InterviewSolution
Saved Bookmarks
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.
| 301. |
Stability of `pi`-bond in following alkenes in the increasing order is : `underset("(I)")CH_(3)-CH=CH-CH_(3)" "underset("(II)")(CH_(3)-underset(CH_(3))underset(|)C=underset(CH_(3))underset(|)C-CH_(3))" "underset("(III)")(CH_(3)-underset(CH_(3))underset(|)C=CH_(2))" "underset("(IV)")(CH_(3)-underset(CH_(3))underset(|)C=CH-CH_(3))`A. `IltIIIltIVltII`B. `IltIIltIIIltIV`C. `IVltIIIltIIltI`D. `IIltIIIltIVltI` |
|
Answer» Correct Answer - A Stability `prop` Number of hyperconjugative H-atoms. |
|
| 302. |
Arrange in the order as directed- The given alkenes in the order of their stability (1,most stable , 3-least stable ). |
| Answer» Correct Answer - A-3, B-2, C-1 | |
| 303. |
Correct order of stability of following alkenes is A. `IgtIIgtIII`B. `IfgtIIIgtII`C. `IIIgtIIgtI`D. `IIIgtIgtII` |
| Answer» Correct Answer - C | |
| 304. |
The kind of delocalisation involving sigma bond orbitals is called………..A. HyperconjugationB. mesomeric effectC. Electromeric effectD. inductive effect |
|
Answer» Correct Answer - A Whereas resonance effect involves delocaliation of `pi` electrons of two or more conjugated multiple bonds or `pi` electrons of a multiple bond and non-bonding (i.e., `n-` electrons) of a heteroatom, hyperconjuction involves delocalization of `sigma` electrons through overlapping of `p` orbitals of a multiple bonds with `sigma` orbital of the adjacent single bond, i.e., `sigma, pi` conjugation. |
|
| 305. |
The kind of delocalisation involving sigma bond orbitals is called……….. |
| Answer» Correct Answer - Hyperconjugation | |
| 306. |
All the carbon-carbon bond lengths are equal inA. `CH_(2)=CH-CH_(2)-CH_(3)`B. C. `CH_(3)-CH=CH-CH_(3)`D. `CH_(2)=CH-CH=CH_(2)` |
| Answer» Correct Answer - B | |
| 307. |
The kind of delocalization involving sigma bond orbitals is scalledA. Inductive effectB. Hyperconjugation effectC. Electromeric effectD. Mesomeric effect |
| Answer» Correct Answer - B | |
| 308. |
A reaction meachanism does not include a description ofA. bonds broken and formedB. all intermediates and transition statesC. relative rates of the discrete stepsD. yield of the products. |
|
Answer» Correct Answer - D For the same reaction mechanism, yields of the products are decided by nature of reactants, i.e., subsrate and attacking reagent. |
|
| 309. |
Which of the following is true about the cycloheptatrienyl free radical ?A. It is an isolatable stable free radicalB. It is an aromatic free radicalC. It has `4n+2pi` electronsD. None of these |
| Answer» Correct Answer - D | |
| 310. |
Which is not stable at room temperature ?A. B. C. D. |
|
Answer» Correct Answer - C Anti aromatic compounds are unstable at room temperature. |
|
| 311. |
Which of the following has no sterogenic centreA. B. C. D. |
|
Answer» Correct Answer - C Compound ( C) do not contain assymetric carbon |
|
| 312. |
Which of the following group (s) is/are `o-` and p-directing ?A. `- CN`B. `- SO_3 H`C. `- NH_2`D. `-O- overset(O)overset(||)(C)-R` |
|
Answer» Correct Answer - C::D (c,d) Here, `-ddot N H_2` and `ddot underset(..)O-overset(O)overset(||)(C)-R` have `L P overline e^, s` which can be donated to benzene ring and activate it at `o-` and p-position and thus and `o-` and p-directing. |
