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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. |
Which one of the following is not the correct order of boiling points of alkyl `//` aryl halides ?A. `CHCl_3gtCH_2Cl_2`B. `CH_3(CH_2)_3ClgtCH_3(CH_2)_2Cl`C. `(CH_3)_3CClgt(CH_3)_2CHCH_2Cl`D. `CH_3(CH_2)_3ClgtCH_2CH_2CHClCH_3` |
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Answer» Correct Answer - C `(CH_3)_3C Cl gt (CH_3)_2CHCH_2Cl` is not correct as boiling point of `(CH_3)_3 C Cl` is smaller than `(CH_3)_2CHCH_2Cl`. It is due to large surface area and shorter alkyl chain. |
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| 252. |
Debrominationof mesodibromobutane will give the product as :A. n-butaneB. 2-butyneC. cis-2-buteneD. trans-2-butene |
| Answer» Correct Answer - C | |
| 253. |
How will you convert methyl chloride to ethyl amine? |
| Answer» `underset("Methyl chloride")(CH_(3)Cl)overset(KCN)tounderset("Methyl cyanide")(CH_(3)C-=N)overset(H_(2)//Ni)tounderset("Ethyl amine")(CH_(3)CH_(2)NH_(2))` | |
| 254. |
Consider the following sequence of reaction `identify the structures of productsA. B. C. D. |
| Answer» Correct Answer - (1,3) | |
| 255. |
What happens when iodoform is heated with silver powder ? |
| Answer» `HCl_(3)+6Ag+HCl_(3)overset(heat)tounderset("Acetylene")(HC-=CH+6Agl` | |
| 256. |
What will be the end product (B) in the following sequence of reactions? A. 1,2- DibromobenzeneB. 1,3-DibromobenzeneC. 1,4-DibromobenzeneD. 1,2-Dibromobenzaldehyde |
| Answer» Correct Answer - B | |
| 257. |
Which of the following compounds will have highest melting point?A. ChlorobenzeneB. o-DichlorobenzeneC. m-DichlorobenzeneD. p-Dichlorobenzene |
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Answer» Correct Answer - D p-isomer is symmetrical hence closely packed due to which it shows higher melting point than o-and m-isomers. |
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| 258. |
At higher temperature, iodoform reaction is given by:A. `CH_(3)COOCH_(3)`B. `CH_(3)COOC_(2)H_(5)`C. `C_(6)H_(5)COOCH_(3)`D. `CH_(3)COOC_(6)H_(5)` |
| Answer» Correct Answer - B | |
| 259. |
Which of the following is an insecticide?A. DDTB. `CHCl_(3)`C. `CHI_(3)`D. `CF_(3)-CF_(3)` |
| Answer» Correct Answer - A | |
| 260. |
Electrophilic substitution in the following compound will be fastest at position `"............."`? A. 1B. 2C. 3D. 4 |
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Answer» Correct Answer - D Electrophilic substitution will be fastest at position due to hyperconjugation and + I effect of `-CH_(3)` group. |
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| 261. |
Which among the following has higher melting point A. I and IIB. IIIC. II and IIID. I |
| Answer» Correct Answer - B | |
| 262. |
Electrophilic substitution in the following compound will be fastest at position `"............."`? A. 1B. 2C. 3D. 4 |
| Answer» Correct Answer - D | |
| 263. |
The set of compounds in which the reactivity of halogen atom in the ascending order is .A. Chlorobenzene vinylchloride , chloroethaneB. chloroethane , chlorobenzene ,vinylchlorideC. vinylchloride , chlorobenzene, chloroetheneD. vinylchloride , chloroethane , chlorobenzene |
| Answer» Correct Answer - A | |
| 264. |
When phenyl magnesium bromide reacts with `t-butanol` the product would be :A. t-butylbenzeneB. phenolC. benzeneD. t-butyl phenyl ether |
| Answer» Correct Answer - C | |
| 265. |
A set of compounds in which the reactivity of halogen atom is in ascending order isA. chlorobenzene `lt` vinyl chloride `lt` ethyl chlorideB. ethyl chloride `lt` chlorobenzene `lt` vinyl chlorideC. vinyl chloride `lt` chlorobenzene `lt` ethyl chlorideD. vinyl chloride `lt` ethyl chloride `lt` chlorobenzene |
