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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.
| 301. |
What single isomer would be found in greatest yield when isopropyl chloride undergoes a Friedel-Crafts alkylation with t-butylbenzene ?A. p-isopropyl-t-butylbenzeneB. m-isopropyl-t-butylbenzeneC. o-isopropyl-t-butylbenzeneD. none of these |
| Answer» Correct Answer - A | |
| 302. |
Can the amino group, in the aniline molecule, become meta-directing in an electrophilic substitution reaction ?A. No, it never shows meta directing properties.B. Yes, in a strongly acidic mediumC. Yes, in a strongly alkaline mediumD. Yes, in a non-polar solvent |
| Answer» Correct Answer - B | |
| 303. |
Among the compounds given, the one that would form a brilliant colored dye to on treatment with `NaNO_(2)` in dilute HCl followed by addition to an alkaline solution of `beta`-napthol is:A. B. C. D. |
| Answer» Correct Answer - C | |
| 304. |
How many toluidines on reaction with `NaNO_(2)//HCl` followed by `H_(3)PO_(2)` treatment gives Toluene. |
| Answer» Correct Answer - C | |
| 305. |
When aniline reacts with `HNO_(2)(NaNO_(2))+HCl)` diazonium chloride is formed which on reaction with `H_(3)PO_(2)` gives:A. `CH-=CH`B. `C_(6)H_(6)`C. `CH_(2)==CH_(2)`D. `CH_(3)-CH_(3)` |
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Answer» Correct Answer - B `PhN_(2)^(oplus)C,_(2)overset(H_(3)PO_(2).Delta)toC_(6)H_(6)` |
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| 306. |
A positive cabylamine test is not given byA. N, N-dimethylanilineB. 2,4-DimethylanilineC. 2-Methyl-4-ethylanilineD. p-Methylbenzyl amine |
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Answer» Correct Answer - A `2^(@)` & `3^(@)` amine does not give carbyl amine test. |
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| 307. |
`C_(6)H_(5)NH_(2)+C_(6)H_(5)COCl rarr C_(6)H_(5)NHCOC_(6)H_(6)+HCl`. This reaction is calledA. Schotten Baumann reactionB. Perkin reactionC. Schmidt reactionD. Claisen reaction |
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Answer» Correct Answer - A This reaction is known as Schotten Baumann reaction. |
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| 308. |
A positive carbylamine test is not given by:A. N, N-dimethylanilineB. 2,4-DimethylanilineC. 2-Methyl-4-ethylanilineD. p-Methylbenzyl amine |
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Answer» Correct Answer - A `2^(@)` and `3^(@)` amine does not give carbyl amine test. |
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| 309. |
Bottles containing `C_(6)H_(5)I` and `C_(6)H_(5)-CH_(2)I` lost their original lables. They were labelled A and B for festing. A and B were separately taken in a test tube and boiled with `NaOH` solution. The end solution in each tube was made acidic with dilute `HNO_(3)` and then some `AgNO_(3)` solution was added. Substance B gave a yellow precipitate. Which one of the following statements is true for this experiment.A. Addition of `HNO_(3)` was unnecessaryB. `(A)` was `PhI`C. `(A)` was `PhCH_(2)I`D. `(B)` was `Phl` |
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Answer» Correct Answer - `b` Aryl halide, due to resonance does not give test for halide ion, whereas benzyl halides give due to the formation of benzyl `C^(o+)` which gives benzyl alcohol and `I^(theta)`. `Ph I + Aq. NOH rarr "No reaction"` `PhCH_(2)I + Aq. NaOH rarr PhCH_(2) OH + underset(("yellow ppt."))underset(AgI)underset(darr AgNO_(3))underset(l)(I^(theta)` |
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| 310. |
The labelled carbon goes with :A. `Ph - overset(14)(CO_(2)) H`B. `overset(14)CO_(2)`C. `Ph - overset(14)(CH_(2)) - CO_(2)H`D. `overset(14)(CH_(4))` |
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Answer» Correct Answer - B `Ph - CO_(2)H, overset(14)(CO_(2))` |
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| 311. |
When comparing the hydrogenation of benzene with that of a hypothetical 1, 3 5-cyclohexatriene, benzene _____ than the cyclohexatriene.A. absorbs 152kJ/mol more heatB. gives off 152kJ/mol more heatC. absorbs 152kJ/mol less heatD. gives off 152kJ/mol less heat |