|
| 313. |
A compound contains 2 dissimilars asymmetric carbon atoms. The number of optically active isomers isA. 2B. 3C. 4D. 5 |
|
Answer» Correct Answer - 3 No. of optically active isomers in compounds with 2 dissimilarasymmetric carbon atoms `=2^(n)` |
|
| 314. |
Which of the following can have mesoisomerA. `CH_(2)OHCHOHCHO`B. `CH_(2)OHCHOHCHOHCHO`C. `HOOC CHOHCHOHCOOH`D. `HOH_(2)C CHOHCHOHCOOH` |
| Answer» Correct Answer - 3 | |
| 315. |
Which of the followingf is optically active?A. GlycerineB. AcetaldehydeC. GlyceraldehydeD. Acetone |
| Answer» Correct Answer - 3 | |
| 316. |
The number of isomeric amines possible for the formula `C_(3)H_(9)N`A. 4B. 3C. 5D. 6 |
| Answer» Correct Answer - 1 | |
| 317. |
Which of the following molcule contains asymmetric carbonA. `CH_(3)CHClCOOH`B. `CH_(3)CH_(2)COOH`C. `ClCH_(2)CH_(2)COOH`D. `Cl_(2)CHCOOH` |
| Answer» Correct Answer - 1 | |
| 318. |
Which of the following compound has zero dipole moment?A. 1,1-Dichloro ethyleneB. Cis-1,2-dichoroethyleneC. Trans-1,2-dichoroethyleneD. Both 2 and 3 |
| Answer» Correct Answer - 3 | |
| 319. |
Identify the compound that exhibits tautomerismA. 2-PentanolB. PhenolC. 2-ButanoneD. Lactic acid |
| Answer» Correct Answer - 3 | |
| 320. |
Amongst the following compounds, the optically active alkane having lowest molecular mass isA. `CH_(3)-CH_(2)-C-=CH`B. `CH_(3)-CH_(2)-overset(CH_(3))overset(|)CH-CH_(2)D`C. D. `CH_(3)-CH_(2)-CH_(2)-CH_(3)` |
| Answer» Correct Answer - 2 | |
| 321. |
Assertion:- Boiling point of cis-2-butene is more than trans-2-butene. Reason:- Dipole moment of cis-2-butene is more than trans-2-butnen.A. both A and R are true and R is the correct explantion of AB. both A and R are true and R is not the correct explantion of AC. A is true but R is falseD. A is false but R is true |
| Answer» Correct Answer - 1 | |
| 322. |
An organic compound having a carbon attached to four different group is optically actve, But is it that opposite is also true? That is, do all optically active organic compounds have chiral carbons? Not necessarily. Presence or absence of chiral centre is not the sufficiet criterion for optical activity. The ultimate criterion is presence or abosence of either plane or centre of symmtry. Two compounds which are non super im[osabble mirror images of each other are called enantiomers. If a compound contains more than one chiral carbon, new words are required to describe the relationship between various stereo isomers of the compounds. Those words are diastereomers and mesomers. A. Positional isomersB. Gemetrical isomerC. IdenticalD. Chain isomers |
| Answer» Correct Answer - 2 | |
| 323. |
Which of the following has zero dipole moment?A. cis-2-butaneB. trans-2-buteneC. 1-buteneD. 2-methyl-1-propence |
| Answer» Correct Answer - 2 | |
| 324. |
n-Butanol and 2-methyl propanol are a pair of which isomers?A. PositionB. FunctionalC. MetamersD. Chain |
| Answer» Correct Answer - 4 | |
| 325. |
Number of possible monochloro benzenes isA. 1B. 3C. 5D. 6 |
| Answer» Correct Answer - 1 | |
| 326. |
Carboxylic acids and esters areA. Functional isomersB. Keto-enol-tautomersC. Geometriacal isomersD. Not isomers at all |