| Answer» Correct Answer - A | |
| 266. |
1-phenyl ehtene is reacted with HCl givesA. B. C. D. |
| Answer» Correct Answer - D | |
| 267. |
Following compound is reacted with HBr in the presence of peroxide gives A. B. C. D. |
| Answer» Correct Answer - C | |
| 268. |
In the following reaction stable reaction intermediate is A. B. C. D. |
| Answer» Correct Answer - A | |
| 269. |
In the folowing reaction first attacking species is A. `H^(*)`B. `H^(+)`C. `Br^(*)`D. `Br^(+)` |
| Answer» Correct Answer - C | |
| 270. |
Which of the following compounds can beclassified as aryl halides ?A. `p-ClC_(6)H_(4)CH_(2)CH(CH_(3))_(2)`B. `p-CH_(3)CHCl(C_(6)H_(4))CH_(2)CH_(3)`C. `o-BrH_(2)C-C_(6)H_(4)CH(CH_(3))CH_(2)CH_(3)`D. `C_(6)H_(5)-Cl` |
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Answer» Correct Answer - A::D (a,d) are both aryl halides. |
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| 271. |
Which of the following are secondary bromides ?A. `(CH_(3))_(2)CHBr`B. `(CH_(3))_(3)C CH_(2)Br`C. `CH_(3)CH(Br)CH_(2)CH_(3)`D. `(CH_(3))_(2)CBrCH_(2)CH_(3)` |
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Answer» Correct Answer - A::C (a,c) are both secondary dihalides. |
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| 272. |
Which of the following are secondary bromides ?A. `(CH_(3))_(2)CHBr`B. `(CH_(3))_(3)CCH_(2)Br`C. `CH_(3)CH(Br)CH_(2)CH_(3)`D. `(CH_(3))_(2)CBrCH_(2)CH_(3)` |
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Answer» Correct Answer - A::C `(a) H_(3)C-underset(CH_(3))underset(|)"CH"-Br` (b)`H_(3)C-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-CH_(2)Br` (c) `H_(3)C-underset(Br)underset(|)"CH"-CH_(2)-CH_(3)` (d) `H_(3)C-underset(CH_(3))underset(|)overset(Br)overset(|)C-CH_(2)CH_(3)` Secondary bromides are those compounds in which `alpha`-carbone (i.e, carbon bonded to bromine) is further bonded to two alkyl groups. In compound (a) and (c) `alpha`-carbon is bonded to two alkyl groups thats why it is secondary bromide but in compound (b) it is bonded to one alkyl group and it is primary bromide, In compound (c) it is bonded to three alkyl groups and it is tertiary alkyl halide. |
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| 273. |
2-Bromo-3,3- dimethylbutane on reaction with aqueous KOH yields X as the major product. X isA. 2,3,-trimethylpropan-1-olB. 2,2-dimethlbutan-3-olC. 2,3- dimethylbutan-2-olD. 2,2-dimethylpropan-2-ol |
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Answer» Correct Answer - C `{:(H_3C-underset(CH_3)underset(|)overset(CH_3)overset(|)C-underset(Br)underset(|)(CH)-CH_3overset(aq.KOH)toH_3C-overset(CH_3)overset(|)(CH)-underset(OH)underset(|)overset(CH_3)overset(|)C-CH_3),("2-Bromo-3,3-dimethylbutane"" ""2-3-Dimethylbutan-2-ol"):}` |
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| 274. |
The order of reactivity of various alkyl halides towards nucleophilic substitution follows the orderA. R-IgtR-BrgtR-ClgtR-FB. R-FgtR-ClgtR-BrgtR-IC. R-ClgtR-BrgtR-IgtR-FD. R-BrgtR-IgtR-ClgtR-F |
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Answer» Correct Answer - A The alkyl halides are very reactive due to highly polarised C-X bond with a large difference in electronegativities of carbon and halogen atoms. The order of reactiviy is iodides gt bromides gt chlorides gt fluorides. |
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| 275. |
Which of the following is most reactive towards aqueous NaOH?A. `C_6H_5Cl`B. `C_6H_5CH_2Cl`C. `C_6H_5Br`D. `BrC_6H_4Br` |
