2)OrArr underset(pK_(a)=3.52)HF+HO^(-)`A. I is favoured to the right, II is favoured to the leftB. I is favoured to the left, II is favoured to the rightC. I is favoured to the right, II is favoured to the rightD. I is favoured to the left, II is favoured to the left |
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Answer» Correct Answer - A Acid base reactions favours formation of weak acid & weak base. |
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| 273. |
The correct statement(s) concerning the structure P,Q,R & S is/are A. Q & S are not resonating structuresB. R & S are resonating structuresC. P & R are tautomersD. P & Q are resonating structures |
| Answer» Correct Answer - A::B::C::D | |
| 274. |
Int the following acid-base reaction, in which can backward reaction if favoured ?A. B. `KH+EtOHhArr`C. `Me_(3)CO^(Ө)+H_(2)OhArr`D. |
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Answer» Correct Answer - D Acidic base reactions favours weak acid & weak base. |
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| 275. |
Which of the following reactions favour backward direction ?A. B. C. D. |
| Answer» Correct Answer - B::D | |
| 276. |
Which of the following cations is most stable?A. B. C. D. |
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Answer» Correct Answer - D `3^(@)` cantion, (a) is highly destabilise as +ive charge is present on bridgehead carbon. |
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| 277. |
In which of the following reactions, backward reaction I facoured ?A. B. C. `CH_(3)CH_(2)overset(+)SH_(2)+CH_(3)CH_(2)OHrArrCH_(3)CH_(2)SH+CH_(3)CH_(2)underset(H)underset(|)overset(o+)O-H`D. |
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Answer» Correct Answer - D Acid base reaction facours weak acid & weak base. . |
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| 278. |
Which of the following cations is most stable?A. B. C. D. |
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Answer» Correct Answer - B All atoms have complete octet configuration. |
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| 279. |
`underset((I))(CH_(2)=CH-CH=CH-CH_(3))` is more stable than `underset((II))(CH_(3)-CH=C=CH-CH_(3))` becauseA. there is resonance is but not in IIB. there is tautomerism in I but not in IIC. there is hyper conjugation in I but not in IID. II has more canonical structural than I. |
| Answer» Correct Answer - A | |
| 280. |
The carbocation `(CH_(3))_(3)C^(+)` is stabilized primarily byA. hyperconjugationB. tautomerismC. resonanceD. conjugation |
| Answer» Correct Answer - A | |
| 281. |
Which of the following does not represent structure of ? A. B. C. D. |
| Answer» Correct Answer - B | |
| 282. |
Choose the correct staement :A. I effect operate in both `sigma` and `pi` bondsB. I effect create net charge in moleculeC. I effect transfer eletron from one carbon to anotherD. I effect create partial charges and it is distance dependent |
| Answer» Correct Answer - D | |
| 283. |
Among following cations which are more stabilized than A. B. `CH_(3)-underset(H)underset(|)overset(* *)N-overset(o+)CH_(2)`C. `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C^(o+))`D. `CH_(2)=CH-overset(o+)CH_(2)` |
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Answer» Correct Answer - A::B::C (a) is aromatic (b) is stabilise because of coplete octet. `3^(@)` cation is more stabilise than `1(@)` aromatic |
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| 284. |
The correct stability order for the following species is : A. `(II) gt (IV) gt (I) gt (III)`B. `(I) gt (II) gt (III) gt (IV)`C. `(II) gt (I) gt (IV) gt (III)`D. `(I) gt (III) gt (II) gt (IV)` |
| Answer» Correct Answer - D | |
| 285. |
The correct stability order of following species is : A. `XgtYgtWgtZ`B. `YgtZgtWgtZ`C. `XgtWgtZgtY`D. `ZgtXgtYgtW` |
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Answer» Correct Answer - C X is highly stabilise as all double bonds are anti. is highly destabilise as it is antiaromatic in nature. Z is less stabilise than X and W as repulsion occur among electrons in cumulative diene. |