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Answer» Correct Answer - D Benzene is aromatic therefore gives off 152 kJ/mol more heat |
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| 312. |
Suggest the best reaction conditions for the synthesis shown below. A. (1) `HNO_(3), H_(2)SO_(2)`, then (2) `Br_(2)`B. (1) `Br_(2)`, then (2) `HNO_(3), H_(2)SO_(2)`C. (1) `CH_(3) Br, AlBr_(3)`, then (2) `HNO_(3) , H_(2)SO_(3)`D. `HNO_(3), H_(2)SO_(2)`, then (2) `Br_(2), FeBr_(3)` |
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Answer» Correct Answer - D Nitration following bromination. |
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| 313. |
Hydrogenation of naphthalene (P) with excess hydrogen gas stops cleanly at 1, 2, 3, 4-tetrahydronaphalene (Q). What conclusion can be drawn from this experiment ? A. the hydrogenation of P is exothermicB. one aromatic ring of P is more reactive than the aromatic ring of QC. one aromatic ring of P is less reactive than the other ring of QD. reduction of the first `C = C` of P is faster than reduction of the second or third `C = C` |
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Answer» Correct Answer - B Annelation effect. |
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| 314. |
The step shown below is a recent synthesis of corannulene Product (A) is :A. B. C. D. |
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Answer» Correct Answer - A `Pd//C` (or) Se is used to aromatize the acyclic ring. |
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| 315. |
In the reaction given below, the major product formed is: A. B. C. D. |
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Answer» Correct Answer - D More activated ring undergo electrophilic aromatic substitution. |
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| 316. |
Which of the following molecules is expected to have the greatest resonance stabilization ?A. B. C. D. |
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Answer» Correct Answer - B Both ring will be aromatic after `pi-` bond breaking. |
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| 317. |
. The major product obtained isA. B. C. D. |
| Answer» Correct Answer - B | |
| 318. |
Identify molecular weight of final product (Y). |
| Answer» Correct Answer - 75 | |
| 319. |
The structure of the final product (Y) formed in the following sequence is: A. B. C. D. |
| Answer» Correct Answer - C | |
| 320. |
Identify the major product (B).A. B. C. D. |
| Answer» Correct Answer - B | |
| 321. |
Which reaction sequence would be best to prepare 3-chloro-aniline form benzeneA. nitration, reducing, chlorinationB. chlorination, nitration, reductionC. nitration, chlorination, reductionD. nitration, reduction, acetylation, chlorination, hydrolysis |
| Answer» Correct Answer - C | |
| 322. |
An orgainc compound having the molecular formula `C_(8)H_(10)O` on being heated with `I_(2)` and dilute `NaOH` gives a yellow precipitate. The expected compound is :A. `C_(6)H_(5)CH_(2)CH_(2)OH`B. C. D. |
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Answer» Correct Answer - D `Ph - overset(OH)overset(|)(CH) - CH_(3) underset("Oxidation")overset(NaOI)rarr Ph - overset(O)overset(||)(C) - CH_(3) underset("Haloform")overset(I_(2)+NaOH)rarr Ph - CO_(2)^(Θ) + CHI_(3) darr` |
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| 323. |
Consider the following sequence of reactions. `C_(6)H_(6) + CH_(3) CH = CH_(2) underset("heat")overset(H_(3)PO_(4))rarrA underset(2. H_(3)O^(+))overset(1. O_(2), "heat")rarr B + C` The products (B) and (C) are:A. benzaldehyde and acetaldehydeB. benzoic acid and acetic acidC. phenol and propionadehydeD. phenol and acetone |
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Answer» Correct Answer - D Industrial method for preparation for phenol which is known as cumen-hydoperoxide rearrangement. |
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| 324. |