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Answer» Correct Answer - B Aromatic halides are less reactive than alkyl or aralkyl halides. Hence, `C_6H_5CH_2Cl` is the most reactive towards aq. NaOH. |
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| 276. |
In R-S configuration `-C-=N` group can be represented asA. `-C=N-C`B. `-overset(C) overset(|)(C)=N`C. ` underset(N)underset(|)(C)=N-C`D. `-underset(N)underset(|)overset(N)overset(|)C-underset(C)underset(|)N-C` |
| Answer» Correct Answer - D | |
| 277. |
Which of the following is used as insecticides gtA. `CHCl_(3)`B. `CHl_(3)`C. `CH_(2)Cl`D. `DDT` |
| Answer» Correct Answer - D | |
| 278. |
The reactivity order of alkyl halide is `3^(@) gt 2^(@) gt 1^(@)` inA. Both `S_(N)1` and `S_(N)2`B. Both `S_(N)2` and `E_(2)`C. Both `E_(2) " and " S_(N)2`D. Both `S_(N)1 " and " E_(2)` |
| Answer» Correct Answer - 4 | |
| 279. |
Assertion( A) The boiling points of alkyl halides decrease in the order `RI gt RBr gt RCl gt RF` Reason (R) The boiling points of alkyl chlorides, bromides and iodidesare considerably higher than that of the hydrocarbon of comparable molecular mass.A. Assertion and reason both are correct and reason is correct explanation of assertionB. Assertion and reason both are wrong statementsC. Assertion is correct but reason is wrong statementD. Assertion and reason both are correct statements but reason is not correct explanation of assertion |
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Answer» Correct Answer - D Assertion and reason both are correct statements but reason is not the correct explanation of assertion. For the same hydrocarbon part boiling point depends upon the atomic mass of halogen atom. Higher the mass of the halogen atom, higher will be the boiling point So, we can say that boiling point decreases with decrease in atomic mas of halogen atom. |
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| 280. |
Can ethanol be converted into iodoethane by heating with NaI and conc. `H_(2)SO_(4)`? |
| Answer» Correct Answer - No | |
| 281. |
When `2-`bromobutane reacts with alcoholic `KOH,` the reaction is calledA. halogenationB. hydrogenationC. chlorinationD. dehydrohalogenation |
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Answer» Correct Answer - D We know that when haloakanes are boiled with alcoholic solutionn of potassium hydroxide, halide (HX) resulting in formation of hydrogen halide (HX) resulting in formation of alkene. This reaction is called dehydro-halogenation. S |
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| 282. |
Aniline is obtained by reacting chlorobenzene withA. `NH_(3)`B. `NH_(4)`C. `NH_(4)Cl`D. `CH_(3)-NH_(2)` |
| Answer» Correct Answer - A | |
| 283. |
Chlorobenzene can be prepared by reacting aniline withA. `HCI " and " Cu_(2)CI_(2)`B. chlorine in presence of U.V. lightC. chlorine in presence of anhydrous `AICI_(3)`D. nitrous acid followed by heating with `Cu_(2)CI_(2)` |
| Answer» Correct Answer - D | |
| 284. |
What happen when Methylbromide is treated with sodium in presence of dry ether . |
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Answer» Methylbromide is treated with sodium in presence of dry ether forms ethane (wurtz reaction) `CH_(3) - Br + 2 Na + Br - CH_(3) overset("dry Ether")(to) CH_(3) - CH_(3) + 2 Na Br` |
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| 285. |
Explain why the alkyl halides though polar are immiscible with water . |
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Answer» Alkyl halides are polar but these do not dissolve in water i.e., immiscrible in nature . Reason : Among water molecules strong inter molecular hydrogen bonding is present . This hydrogen bond is difficult to be broken by alkyl halides . |
