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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.
| 151. |
Match List I (compound) with List II (use) and select the correct answer using the codes given below the lists `{:(" List I"," List II"),("I Acetyl salicylic acid","(a) Insecticide"),("II D.D.T.","(b) Drug"),("III Napthalene","(c) Moth repelling"),("IV Carbon tetrachloride","(d) Fire extinguisher"),(,"(e) Refrigerant"):}` Codes.A. I b, II a, III c, IV dB. I e, II c, III d, IV aC. I b, II c, III d, IV aD. I e, II a, III c, IV d |
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Answer» Correct Answer - A I (Acetyl salicylic acid)-b (Drug) II (D.D.T)-a (Insecticide) III (Naphthalene)-c (Moth repellent) IV (Carbon tetrachloride)-d (Fire extinguisher) |
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| 152. |
Ethylene reacts bromine to form-A. `Br-CH_(2)-CH_(3)`B. `CH_(3)CBr_(3)`C. `Br-CH_(2)-CH_(2)-Br`D. `CHBr_(3)` |
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Answer» Correct Answer - C `CH_(2)=CH_(2)+Br_(2)overset(C Cl_(2))rarr underset(Br)underset(|)(C )H_(2)-underset(Br)underset(|)(R )H_(2)` |
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| 153. |
Ethylene is obtained on electrolysing aqueous solution of :A. Pot. SuccinateB. Pot. FumarateC. Pot. AcetateD. Calcium carbide |
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Answer» Correct Answer - B `underset("Pot. Fumarate")({:(CHCOOK),("||"),(CHCOOK):})+2H_(2)O overset("Electrolysis")rarr underset("Ethyne")({:(CH),("|||"),(CH):})+2KOH+2CO_(2)+H_(2)` |
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| 154. |
Chlorofoem can be used in medicine asA. antipyreticB. antihistamineC. anaestheticD. antibiotic |
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Answer» Correct Answer - C Anaesthetic. |
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| 155. |
Commonly used moth repllent isA. P.D.C.B.B. D.D.T.C. B.H.C.D. E.D.B. |
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Answer» Correct Answer - A P.D.C.B (p-Dichlorobenzene) is a common moth repellent. |
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| 156. |
The technique of gas liquid chromatography is suitable for compounds which are:A. LiquidsB. Highly volatileC. Soluble in waterD. Vapourise ith decomposition |
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Answer» Correct Answer - D Vapourise without decomposition. |
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| 157. |
Which of the following structures does not contain any chiral C atom but represent the chirality in the structure ?A. 2-Ethyl-3-hexeneB. 2,3-PentadieneC. 1,3-ButadieneD. Pent-3-en-1-yne |
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Answer» Correct Answer - B The molecule 2,3-pentadiene does not have any mirror plane which makes the molecule chiral. |
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| 158. |
Which of the following statements is not correct ?A. C-Cl bond in vinyl chloride is less polar than in `CH_(3)Cl`B. C-Cl bond in vinyl chloride is stronger than in `CH_(3)Cl`C. C-Cl bond in vinyl chloride is shorter than in `CH_(3)Cl`D. Vinyl chloride undergo nucleophilic substitution readily than `CH_(3)Cl` |
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Answer» Correct Answer - D `underset("Vinyl chloride")(overset(delta+)(CH_(2))=CH-overset(delta-)(Cl))rarr overset(+)(C )H_(2)-CH=overset(-)(C )l` Due to the presence of three electrons with drawing groups. |
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| 159. |
Which of the following is gaseous fumigant ?A. Ethylene dibromide (EDB)B. p-Dichlorobenzene (PDCB)C. D.D.T.D. B.H.C. |
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Answer» Correct Answer - A Ethylene dibromide `(CH_(3)CHBr_(2))` is a powerful fumigant. |
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| 160. |
The factor which prevents decomposition of iodoform isA. MoistureB. LightC. AirD. Low temperature |
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Answer» Correct Answer - D Low temperature helps to prevent the decomposition of iodoform because C-I bond is weaker. |
