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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.
| 201. |
`overset(HNO_(3) + H_(2)SO_(4)) to ` Product , product of this reaction will be :A. B. C. D. |
| Answer» Correct Answer - D | |
| 202. |
Find out missing reagent Y :A. `Sn +HCl`B. `Li + HCl`C. `C + CCl_(4)`D. `Na + Ether` |
| Answer» Correct Answer - A | |
| 203. |
`overset(Br_(2) + Fe)to Z`, Identify Z:A. B. C. D. |
| Answer» Correct Answer - A | |
| 204. |
The action of `Br_(2)//H_(2)O` on salicylic acid results in the formation of :A. B. C. D. |
| Answer» Correct Answer - B | |
| 205. |
Indentify the reagents in the following transformations : A. `"alc. KOH and "H_(2)O,HgSO_(4), H_(2)SO_(4)`B. `"alc. KOH and "KMmO_(4)//H^(+)`C. `NaNH_(2)" and "H_(2)O,HgSO_(4),H_(2)SO_(4)`D. `NaNH_(2)" and " KMnO_(4)//H^(+)` |
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Answer» Correct Answer - c |
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| 206. |
overset(Br_(2))toP , P` is:A. B. C. D. none the these |
| Answer» Correct Answer - B | |
| 207. |
Consider the following structure of formula `C_(6)H_(6)` `underset(I)(HC-=C CH_(2)CH_(2)C-=CH)` `underset(II)(HC-=C-CH_(2)-C-=C-CH_(3))` `underset(III)(C-=C-C-=C-CH_(2)CH_(3))` Five isomeric disubsitution products are theoretically posible fromA. III,IV,VB. I,II,IIIC. II,III,IVD. I,III,V |
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Answer» Correct Answer - A (I). Five, (II) five, (III) five, (IV) two, and (V) (four). |
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| 208. |
underset("(ii) NaOH")overset((i) SO_(3)+ H_(2)SO_(4))toP(68 % yeild ) : P `i s:A. B. C. D. none the these |
| Answer» Correct Answer - C | |
| 209. |
+underset(" 1 mole")CH_(3)ONa to P ("major") , P` isA. B. C. D. none the these |
| Answer» Correct Answer - B | |
| 210. |
Benzyl choride can be perpared by reacting :A. Toluen with `Cl_(2)` in the presence of `FeCl_(3)`B. Benzene with `CH_(3)Cl` in the presence of `AlCl_(3)`C. Toluen with `Cl_(3)` in the presence of sulightD. Benzene with `Cl_(2)` in the presence of `FeCl_(3)` |
| Answer» Correct Answer - C | |
| 211. |
Benzne can be obtained by heating either benzoic acid with X or phenol with Y.X and Y, respectively areA. Zincdust and sodalimeB. sodalime and zincdustC. zincdust and sodium hydroxideD. sodalime and copper |
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Answer» Correct Answer - B `C_(6)H_(5)COOH+NaOHunderset(Delta)overset(CaO)toC_(6)H_(6)+Na_(2)CO_(3)` `C_(6)H_(5)OH+Znoverset(Delta)toC_(6)H_(6)+ZnO` |
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| 212. |
Which of the following compounds will show sromatic character?A. I,II and IIIB. II and IIIC. II,IVD. I,II,III and IV |
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Answer» Correct Answer - C Only II and IV possess `(4n+2)pie^(-)`s which are completely delocalized Note that in compound IV, the lonepair on O atom is also involved in the delocalized `pie^(-)` cloud. |
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| 213. |
Toluene reacts with halogen in presence of iron (III) chloride giving ortho and para-halo compounds. The reaction is :A. free redical addition reactionB. electrophilic elimination reactionC. nucleophilic substitution reactionD. electrophilic substitution reaction |
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Answer» Correct Answer - d |
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| 214. |
Which one of the following compounds give only one isomer upon nitration ?A. B. C. D. |
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Answer» Correct Answer - d |
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| 215. |
Which of the following are less arective than benzene ?A. TolueneB. ChlorobenzeneC. NitrobenzeneD. benzoic acid |
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Answer» Correct Answer - `(b,c,d)` |
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| 216. |
The type of substituion reactions of benzenoid hyderocarbons are :A. eleminationB. electrophilicC. nuclephilicD. free radical |
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Answer» Correct Answer - `(b,c,d)` |
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| 217. |
Benzene reacts with `CH_(3)Cl` in the presence of anyhydrous `AlCl_(3)` to formA. chlorobenzeneB. benzene hexachlorideC. hexachlorobenzeneD. none of these |
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Answer» Correct Answer - a |
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| 218. |
For a typical nucleophilic aromatic subsitution reaction to take place. (1) Nucleophilic atom should be of oxygen, nitrogen or sulphur. (2) Leaving group should be halide . (3) There should be strong electron withdarwing at ortho and para position to leaving group. Fastest nucleophilic aromatic substitution reaction take place in :A. B. C. D. |
| Answer» Correct Answer - A | |
| 219. |
The strongest ortho/para and the strongest meta directing groups, respectively, areA. `-NO_(2)` and `NH_(2)`B. `-CONH_(2)` and `NH_(2)`C. `-NH_(2)` and `CONH_(2)`D. `-NH_(2)` and `-NO_(2)` |