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| 286. |
Which of the following haloakane undergoes nucleophilic substitution reaction by `SN^(2)` mechanism onlyA. `CH_(3)Br`B. `CH_(3)CHBrCH_(3)`C. `C_(2)H_(5)CHBrCH_(3)`D. `(CH_(3))_(3)CBr` |
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Answer» Correct Answer - A In `SN^(2)` reaction, the reactivity of haloakane occurs in the order `CH_(3) gt 1^(@) gt 2^(@) gt 3^(@)`. The determining factor is steric hindrance in the caron atom of alkyl group attached to halogen atom. There is minimum steric hindrace offerex by teh hydrogenes to the approach of nucleophilie attacking at the carobon of C-Br bond. |
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| 287. |
In the following atom `1 Cl " " 2 F " " 3 Br " " 4 I` The order of leving group ability isA. `4 gt 3 gt 2 gt 1`B. `1 gt 2 gt 3 gt 4`C. `4 gt 1 gt 2 gt3`D. `4 gt 3 gt 1 gt 1` |
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Answer» Correct Answer - D Wekar the base greater the leaving group ability. `overset(OH^(-)) to CH_(2)-underset(OH) underset(|)(CH)-CH_(2)-Cl` |
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| 288. |
Preparation of lakyl halide in laboratory is least preferred by,A. direct halogenation of alkaneB. action fo `PX_(3) PX_(5)` on aloholC. addition of HX in alkeneD. action of `SOCl_(2)` on alcohol |
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Answer» Correct Answer - A In direction halogenation of alkane, dihalogen,trihalogen tetrahalogen derivatives are formed, hence it least preferred. |
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| 289. |
`C_(3) H_(8)+Br_(2) overset(AlBr_(3)) to A` (major product) `C_(2)H_(5)ONa+A to B`. What is B in above reaction ?A. `CH_(3)CH_(2)CH_(2)OC_(2)H_(5)`B. `CH_(3) CH=CH_(2)`C. `(CH_(3))_(2)CHOC_(2)H_(5)`D. all of the above |
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Answer» Correct Answer - B `CH_(3)H_(8)+Br to CH_(3)-CHBr-CH_(3)` `C_(2)H_(5)Ona+CH_(3)-CHBrCH_(3) to CH_(3)CH=CH_(2)` |
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| 290. |
Which of following compounds will give `1^(@)` alkyl halide and `3^(@)` alkyl halide on monohalogation ?A. pentaneB. 2-methyl propaneC. 2,3 dimethyl butaneD. n-butane |
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Answer» Correct Answer - C 2,3-dmethyl butane `CH_(3)-overset(CH_(3)) overset(|)(CH)-overset(CH_(3)) overset(|)(CH)-CH_(3)` It has `1^(@) H and 3^(@)H` on halogenation, gives, `1^(@)R-X and 3^(@)R-X` |
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| 291. |
The addition of HCl in propene proceeds viaA. `Cl^(+)` in first stpeB. `H^(+)` in first stepC. `H^(-)` in first stepD. `Cl^(+) and H^(+)` in single step |
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Answer» Correct Answer - B Since oxygen is more electronegative than cl, therefore, heterolytic of HO-Cl gives `HO^(-) and Cl^(+)`. Since alkene undergoes `E^(+) AR,` therefore the electrophilic `Cl^(+)` attack first to generate more stable carboncation, which then undergoes mcleophilic attack by `OH^(-)` to give propylene chlorohydrine `CH_(3)-CH=CH_(2)+Cl^(+) to CH_(3)- overset(o+)(CH)-CH_(2)Cl` |
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| 292. |
Conversation of `CH_(4)` to `CH_(3)CHl` is an example of which of the following reactions ?A. Free radical additionB. Free radical substitutionC. Nucleophilin substitutionD. electrophili substitution |