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| 161. |
Dehalogenation of vicinal dihalides with Zn/alc. Mainly producesA. AlcoholB. AlkeneC. AlkyneD. Alkane |
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Answer» Correct Answer - B `underset(("Vicinal dihalide"))(overset(Br)overset(|)(C )H_(2)-overset(Br)overset(|)(C )H_(2))+Zn overset(alc.)rarr CH_(2)=CH_(2)+ZnBr_(2)` |
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| 162. |
Petroleum consists mainly ofA. aliphatic hydrocarbonsB. aromatic hydrocarbonsC. aliphatic alcoholsD. none of these |
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Answer» Correct Answer - A Aliphatic hydrocarbons. |
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| 163. |
The odd decomposition of carbon chlorine bond fromA. Two free ionsB. Two-carbonuim ionC. Two carbanionD. A cation and anion |
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Answer» Correct Answer - D `R-CH_(2)-CIoverset("Heterolytic bond fission")rarrunderset("cation")(RCH_(2)^(o+))+underset("anion")(CI)` `CI` is more electronegative than `C` by which it form anion and hydrocarbon form cation . |
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| 164. |
Bacterial decomposition of wood gives :A. MethaneB. EthaneC. EthyleneD. Acetylene |
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Answer» Correct Answer - A Methane |
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| 165. |
Assertion: `C Cl_(4)`and `H_(2)O`are immiscible . Reason : `C Cl_(4)` is a polar solvent.A. If the the assertion and reason are true and reason is a true explanation of the assertion .B. If both assertion and reason are true but reason is the correct explanation of the assertion .C. If the assertion is true but reason is trueD. If assertion is false but reason is true . |
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Answer» Correct Answer - C `C CI_(4)` is nonpolar compound . |
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| 166. |
Assertion: Bromobenzene upon reaction with `Br_(2)//Fe` gives 1,4-dibromobenzene as the major product Reason In bromobenzene the inductive effect of the bromo group is more dominant than the mesomeric effect in directing the incoming electrophile .A. If the the assertion and reason are true and reason is a true explanation of the assertion .B. If both assertion and reason are true but reason is not the correct explanation of the assertion .C. If the assertion is true but reason is falseD. If assertion is false but reason is true . |
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Answer» Correct Answer - C Bromo group is ortho- and para-directing Mesomeric effect is more dominant than the inductive effect . |
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| 167. |
The substance employed as a tear gas isA. WestronB. ChloropicrinC. ChloretoneD. None of these |
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Answer» Correct Answer - B Chloropicrin, `C Cl_(3).NO_(3)` |
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| 168. |
Which one of the following halogen compounds is difficult to be hydrolysed by `S_(N^(1))` mechanism?A. Tertiary butyl chlorideB. Isopropyl chlorideC. Benzyl chlorideD. Chlorobenzene |
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Answer» Correct Answer - D (D) Aryl halides are much less reactive towards nucleophilic substitution reactions as the halogen atoms in these compounds is firmly attached and cannot be replaced by nucleophile `(OH^(-))` easily. |
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| 169. |
Which of the following compounds would be hydrolysed most easily ?A. `C_(2)H_(5)Br`B. `CH_(3)Br`C. `CH_(2)=CH-Br`D. `CH_(2)=CH-CH_(2)-Br` |
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Answer» Correct Answer - D Allylic halides undergo substitution readily. |
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| 170. |
Which of the following compounds would be hydrolysed most easily ?A. `C_(6)H_(5)Cl`B. `C_(6)H_(5)Br`C. `C_(6)H_(5)F`D. `C_(6)H_(5)CH_(2)Cl` |