| Answer» Correct Answer - 1 | |
| 327. |
Meso-tartaric acid is optically inactive due to the presence ofA. Molecular symmetryB. Molecular asymmetryC. External compensationD. Two asymmetric atoms |
| Answer» Correct Answer - 1 | |
| 328. |
Optical inactivity of meso isomers is due toA. element of symmetry and element of asymmetryB. internal compensationC. due to lack of asymmetric carbonD. External compensation |
| Answer» Correct Answer - 2 | |
| 329. |
The instrument used for measuring specific rotation isA. SpectrometerB. PolarimeterC. LactometerD. Ammeter |
| Answer» Correct Answer - 2 | |
| 330. |
Assertion (A): Pent -1-ene and `2`-methyl but 1- ene are position isomers Reason (R ): Position isomers have the same molecular formula but differ in the position of functional group.A. Statement 1 is true, statement 2 is true, statement 2 is a correct explanation for statement 3B. Statement 1 is true, statement 2 is true, statement 2 is not a correct explanation for statement 3C. Statement 1 is true, statement 2 is falseD. Statement 1 is false, statement 2 is true |
|
Answer» Correct Answer - D Statement-1 is false. They are not position isomers, since the position of the double bond has not changed, they are chain isomers Statement -2 is true. |
|
| 331. |
How many compound are stable after deprotonation ? |
|
Answer» Correct Answer - 3 (a,c,f) Compound which gives an stable conjugate base deprotonation will deprotonate easily. |
|
| 332. |
How many methyl group are present in 2, 5-dimethyl-4-ethylheptaneA. 2B. 3C. 4D. 5 |
|
Answer» Correct Answer - D `underset("2,5-dimethyl 4-ethylheptane(5-Metyl group)")(H-underset(H)underset(|7)overset(H)overset(|)(C)-underset(H)underset(|6)overset(H)overset(|)(C)-underset(CH_(3))underset(|5)overset(H)overset(|)(C)-underset(H)underset(|4)overset(CH_(2)CH_(3))overset(|)(C)-underset(H)underset(|3)overset(H)overset(|)(C)-underset(H)underset(|2)overset(CH_(3))overset(|)(C)-underset(H)underset(1|)overset(H)overset(|)(C)-H)` |
|
| 333. |
The compound which would give the most stable carbcation on dehydration is :A. `CH_(3)-underset(CH_(3))underset(|)(CH)-CH_(2)OH`B. `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-OH`C. `CH_3 - CH_2 - CH_2 - CH_2 OH`D. `CH_(3)-overset(OH)overset(|)(CH)-CH_(2)-CH_(3)` |
|
Answer» Correct Answer - B (b) `3^@ C^(oplus)` is more stable. |
|
| 334. |
Give the correct order of magnitude of heat of hydrogenation of the following : ltbr. A. `IltIVltIIIltII`B. `IVltIIIltIltII`C. `IVltIltIIIltII`D. `IVltIltIIltIII` |
| Answer» Correct Answer - C | |
| 335. |
At normal temprature ,X and Y A. Resonance structuresB. tautomersC. functional isomersD. positional isomers |
| Answer» Correct Answer - B | |
| 336. |
The most stable carbocation is:A. `CH_(3)overset(+)CH_(2)`B. `overset(+)CH_(3)`C. `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C+`D. `CH_(3)-underset(CH_(3))underset(|)overset(+)CH` |
|
Answer» Correct Answer - C Due to inductive effect and hyperconjugation effect of methyl groups, the order of stability of carbocation is `3^(@)R^(+) gt 2^(@)R^(+) gt 1^(@)R^(+) gt overset^(+)CH_(3)` `(CH_(3))_(3)overset(+)C`, being a `3^@` carbocations, is the most stable. |
|
| 337. |