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Answer» Correct Answer - B We know that, `CH_(4)+Cl_(2) overset(U.V."light") to HCl+CH_(3)Cl`. In this reaction methane reacts with chlorine and the four hydrogen atoms of methane are successively replaced by chlorine atoms . This type of reaction is an example of free radical substitution. |
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| 293. |
Alkynes usually show which type of reaction ?A. AdditionB. SubstitutionC. EliminationD. none of these |
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Answer» Correct Answer - A We know that alkene is an unsturated hydrocarbn in which two carbon atoms are connected by a double bond. Therefore, it generally shows addtion reaction. |
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| 294. |
1-halobutane and 2-halobutane areA. chain isomersB. poistion isomersC. functional isomersD. metamers |
| Answer» Correct Answer - B | |
| 295. |
The reaction `CH_(4)Cl_(2) overset("U.V. light") to CH_(3)Cl+HCl` is an example ofA. addition reactionB. substitution reactionC. elimination reactionD. rrerrangmenet reaction |
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Answer» Correct Answer - B We know that in given reaction hydrogen atom of the methane molecule `(CH_(4))` is replaced by a chlorine atom. We also know the substitution reaction are those reaction in which an atom or grou of atom directly attached , to a carbon in the substrate moelcule,is preplaced by another atom or group of atoms. Therefore the given reaction is an example of subsitution reaction. |
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| 296. |
Halogenation of alanes isA. a reductive processB. on oxidative process.C. an isothermal processD. an indothermal process |
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Answer» Correct Answer - B We know that before halogenation, the electron pair constituting the C-H bond is almost due to samll difference in their electronegativity values. And after halogenation, the electorn pair of the C-H bond is near to the halogen atomm. Thus carbon atoms looses its some share in the electron pair and hence said to be oxidised. Therefore halogenation of alkanes is an oxidative process |
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| 297. |
In the reaction `C_(2)H_(5)CH=CH_(2)+HX to ` product. Wha is the product ?A. `C_(2)H_(5)CH_(3)`B. `C_(2)H_(5)CH_(2)-CH_(2)X`C. `C_(2)H_(5)-CHX-CH_(3)`D. `CH_(3)-CH_(2)X-CH=CH_(2)` |
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Answer» Correct Answer - C We know that, `CH_(2)CH_(2)+HBr to c_(2) H_(5)Br+H_(2)O` thus, ehtyl bromide `(C_(2)H_(5)Br)` is obtained by the action of hydrogen bromide (HBr) on ethanene. |
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| 298. |
Ethyl bromide can be obtained by the action of HBr onA. ethaneB. propeneC. etheneD. acetylene |
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Answer» Correct Answer - C We know that, `CH_(2)CH_(2)+HBr to C_(2) H_(5)Br+H_(2)O` thus, ethyl bromide `(C_(2)H_(5)Br)` is obtained by the action of hydrogen bromide (HBr) on ethanene. |
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| 299. |
Ethyl bromide can be obtained by the action of HBr onA. acetyleneB. propeneC. ethaneD. ethanol |
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Answer» Correct Answer - D we know that `C_(2)H_(5)OH+HBr to C_(2)H_(5) Br+H_(2)O`. Thus ethyl bromide `(C_(2)H_(5)Br)` is obtained by the action of hydrogen bromide (HBr) on ethanol. |
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| 300. |
Ethyl bromide can be converted into ethyl alcohol byA. heating with dilute hydrochloric acid and zincB. boiling with an alcoholic solution of KOHC. the action of moist silver oxideD. refluxing methanol |
| Answer» Correct Answer - C | |