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Answer» Correct Answer - D Since C-I bond is the weakest and `I^(-)` is a better leaving group than `Br^(-), Cl^(-)` and `F^(-)` ions, therefore, `C_(2)H_(5)I` is the most reactive ethyl halide. |
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| 171. |
Which of the following compounds can exhibit optical isomerism ?A. ChlorocyclopropaneB. cis-1,2-DichlorocyclopropaneC. trans-1-2,-DichlorocyclopropaneD. trans-1,3-Dichloroprocyclopropane |
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Answer» Correct Answer - B trans-1,2-Dichlorocyclopropane has chiral structure because it is not superimosable on its mirror image. |
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| 172. |
How many isomeric compounds are possible for `C_(2)H_(2)Br_(2)` ?A. 2B. 3C. 4D. 5 |
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Answer» Correct Answer - A Three isomers are 1, 1-dibromoethene, cis-1,2-dibromoethene and trans-1,2-dibromoethene. |
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| 173. |
In an `SN_(1)` reation on chiral centers there is .A. `100%` retentionB. `100%` inversionC. `100%` recemizationD. inversion more than retention leading to partial racemization . |
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Answer» Correct Answer - D `SN_(1)` reations gives racemic mixture with slight predominance of that isomer which corresponds to inversion because `SN_(1)` also depens upon the degree of shielding of the front side of the reacting carbon . |
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| 174. |
Among the isomers of `C_(5)H_(11)Cl`, which one has a chiral structure ?A. 2,2-Dimethyl-1-chloropropaneB. 2-ChloropentaneC. 2-Methyl-2-chlorobutaneD. 3-Chloropentane |
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Answer» Correct Answer - B `CH_(3)-overset(**)underset(Cl)underset(|)(C )H-CH_(2)-CH_(2)CH_(3)` `2^(@)` Chloropentane has a chiral carbon atom. |
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| 175. |
Isopropyl chloride undergoes hydrolysis by :A. `S_(N^(1))` mechanismB. `S_(N^(2))` mechanismC. `S_(N^(1))` and `S_(N^(2))` and `S_(N^(2))` mechanism.D. |
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Answer» Correct Answer - C Isopropyl being `2^(@)` alkyl halide undergoes hydrolysis by any one of `S_(N^(1))` or `S_(N^(2))` reaction. |
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| 176. |
Which one of the following will have the maximum dipole momentA. `CH_(3)F`B. `CH_(3)Cl`C. `CH_(3)Br`D. `CH_(3)I` |
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Answer» Correct Answer - B `CH_(3)Cl` has higher dipole moment than `CH_(3)F` due to much longer C-Cl bond than C-F bond length. |
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| 177. |
Which one of the following is most reactive towards nucleophilic substitution reaction ?A. `CH_(2)=CH-Cl`B. `C_(6)H_(5)Cl`C. `CH_(3)CH=CHCl`D. `ClCH_(2)-CH=CH_(2)` |
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Answer» Correct Answer - D Allyl chloride `(ClCH_(2)CH=CH_(2))` is more reactive than vinyl `(CH_(2)=CHl, CH_(3)CH=CHCl)` and aryl `(C_(6)H_(5)Cl)` chloride. |
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| 178. |
Which one of the following is most reactive towards nucleophilic substitution reaction ?A. `CH_(2)=CH-Cl`B. `C_(6)H_(5)Cl`C. `CH_(3)CH=CH-Cl`D. `ClCH_(2)CH=CH_(2)` |
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Answer» Correct Answer - D Allyl chloride gt vinyl chloride gt chlorobenzene. |
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| 179. |
How many enantiomeric pairs can be obtained by monobromination of isopentane ?A. 3B. 1C. 2D. 4 |
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Answer» Correct Answer - C One enantiomeric pair i.e., d and l-2-bromo-3-methylbutane. |
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| 180. |
Which of the following compounds wilol undergo chemical reactions with ethanolic solution of KCN ?A. `C_(6)H_(5)Cl`B. `C_(2)H_(5)Cl`C. `CH_(3)COOH`D. All |