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Answer» Correct Answer - D `-overset(..)(N)H_(2)` is one of the strongest and has powerful ortho/para directing effect while `-NO_(2)` is one of the strongest deactivator and has powerful meta directing influence. |
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| 220. |
Among the following, the aromatic compound isA. B. C. D. |
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Answer» Correct Answer - A Species (1) is called cyclopropenyl cation. It is planar and has `(4n+2)pie^(-)`s. thus it is aromatic. |
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| 221. |
How many isomers are possible when three hydrogen atoms in the benzene ring are replaced by three same substituent groups ? |
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Answer» Correct Answer - Three : (1, 2, 3), (1, 2, 4) and (1, 3, 5) `(##GRB_ORG_CHM_P1_C08_E01_015_S01##)` |
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| 222. |
In the electrophilic substituion of benzene ring, the second substituent is directed by the group already present. Electron releasing groups (+I and +M) are ortho-para-directing and activating, whreas the electron withdrawing groups (-I and -M) are meta-directing and deactivating. Halogens are placed under the category of +T (Tautomeric) groups because they have -Ibdyctuve abd +Mesomeric effect. These groups are deactivating but ortho-para-directing. In the introduction of third group to the benzene ring, the product of minimum steric gindrance is formed. Answer the follwing questions : Ortho-Xylene on mono nitration givesA. two productsB. three productsC. one productsD. four products |
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Answer» Correct Answer - a |
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| 223. |
Which does not show substituion in benzene ring ?A. `CIDO_(3)H`B. `"Conc." H_(2)SO_(4)" on heating"`C. Conc. HCID. `CH_(3)CI//AICI_(3)` |
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Answer» Correct Answer - c |
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| 224. |
Eaxmine the structural formula shown below and find out how many compounds will show oxidation reaction with acidic `KMnO_(4)` |
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Answer» Correct Answer - 4 |
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| 225. |
The compound formed as a result of oxidation of ethyl benzene by `KMnO_(4)` isA. benzylalcoholB. enzophenoneC. acetophenoneD. benzoic acid |
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Answer» Correct Answer - d |
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| 226. |
Oxidation of naphthalene by acidic `KMnO_(4)` gives :A. tolueneB. benzoic acidC. benzaldehydeD. phthalic acid |
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Answer» Correct Answer - d |
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| 227. |
Which of the following does not undergo the Friedel-Crafts alkylation reaction?A. B. C. D. |
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Answer» Correct Answer - b |
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| 228. |
Which of the following does not undergo the Friedel-Crafts alkylation reaction?A. AnilineB. PhenolC. NitrobenzeneD. all of these |
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Answer» Correct Answer - `(a,c)` |
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| 229. |
Match the following : `{:("Clumn I","Column II"),("(a) Oxidation of naphthalene","(p) Benzaldehyde"),("(b) Acylation of benzene","(q) Acetophenone"),("(c) Oxidation of toluene","(r) Benzoic acid"),("(d) Ozonolysis of styrene","(s) Phthalic acid"),(" ","(t) Formaldehyde"):}` |
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Answer» Correct Answer - `(a-s); (b-q); (c-p,r); (d-p,t)` |
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| 230. |
Which of the following structure most closely respresent as intermedite in the electrophilic brominatin of para -xylene ?A. B. C. D. |
| Answer» Correct Answer - C | |
| 231. |
Which of the following compounds forms ortho-benzenedicarboxylic acid when oxidized by hot aqueous potassium permanganate ?A. B. C. D. |
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Answer» Correct Answer - b |
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| 232. |
In sulphonation, acylation and formyaltion of benzene the group of electrophilies would be :A. `SO_(3)^(o+) CH_(3) - C -= overset(o+)O, HCoverset(o+)O`B. `overset(o+) SO_(3) H, CH_(3) CO, HCO`C. `SO_(3)^(o+) CH_(3) - C -= overset(o+)O, HCoverset(o+)O`D. `overset(o+) SO_(3) CH_(3), CHO, CO+ HCl` |
| Answer» Correct Answer - C | |
| 233. |
In the sulphonation, acetylation and formlylation of benzene the group of effective electronphiles would be ? (X)A. `SO_(3)^(+),CH_(3)C-=overset(+)(O),Hoverset(+)(C)O`B. `SO_(3),CH_(3)-C-=overset(+)(O),Hoverset(+)(C )O`C. `SO_(3),CH_(3)CHO,CO+HCI`D. `HSO_(3,CH_(3)CO,HCO` |
| Answer» Correct Answer - B | |
| 234. |
The electrophile in the sulphonation of arenes isA. `SO_(3)`B. `overset(+)(S)O_(3)`C. `Hoverset(+)(S)O_(3)`D. `HSO_(3)` |