Which of the following alkyl group has the maximum `+I` effect ?A. `(CH_(3))_(2)CH-`B. `(CH_(3))_(3)C-`C. `CH_(3)CH_(2)-`D. `CH_(3)CH_(2)-` |
| Answer» Correct Answer - B | |
| 338. |
Which of the following group shows `+l-` effect :A. `-Br`B. `-COOH`C. `-OR`D. `-COO^(-)` |
| Answer» Correct Answer - D | |
| 339. |
Which one of the following is most acidicA. p-nitrophenolB. phenolC. m-nitrophenolD. o-nitrophenol |
| Answer» Correct Answer - A | |
| 340. |
Consider the following carbocation- (a). `CH_(3)-overset(o+)(C)H_(2)` (b). `CH_(2)=overset(o+)(C)H` (c). `CH_(2)=CH-overset(o+)(C)H_(2)` (d). `C_(6)H_(5)-Coverset(o+)(H)_(2)`A. `dgtcgtagtb`B. `dgtcgtbgta`C. `cgtdgtbgta`D. `cgtdgtagtb` |
| Answer» Correct Answer - A | |
| 341. |
Consider the following carbocation: (i) `Cl_(3)overset(+)C` (ii) `Cl_(2)overset(+)CH` , (iii) `Cloverset(+)CH_(2)` , (iv) `overset(+)CH_(3)`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 (iii) lt (ii) lt (i)` |
|
Answer» Correct Answer - B The `Cl` atom destabilizes the carbocation by intensiying the positive charge on `C` atom through its negative inductive effect. Thus, stability increase with decrease in the number of `Cl` atoms. |
|
| 342. |
Select correct statement about l effect ?A. l effect transfers electrons from one carbon atom to another.B. l effect is the polarisation of `sigma` bond electronsC. l effect creates net charge in the molecule.D. l effect is distance independent. |
| Answer» Correct Answer - B | |
| 343. |
The correct stability order of the given conanical structures is :A. `IgtIIgtIII`B. `IIIgtIgtII`C. `IgtIIIgtII`D. `IIgtIIgtI` |
|
Answer» Correct Answer - B Strucuture III & I has complete octet for all atomws but II is more stable than I because `N^(o+)gtO^(o+)` is the stability order. |
|
| 344. |
In the following compounds, the order of basicity is :A. `IVgtIgtIIIgtII`B. `IIIgtIgtIVgtII`C. `IIgtIgtIIIgtIV`D. `IgtIIIgtIIgtIV` |
| Answer» Correct Answer - D | |
| 345. |
In which case the `sigma` bond pair and `pi` bond pair of electrons both are attracted in the same direction (towards same atom):A. `H_(2)C=CH-Cl`B. `CH_(3)-CH_(2)-NH_(2)`C. `H_(2)C=CH-CH=O`D. `H_(2)C=CH-OCH_(3)` |
| Answer» Correct Answer - C | |
| 346. |
Which of the following is correct about the following compound A. All the `C-C` bond length are sameB. `C_(1)-C_(2)` bond length is shorter than `C_(2)-C_(3)` bond lengthC. `C_(1)-C_(2)` bond length is greater than `C_(2)-C_(3)` bond lengthD. All the `C-C` bond length are equal to `C-C` bond length of benzene |
| Answer» Correct Answer - B | |
| 347. |
The correct order of acidity of the following is : A. `IIIltIVltIltII`B. `IIIltIVltIIltI`C. `IVltIIIltIltII`D. none of these |
| Answer» Correct Answer - B | |
| 348. |
For the given compounds the correct order of resonance energy is :A. `IIIgtIgtII`B. `IIgtIgtIII`C. `IgtIIgtIII`D. `IIIgtIIgtI` |
|
Answer» Correct Answer - C Resonance energy of extended conjugation is more. |
|
| 349. |
In which of the following compounds the hydroxuylic protion is most acidic ?A. B. C. D. |
|
Answer» Correct Answer - D `-I` power of `-F1` is maximum in (d) |
|
| 350. |
In which of the following molecules `pi`-electron density in ring is minimum :A. B. C. D. |
| Answer» Correct Answer - D | |