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Answer» Correct Answer - B `C_(3)H_(5)Cl+KCN(alc.)underset(-KCl)rarr C_(2)H_(5)-C-=N` |
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| 181. |
Which of the following compounds will react with ethanolic KCN ?A. ChlorobenzeneB. Allyl bromineC. Vinyl bromineD. p-Chlorotoluene |
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Answer» Correct Answer - B Aryl and vinyl halides do not undergo substitution readily. Allyl halides readily undergo substitution. |
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| 182. |
Which of the following is `Wurtz-Fitting reaction?A. `C_(6)H_(5)I+2Na+ICH_(3)rarrC_(6)H_(5)-CH_(3)+2NaI`B. `C_(6)H_(5)I+Cu+IC_(6)H_(5)rarrC_(6)H_(5)-C_(6)H_(5)+CuI_(2)`C. `CH_(3)I+2Na+ICH_(3)rarrCH_(3)-CH_(3)-CH_(3)+2NaI`D. none of the above |
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Answer» Correct Answer - A `C_(6)H_(5)I+2Na+ICH_(3)rarrC_(6)H_(5)-CH_(3)` This reaction is a Wurtz -Fitting reaction . |
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| 183. |
The alkyl halide that undergoes `S_(N)1` reaction more readily isA. ethyl bromideB. isopropylbromideC. n-butyl bromideD. t-butyl bromide |
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Answer» Correct Answer - D `CH_(3)CH(OH)CH_(3)overset(K_(2)Cr_(2)O_(7))underset(H_(2)SO_(4))rarr underset((C_(3)H_(6)O))(CH_(3)COCH_(3))overset("Warm")underset(I_(2)+NaOH)rarr CH-I_(3)` |
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| 184. |
Which one of following compounds undergoes `EI` reaction most readily?A. `CH_(3) -underset(Br)underset(|)overset(CH_(3))overset(|)C-CH_(2) -CH_(3)`B. `CH_(3)_CH_(2)-CH_(2)-Br`C. `CH_(3)-CH_(2)-CH_(2) -I`D. `CH_(3) -underset(I)underset(|)overset(CH_(3))overset(|)C-CH_(2) -CH_(3)` |
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Answer» Correct Answer - D AC Cording to stability of carbocation and leaving ability of leaving group . |
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| 185. |
1-chlorobutane reacts with alcoholic `KOH` to fromA. 1-butaneB. 2-butaneC. 1-butano1D. 2-butano1 |
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Answer» Correct Answer - A `CH_(3)CH_(2)CH_(2)ZCH_(2)-CI+KOH(alC)rarrCH_(3)underset("1-butene")(CH_(2)-CH=CH_(2)+KCI+H_(2)O)` . |
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| 186. |
One of the reactive intermediates of organic reactions contains a divalent carbon surrounded by six electrons but bearing no electrical charge. The species is calledA. CarbeneB. Carbenium ionC. CarbocationD. Methylene group |
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Answer» Correct Answer - A The description refers to carbene. |
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| 187. |
Which of thye following will be most reactive for `E_(1)` reaction ? .A. B. `C_(6)H_(5)-CH-Br`C. `CH_(2) =CH-overset(Br)overset(|)CH - CH_(3)`D. `CH_(2) = CH-underset(CH_(3))underset(|)overset(Br)overset(|)C -CH_(3)` |
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Answer» Correct Answer - A AC Cording to stability of carbocation |
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| 188. |
1-chlorobutane reacts with alcoholic `KOH` to fromA. 1-buteneB. 2-buteneC. 1-butanolD. 2-butanol |
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Answer» Correct Answer - A `CH_(3)CH_(2)CH_(2)CH_(2)-CI + KOH (alc)`rarr `CH_(3) CH_(2) -underset(1-buten e)(CH =CH_(2) +KCI +H_(2)O` . |
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| 189. |
Which of the following cannot react with sodium hypoiodite ?A. MethanolB. EthanolC. 2-PropanolD. All of these will react |
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Answer» Correct Answer - A Methanol. |
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| 190. |
Iodofrom can be prepared from all exceptA. IsopropylacoholB. 3-Methyl-2-butanoneC. IsobutylachoholD. Ethyl methyl ketone |
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Answer» Correct Answer - C Iodoform can be obtained only deom the compounds containing `CH_(3)-overset(O)overset("||")("C")-` or `CH_(3)-overset(OH)overset("| ")("C ")H-` group. |
