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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. |
Ethyl chloride react with sodium ethaoxide given,A. ethoxy ethaneB. methoxy ethaneC. ethaneD. n-butane |
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Answer» Correct Answer - A `C_(2)H_(5)Cl+C_(2)H_(5)ONa overset(Delta) to C_(2)H_(5)OC_(2)H_(5)+NaCl` |
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| 202. |
In `S_(N^(2))` reactions, the correct order of reactivity for the compounds `CH_(3)Cl,CH_(3)CH_(2)Cl,(CH_(3))_(2)CHCl` and `(CH_(3))_(3)C Cl` is:A. `CH_(3)Cl gt (CH_(3))_(2) CHCl gt CH_(3)CH_(2)Cl gt (CH_(3))_(3) C Cl`B. `CH_(3)Cl gt CH_(3)CH_(2)Cl gt (CH_(3))_(2)CHCl gt (CH_(3))_(3) C Cl`C. `CH_(3)CH_(2)Cl gt CH_(3)Cl gt (CH_(3))_(2)CHCl gt (CH_(3))_(3)C Cl`D. `(CH_(3))_(2) CHCl gt CH_(3)CH_(2) Cl gt C H_(3)Cl gt (CH_(3))_(3)C Cl` |
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Answer» Correct Answer - B It is an example of `S_(N^(2))` reaction. The order of reactivity is inversely proportional to the steric hindrance offered by the alkyl groups. |
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| 203. |
The following alkyl halidesin the decrasing order of `SN^(2)` reactivity , is `1 (CH_(3))_(3) C Cl " " 2 CH_(3)Br` 4 `CH_(3)Cl " " 4 (CH_(3))_(2)CHCl`A. `1 gt 2 gt 3 gt 4`B. `2 gt 3 gt 4 gt 1`C. `3 gt 2 gt 4 gt 1`D. `2 gt 3 gt 1 gt 4` |
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Answer» Correct Answer - B Primary alkayl halides aremoarereactive,but bromide is more reactive than chloride. Compoud 4 and 1 are secondary and tertiary alkyl halide respectively,but bucleophile attack on both hindered because of steric effect bt 2 and 3 methyl groups. |
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| 204. |
Assertion: `S_(N^1)` reactions are generally carried out in polar protic solvents (like water,alcohol, acetic acid etc.) Reason: `C_6H_5CH(C_6H_5)Br` is less reactive than `C_6H_5CH(CH_3)Br` in `S_(N^1)` reactions.A. If both assertion and reason are true and reason Is the correct explanation of assertion.B. If both assertion and reason are true but reason is not the correct explanation of assertion.C. If assetion is true but reason is false.D. If both assertion and reason are false. |
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Answer» Correct Answer - C Carbocation obtained from `C_6H_5CH(CH_3)Br" as " C_6H_5CH(C_6H_5)` is stabilised by two phenyl group and hence it is more reactive in `S_(N^1)` reaction. |
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| 205. |
which of the following on heating with aqueous KOH produces acetaldehyde?A. `CH_3)C OCl`B. `CH_(3)CH_(2)Cl`C. `CH_(2)ClCH_(2)Cl`D. `CH_(3)CHCl_(2)` |
| Answer» Correct Answer - D | |
| 206. |
The order of reactivity of following alcohols with halogen acids is………. (A) `CH_(3)CH_(2)-CH_(2)-OH` (B) `CH_(3CH_(2)-underset(CH_(3))underset(|)"CH"-OH` `(C ) CH_(3)CH_(2)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-OH`A. (A)gt(B)gt(C)B. (C)gt(B)gt(A)C. BgtAgtCD. AgtCgtB |
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Answer» Correct Answer - B The correct order of reactivty of alcohols towards halogen acids is : tertiarygtsecondarygtprimary `therefore` (b). Tertiary alcohol will react with HCl at room. |
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| 207. |
`9*65D` C of electric current is passed through fused anhydrous magnesium chloride. The magnesium metal thus, obtained is completely converted into a grignard reagents. What is the number of moles of grignard reagent obtained? |
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Answer» `MgCl_(2)overset((aq))(to)MgCl^(2)+(aq)+2Cl^(-)(aq)` `Mg^(2+)(aq)+underset((2xx96500C))(2e)^(-)toMg(s)` (At cathode) `2xx29500C` of charge deposite MG metal =1mol `9*65C` of charge deposite Mg metal `=((1mol))/((2xx96500C))xx(9*65C)=5xx10^(-5)mol` `R-X+underset(1mol)(Mg)("Anhyd. ether")toR-underset(1mol)(MG)-X` `therefore` No of moles of grignard reagent obtained `=5xx10^(-5)`mol. |