The energy of activation is lowest for which reaction?A. `RCH_(2) O^(o+)H_(2) rarr R C^(o+)H_(2)`B. `R_(2)CHO^(o+)H_(2) rarr R_(2)C^(o+)H`C. `R_(3)C - O^(o+)H_(2) rarr R_(3)C^(o+)`D. All have the same energy of activation. |
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Answer» Correct Answer - `c` `3^(@) C^(o+)` is more stable and hence has less `E_("activation")` |
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| 325. |
Which of the following has the lowest heat of combustion ?A. B. C. D. |
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Answer» Correct Answer - C Aromatic are stable `:.` less heat of combustion |
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| 326. |
The product obtained from the reaction is: A. B. C. D. |
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Answer» Correct Answer - A Because of double bond character in carbon-bromine it will not undergo `S_(N^(2))`. |
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| 327. |
How many benzyic hydrogens are present in the hydrocarbon shown below ? A. 3B. 4C. 5D. 6 |
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Answer» Correct Answer - C `5 alpha -` hydrogen is benzylic hydrogen in this compound |
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| 328. |
The major product formed in the reaction is: A. B. C. D. |
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Answer» Correct Answer - B Hyperconjugation `rarr` more `alpha`H, more reactive o, p site |
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| 329. |
Sulphonation is most favourable at the carbon number...A. 1B. 2C. 3D. 4 |
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Answer» Correct Answer - B Reaction take place with reapect to `(+M)` of `- NHCOCH_(3)` than `CH_(3)` of `NH = overset(O)overset(||)(C) - CH_(3)`, less steric hindered will dominatory |
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| 330. |
Increasing order of equilibrium constant for the formation of a hydrate is: (i) A. `i lt ii lt iii lt iv`B. `iv lt ii lt i lt iii`C. `ii lt iv lt iii lt i`D. `iv lt ii lt iii lt i` |
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Answer» Correct Answer - A `i rarr` least reactive since it ahs strong electron donating group that stabilize carbonyl group. `ii rarr` has electron donating group that indirectly stabilize the carbonyl carbon `iv rarr` has withdrawing group that destabilize the carbonyl carbon most reacative |
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| 331. |
The increasing order of diazotization of the following compound is : A. `(a) lt (b) lt (c) lt (d)`B. `(a) lt (d) lt (b) lt (c)`C. `(a) lt (d) lt (c) lt (b)`D. `(d) lt (c) lt (b) lt (a)` |
| Answer» Correct Answer - C | |
| 332. |
Product (B) in the above reactions is:A. B. C. D. |
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Answer» Correct Answer - B Intramolecular electrophilic aromatic substitution then nitration with respect to phenyl ring |
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| 333. |
Identify the position where E.A.S. can take place.A. 1B. 2C. 3D. 4 |
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Answer» Correct Answer - A More activated ring will undergo electrophilic attack |
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| 334. |
Phenol reacts with methyl chloroformate in the presence of `NaOH` to form product A. A reacts with `Br_(2)` to form product B. A and B are respectivelyA. B. C. D. |
| Answer» Correct Answer - N//A | |
| 335. |
The product formed by the reaction of acetamide with `Br_(2)` in presence of NaOH is:A. `CH_(3)CN`B. `CH_(3)CHO`C. `CH_(3)CH_(2)OH`D. `CH_(3)NH_(2)` |
| Answer» Correct Answer - D | |
| 336. |
Rank in order of increasing rate of reaction towards EAS with bromine in the presence of `FeBr_(3)`. (A) A. `B lt A lt C`B. `B lt C lt A`C. `A lt B lt C`D. `A lt C lt B` |
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Answer» Correct Answer - A `{:(C,gt,A,gt,B,),(+M,,+M,,-M,),(+H,,-M,,+H,):}` `+H =` hyperconjugation, `M =` Mesomeric effect. |