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| 191. |
Which compound does not from iodofrom with alkali and iodine? .A. AcetoneB. Ethano1C. Diethy 1ketoneD. Isopropyl alcohol |
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Answer» Correct Answer - C `CH_(3) CH_(2) -CO -CH_(2) -CH_(3) overset(NaOH//I)_(2)rarr` No yellow ppt `{:(CH_(3)COCH_(3)overset(NaOH//I_(2))toCH_(3)CHI_(3)),(C_(2)OH_(5)overset(NaOH//I_(2))toCHI_(3)),(CH_(3)-underset(OH)underset(|)CH -CH_(3)overset(NaOH//I_(2))toCHI_(3)):}}Yellow ppt` . |
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| 192. |
`PCl_(5)+SO_(2)rarrX+Y` `CH_(3)CH_(2)OH+X rarr CH_(3)CH_(2)Cl` The compound X isA. `SOCl_(2)`B. `POCl_(3)`C. `PCl_(3)`D. `SO_(2)Cl_(2)` |
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Answer» Correct Answer - A `PCl_(5)+SO_(2)rarr POCl_(3)+underset((X))(SOCl_(2))CH_(3)CH_(2)OH+SOCl_(2)rarr CH_(3)CH_(2)Cl+SO_(2)uarr +HCl uarr` |
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| 193. |
The IUPAC name of the compound isA. propionic acidB. dipropanoic acidC. ethoxy propanoic acidD. propanoic acid |
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Answer» Correct Answer - D The compound have the structure |
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| 194. |
The IUPAC name of isA. 2,2,4,4 tetramethyl pentaneB. 2,2-dimethyl propaneC. 4-ethyl-3-methyl,hex-3-eneD. ethyl is a propyl ethene |
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Answer» Correct Answer - C The compound have the structure |
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| 195. |
n-Heptane passed over chromium trioxide supported over alumina at 873 K finally givesA. TolueneB. CycloheptaneC. CarboxycyclohexaneD. Ethylcyclopentane |
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Answer» Correct Answer - A This refers to the aromatisation process. |
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| 196. |
Which statement is not correct ?A. Pyrolysis of ethane produces mixture of ethene, hydrogen and methaneB. Ethane can be sulphonated by treatment with conc. `H_(2)SO_(4)`C. Alkanes with 1-5 carbon atoms can be nitrated by vapour phase nitration techniqueD. n-butane can undergo isomerisation in the presence of aluminium chloride at 300 K. |
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Answer» Correct Answer - B Members lower than hexane cannot be sulphonated. |
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| 197. |
Under the influene of air and light chloroform decomposes intoA. `C Cl_(4)`B. `(CH_(3))_(2)C-overset(OH)overset("| ")("C ")-Cl_(3)`C. `COCl_(2)`D. `C Cl_(3)CHO` |
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Answer» Correct Answer - C `CHCl_(3)+1//2O_(2)overset("Sunlight")underset(-HCl)rarr COCl_(2)` |
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| 198. |
Chlorobenzene can be prepared by reacting aniline withA. hydrochloric acidB. cuprous chlorideC. chlorine in presence of anhydrous aluminium chlorideD. nitrous acid followed by heating with cuprous chloride . |
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Answer» Correct Answer - D `C_(6)H_(5)NH_(2)underset(HCI)overset(HONO)rarrC_(6)H_(5)N_(2)CIoverset(CuCI)rarrC_(6)H_(5)CI` . |
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| 199. |
Consider the following reaction Thyroxine a thyroid hormone that helps to regulate metabolic rate . A. .B. .C. .D. . |
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Answer» Correct Answer - D Electrophilic substitution takes place ortho to `(-OH)` group not ortho to`(-underset(••)overset(••)(O)-)` group Since it is deactivated by the strong -e withdrawing group `(-COO^(-) and overset(+)NH_(3))` in the another ring . |
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| 200. |
Photochemical chlorination is initiated by a process ofA. PyrolysisB. PeroxidationC. HomolysisD. Rearrangement |
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Answer» Correct Answer - C `Cl : Cl overset(hv)underset("Homolysis")rarr 2Cl^(*)` …….. Chain initiation strp |
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