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| 208. |
The halogen atom in aryl halide isA. o and p directingB. meta directingC. o, p, and m-directingD. only o-directing |
| Answer» Correct Answer - A | |
| 209. |
Which of the following series contains electrophiles only ?A. `H_(2)O,BF_(3),NO_(2)^(+)`B. `NH_(3),H_(2)O,Bl_(3)`C. `AlCl_(3),BF_(3),Cl^(+)`D. `ROH,NH_(3),NO_(3)` |
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Answer» Correct Answer - C Electrophile accepts a pair of electrons. Al atom in `AlCl_(3)` has hextet, S atom in `SO_(3)` is positively charged. Due to more electronegativity of O-atom due to more electronegativty of O-atom than s, `Cl^(+)` ionn is +vely charged. Hence. These species accept a pair of electrons. |
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| 210. |
(A) Greater the stability of carbanion, greater is its ease of formation and hence , more reactive is aryl halide. (R) Chlorobenzene is less reactive than p-chloroanisole towards nucleophilic substitution reactions.A. If both (A) and (R) are correct and (R) is the correct explanation of (A)B. If both (A) and (R) are correct but (R) is not the correct explanation of (A)C. If (A) is correct but (R) is incorrect.D. If both (A) and (R) are incorrect. |
| Answer» Correct Answer - E | |
| 211. |
If a carbanion is bonded to hydrogen or an alkyl group then, the shape of methyl carbainon is likely to beA. tetrahedralB. planarC. pyramidalD. linear |
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Answer» Correct Answer - C They are formed by heterolytic fission. Due to presence of one lone pair of electron on carbn atomis one of tetrahedral oriented, four `sp^(3)` hybride orbitals,the geometry of carbanion become pyramidal. |
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| 212. |
The shape of methyl carbocation is likely to beA. tetrahedralB. pyramidalC. planarD. linear |
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Answer» Correct Answer - C Carbocations are formed by heterolytic bond fission. `-overset(|) underset(|)C-Z to -overset(|) underset(|)C+Z^(-)` In `CH_(3)^(+)`, the carbon atom is `sp^(2)`- hybridised , so the carbon atom used `sp^(2)` hybrid orbitals to form three `sigma` bonds. A empty p-orbital is symmetrically above and below the plane of three sigma bonds. This empty p-orbital makes the carbon atom electron-defincient (eelectrophile). The three `sp^(2)` hybrid orbitals are directed towards the corners of a equilateral triangle. Hence, the shape of `CH_(3)^(+)` is likely to be planar. |
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| 213. |
Which of the following is not an organonetallic compound ?A. `C_(2)H_(5)ONa`B. `(C_(2)H_(5))_(3)Pb`C. `(CH_(3))_(3)Al`D. `CH_(3)MgBr` |
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Answer» Correct Answer - A We know that ,sodium ethoxie `(C_(2)H_(5)ONa)` is the compound in which metal atom is not directly linked in which metal atom is not directly linked to carbon atom. Therefore it is not an organiometallic compound. |
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| 214. |
An `SN^(2)` reaction at on asymmetric carbon atom of a compound always givesA. an enantiomers of a substrateB. a product with same optical rotationC. a mixture of diastereoisomersD. a single stereoisomers |
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Answer» Correct Answer - D In `SN^(2)` reaction , inverstion of configureation occurs. Since the reactant and the product are not enatiomers, therefore, the sign of optical rotation may on may not be changed and hencesingle stereoisomer is obtained. |
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| 215. |