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Answer» Correct Answer - 1 The electrophile is sulphur trioxide `(SO_(3))` generated in the following manner. (i) From sulphuric acid. `2H_(2)SO_(4)toH_(3)O^(+)+HSO_(4)^(-)+SO_(3)` (ii) From pyrosulphuric acid, often called fuming sulphuric acid: `H_(2)S_(2)O_(7) or HOSO_(2)OSO_(2)OHtoH^(+)+HSO_(4)^(-)+SO_(3)` In both the cases `HOSO_(2)O^(-)` acts as a base in the second step. |
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| 235. |
In the sulphonation of benzene, the active electrophilic species isA. `SO_(3)`B. `SO_(2)`C. `SO_(4)^(2-)`D. `HSO_(4)^(2-)` |
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Answer» Correct Answer - A `2H_(2)SO_(4)toH_(3)O^(+)+HSO_(4)^(-)+SO_(3)` |
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| 236. |
1, 4-Dimethyl benzene on heating with anhydrous `AICI_(3)" and "HCI` produces :A. 1,2-dimethylbenzeneB. 1, 3-dimethylbenzeneC. 1,2, 3-trimethylbenzeneD. ethylbenzene |
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Answer» Correct Answer - a |
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| 237. |
What products are formed when m-xylene is treated with `Br_(2)` in the presence of `FeBr_(3)` ? A. B. C. D. |
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Answer» Correct Answer - b |
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| 238. |
Which of the follwonig compounds from ortho- benzenedicarboxiylic acid when oxidized by hot aqueous `KMnO_(4)` ?A. B. C. D. |
| Answer» Correct Answer - B | |
| 239. |
Which of the following is the major produced from the sulphonation of `alpha`- tetralone ? A. B. C. D. |
| Answer» Correct Answer - C | |
| 240. |
(A) Benzene on heating conc. `H_(2)SO_(4)` gives benzene sulphonic acid which heated with supherheated stem under pressure gives benzene. ( R) suplhonation is a reversible precess.A. If both (A) and ( R) are correct and ( R) is corrct explanation of (A).B. If both (A) and ( R) are correct but ( R) is not the corrct explanation of (A).C. If (A) is incorrect but ( R) is incorrect.D. If (A) is incorrect but ( R) is incorrect. |
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Answer» Correct Answer - a |
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| 241. |
Toluene, when treated with `Br_(2)//Fe` gives p-bromotoluene as the major product, because the `CH_(3)` group:A. is para-directingB. is meta-directingC. activates the ring by hyperconjugationD. deactivates the ring |
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Answer» Correct Answer - `(a,c)` |
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| 242. |
Electrophilic bromination of p- toluene sulphonic acid, followed by heat with 50% `H_(2)SO_(4)` produces orhto-bromotoluenc . Which of the following intermediate lends to this product ?A. B. C. D. |
| Answer» Correct Answer - C | |
| 243. |
When of the following compounds react slower than benzene in electrophilic bromination ?A. `C_(6)H_(5)CH_(3)`B. `C_(6)H_(5)OH`C. `C_(6)H_(5)NO_(2)`D. `C_(6)H_(5)NH_(2)` |
| Answer» Correct Answer - C | |
| 244. |
Aromatic hydrocarbon can show electrophilic substitution reaction, oxidation and acidic nature. If alkyl group attached to benzene ring has `alpha-H` atom, it is oxidiesd into-COOH group. The electrophilic sustittion in aromatic compounds takes The at the position where most stable `sigma` complex is formed : the product formed is/are:A. B. C. D. Both (a) and (b) |
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Answer» Correct Answer - b |
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| 245. |
Which of the following are supposed to produce to produce toluene ?A. B. C. D. |
| Answer» Correct Answer - A::C::D | |
| 246. |
Which of the following reactions will produce benzene ?A. B. C. D. |
| Answer» Correct Answer - A::B::C | |
| 247. |
What function does `HNO_(3)` serve in the reaction of benzene with `I_(2)` to produce iodobenzene ?A. The `HNO_(3)` convrert the `overset(o+)I` to `I_(2)`B. `HnO_(3)` serve as catalystC. `HNO_(3)` convert `I_(2)` to HID. `HNO_(3)` convert `I_(2)` to `overset(o+) I` |
| Answer» Correct Answer - D | |
| 248. |
Which of the following compounds reacts slower than benzene in electrophilic bromination in the benzene ring?A. `C_(6)H_(5)NO_(2)`B. `C_(6)H_(5)CH_(3)`C. `C_(6)H_(5)OH`D. `C_(6)H_(5)CH_(3)` |
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Answer» Correct Answer - A the `-NO_(2)` group is strongly deactivating `-NH_(2)` and `-OH` groups are strongly activating and `-CH_(3)` group is weakly activating. |
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| 249. |
Which of the following reactions will produce `RCOAr` in good yield?A. `ArCOCl+R-Hoverset(AlCl_(3))to`B. `Ar-H+RCOCloverset(AlCl_(3))to`C. `ArCOCl+RMgXto`D. `ArMgX+RCOCl` |
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Answer» Correct Answer - B The fiedel-crafts acylation reaction is an effective means of introducing an acyl group into an aromatic ring and in one of the best methods to make aromatic ketons `R - overset(O)overset(||)(C )-Ar` |
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| 250. |
In the given reaction, The product (P) is :A. B. C. D. |
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Answer» Correct Answer - c |
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