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| 337. |
The product formed by the reaction of acetamide with bromine in presence of `NaOH` isA. `CH_(3)CN`B. `CH_(3)OH`C. `CH_(3)CH_(2)OH`D. `CH_(3)NH_(2)` |
| Answer» Correct Answer - D | |
| 338. |
The products formed when a mixture of the following two amides( I and II) are treated with bromine and aqueous KOH are A. B. C. D. a mixture of all of these |
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Answer» Correct Answer - C It is Hofmann bromamide reaction. Hofmann reaction involves an intramolecular rearrangement. So, no cross products are formed even if we mix together two different amides in the reaction. |
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| 339. |
Sodium phenoxide when heated with `CO_(2)` under pressure at `125^(@) C` yield a product which on acetylation gives product `C` A. B. C. D. |
| Answer» Correct Answer - A | |
| 340. |
How would you synthesise 4-methoxyphenol from bromobenzene in not more than five steps? State clearly the reagents used in each step and show the structure of the intermediate compounds in your synthetic scheme. |
| Answer» Reagents are (1) NaOH/ high temperature and pressure (2) `Me_(2)SO-(4)` (3) conc. `H_(2)SO_(4)`, (4) Fusion with NaOH (5) `H_(3)O^(+)` | |
| 341. |
Which one of the following has the highest melting point ?A. PhenolB. Para-nitophenolC. Meta-NitrophenolD. ortho-Nitrophenol |
| Answer» Correct Answer - B | |
| 342. |
Which one of the following has the highest melting point ?A. PhenolB. para-NitrophenolC. meta - NitrophenolD. ortho-Nitrophenol |
| Answer» Correct Answer - B | |
| 343. |
The most appropriate reaction for the conversion of bromobenzene to benzoic acid isA. Reimer-Tiemann reactionB. Grignard reagentC. Claisen rearrangementD. Friedel-Crafts reaction |
| Answer» Correct Answer - B | |
| 344. |
p-bromoaniline is prepared from aniline viaA. direct bromination of aniline in presence of Lewis acidB. bromination of acetanilide followed by hydrolysisC. direct bronination of aniline in presence of lightD. amination of bromine. |
| Answer» Correct Answer - B | |
| 345. |
p-bromoaniline is prepared from aniline viaA. direct bromination of aniline in presence of Lewis acidB. bromination of acetanilide followed by hydrolysisC. direct bronination of aniline in presence of lightD. amination of bromine |
| Answer» Correct Answer - B | |
| 346. |
Reaction by which benzaldehyde cannot be prepared is :A. + `H_(2)` in presence of Pd -`BaSO_(4)`B. + CO + HCl in presence of anhydroud `AlCl_(3)`C. + Zn/Hg and conc. HClD. `+CrO_(2)Cl_(2)` in `CS_(2)` followed by `H_(3)O^(+)` |
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Answer» Correct Answer - C In (3) option the give reaction will not yield benzaldehyde. |
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| 347. |
Reaction by which benzaldehyde cannot be prepared is :A. B. C. D. |
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Answer» Correct Answer - C In (3) option the given reaction will not yield benzaldehyde. |
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| 348. |
The reaction of chloroform with alcoholic `KOH` and p- toluidine formsA. B. C. D. |
| Answer» Correct Answer - D | |
| 349. |
When primary aminereacts with chloroform in ehthanolic `KOH` then the product is .A. an isocyanideB. an aldehydeC. a cyanideD. an alcohol |
| Answer» Correct Answer - A | |
| 350. |
Assertion `(A)`: IN comparison to `C_(2) H_(5)Br`, it is difficult to carry out `SN` reaction o vinyl bromide. Reason `(R): Vinyl group is electron donating.A. Both `(A)` and `(R)` are true and `(R0` is the correct explanation of `(A)`.B. Both `(A)` and `(R)` are true but `(R)` is not the correct explanation of `(A)`.C. `(A) is true but `(R)` is false.D. `(A) is false but `(R)` is true. |
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Answer» Correct Answer - `c` Correct reason: `(C-X)` bond has some double bond character. |
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