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| 286. |
Decreasing order of potential energy of the following cations is : A. `IIgtIgtIII`B. `IgtIIgtIII`C. `IIIgtIIgtI`D. `IIIgtIIgtI` |
| Answer» Correct Answer - A | |
| 287. |
Identify each species in the following equilibrium according tot the code : SA=stronger acid, SB =stronger base , WA = weaker acid , WB = weaker base. The `pK_(a)` of `(CH_(3))_(2)NH` is 36 , the `pK_(a)` of `CH_(3)OH` is `15.2` `{:(CH_(3)OH+(CH_(3))_(2)NHhArrCH_(3)-O^(-) +CH_(3)-overset(+)NH-CH_(3)),(" "1" "2" "|),(" "H):}`A. `overset(1)WA " " overset(2)WB`B. `overset(1)SA " " overset(2)SB`C. `overset(1)SB " " overset(2)SA`D. `overset(1)SB overset(2)SA` |
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Answer» Correct Answer - A Equilibrium favour formation of waek acid and weak base. |
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| 288. |
Intermolecular hydrogen bonding strongest in :A. methylamineB. phenolC. formaldehydeD. methanol |
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Answer» Correct Answer - B Extent of H-bonding `propo+delta` charge on H. |
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| 289. |
Stability order of the following species ? A. `IgtIIgtIII`B. `IIIgtIgtII`C. `IIIgtIIgtI`D. `IgtIIIgtII` |
| Answer» Correct Answer - A | |
| 290. |
The hydrogen bonding is stronger in which one of the following set ?A. `F-H"----"F`B. `O-H"----"S`C. `S-H"---"F`D. `F-H"---"O` |
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Answer» Correct Answer - A `F-H"------"F` is stronger H-bonding . |
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| 291. |
In which of the following first resonating structure is more stable than the second ?A. `Coverset(Theta)H_(2)-CH=OlarrrarrCH_(2)=CH-O^(Theta)`B. `Coverset(o+)H_(2)-O-CH_(3)larrrarrCH_(2)=overset(o+)O-CH_(3)`C. `CH_(2)=CH-NH_(2)larrrarrCoverset(Theta)H_(2)-CH=overset(o+)NH_(2)`D. `overset(o+)O-CH=CH_(2)larrrarrO=CH-overset(o+)CH_(2)` |
| Answer» Correct Answer - C | |
| 292. |
Which will be the least stable resonating structure :A. `CH_(2)=CH-overset(o+)CH-overset(Theta)CH-O-CH_(3)`B. `overset(Theta)CH-overset(o+)CH-CH=CH-OCH_(3)`C. `overset(Theta)CH-CH=CH-CH=overset(o+)O-CH_(3)`D. `CH_(2)=CH-overset(Theta)CH-CH=overset(o+)O-CH_(3)` |
| Answer» Correct Answer - A | |
| 293. |
Explain which is a stronger acid `CH_(3)CH_(3)&BrCH_(2)NO_(2)` |
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Answer» Correct Answer - 2 2nd part-electron withdrawing group increases acidic strength |
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| 294. |
Which of the following solvents are aprotic?A. `H_(3)C-overset(O)overset(||)S-CH_(3)`B. `CH_(3)-overset(O)overset(||)C-OH`C. D. `H-S-H` |
| Answer» Correct Answer - A::C | |
| 295. |
Select the most stable structure in each of the following |
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Answer» Correct Answer - A-b ; B-b ; C-a Consider hyperconjugation and resonance of C=C in all the parts. |
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| 296. |
Identify the following solvents as polar protic (PP) , polar aprotic (PA), nono-polar protic (NPP) or non-polar aprotic (NPA) |
| Answer» Correct Answer - A-PA; B-P P; C-NPA; D-PA | |
| 297. |
Match the column I and II (Matrix) `{:(,"Column I",,"Column II"),((a),-NO_(2),(p),m " effect"),((b),-O^(-),(q),+m " effect"),((c),-O-CH_(3),(r),- I " effect"),((d),-C-=N,(s),-I" effect):}` |
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Answer» Correct Answer - a-p ,s ; b-q,r ; c-q,s ; d-p,s `a rarrp, s, b rarr q,r, crarrq,s,d rarr p,s` |
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| 298. |
Match the column. (Matrix) |
| Answer» Correct Answer - a-s; b-r; c-q;d-p | |
| 299. |
Arrange in the order as directed- Arrange the following in the order of their acidic stength (1-most acidic, 4-least acidic ) |
| Answer» Correct Answer - A-1, B-3, C-2, D-4 | |
| 300. |
Arrange in the order as directed- Arrange the following alkenes in order of their stability . (1 =most stable ,5 =least stable ). |
| Answer» Correct Answer - A-1, B-2, C-3, D-4 | |