(A)`S_(N^(2))` reaction takes place in single step. (R) `S_(N^(2))` reaction involves the reactivity order of alkyl halides as `1^(@) gt 2^(@) gt 3^(@)` halides.A. If both (A) and (R) are correct and (R) is the correct explanation of (A)B. If both (A) and (R) are correct but (R) is not the correct explanation of (A)C. If (A) is correct but (R) is incorrect.D. If (A) is incorrect but (R) is correct. |
| Answer» Correct Answer - A | |
| 216. |
The correct of reactivity of alkyl halides for `S_(N^(1))` reaction is :A. `RI gt RBr gt RCI gt RF`B. `3^(@) gt 2^(@) gt 1^(@)`C. `3^(@) lt 2^(@) lt 1^(@)`D. `RF lt RCI gt RBr gt RI` |
| Answer» Correct Answer - B | |
| 217. |
Match List I with list II and select the correct answer using the codes given below the lists: `{:("List I",,"List II"),("Compound",,"Action"),("(A) Teflon",,"(i) Ozone layer depletion"),("(B) Pyrene",,"(ii) Non-biodegradable insecticide"),("(C) DDT",,"(iii) Non-stick cookwares and issulator"),("(D) Freon",,"(iv) Fire extinguisher"):}` CodesA. (i),(ii),(iii),(iv)B. (iv),(iii),(i),(ii)C. (iii),(iv),(ii),(i)D. (ii),(i),(iv),(iii) |
| Answer» Correct Answer - C | |
| 218. |
Match List I with List II and select the correct answer using the codes given below the lists : `{:("List I",,"List II"),("Compound",,"Use"),("(A)Chloretone",,"(i) Monomer"),("(B)Chloropicrin",,"(ii) In war and as insecticide"),("(C) Lindane",,"(iii) Insecticide"),("(D) Teflon",,"(iv) Hypnotic"):}` Codes :A. (iii) , (i) , (iv) , (ii)B. (i) , (ii) ,(iii) ,(iv)C. (iv) , (iii) ,(ii) ,(i)D. (ii) , (iv) , (i) ,(iii) |
| Answer» Correct Answer - C | |
| 219. |
Match list I with list II and slect the correct anser using the codes below the lists. `{:("List I", "List II"),("Reactants", "Products"),((i)CH_(3)CH_(2)CH_(2)CH_(2)Br+KOH_((alc)),(1)"cis 2-butane"),((ii)CH_(3)CH_(2)CHBrCH_(3)KOH_((alc)),(2)"trans 2-butane"),((iii) (CH_(3))_(3)CBr+KOH_((alc)),(3) 1-"butane"),(,(4) 2-"methyl 1- propan"):}`A. `{:(""(i),(ii),(iii)),(2,1,3):}`B. `{:(""(i),(ii),(iii)),(3,4,1):}`C. `{:(""(i),(ii),(iii)),(3,1,4):}`D. `{:(""(i),(ii),(iii)),(3,2,4):}` |
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Answer» Correct Answer - D the relatie order or reactivies of the alkyl halides is `3^(@) gt 2^(@)gt 1^(@)`. The most trans isomer dominates over cis isomer. |
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| 220. |
Which of the following methods give rise to 1-bromo-2- phenylethane?A. Propene + HBr followed by reaction with benzene in the presence of `AlCl_(3)`B. Styrene +`H_(3)O^(+) +` followed by reaction with `P//Br_(2)`C. Benzene+ Oxirane `+H^(+)` followed by reaction with `P//Br_(2)`D. Benzene + Oxirane `+ H^(+)` followed towards reaction with HBr |
| Answer» Correct Answer - C | |
| 221. |
The hydrocarbon styrene `(C_(6)H_(5)CH=CH_(2))` can be prepared by the dehydrohalogenation of either 1-Bromo-2-phenylethane or 1-bromo-1-phenylethane using alcoholic KOH. Which alkyl halide will take part in the reaction? |
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Answer» 1-Bromo-1-pehnylethane is a secondary alkyl halide while the other is of primary nature. The alkene is expected to be formed by `E_(2)` elimination reaction. In this reaction, secondary alkyl halide is expected to give the desired alkene. `underset("1-Bromo-1-phenylethane")(H_(5)C_(6)-underset(Br)underset(|)(C)H-CH_(3))+KOH(alc)tounderset("Styrene")(C_(6)H_(5)-CH=CH_(2)+KBr+H_(2)O` |
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| 222. |
Give the decreasing order of bond dissociation enthalpy of halogen acids. |
| Answer» `H-F lt H-Cl lt H-Br lt H-I` | |
| 223. |
Carbon-halogen bond is strongest among the followingA. `CH_(3)Cl`B. `CH_(3)Cl`C. `CH_(3)F`D. `CH_(3)I` |
| Answer» Correct Answer - C | |
| 224. |
Which of the following halideso is most reactive towards nucleophilic substitution reaction?A. `C_(2)H_(5)Br`B. `C_(2)H_(5)Cl`C. `C_(2)H_(5)F`D. `C_(2)H_(5)I` |
| Answer» Correct Answer - D | |
| 225. |
Which of the following is the most reactive towards nucleophilic substitution reaction?A. `ClCH_2-CH=CH_2`B. `CH_2=CH-Cl`C. `CH_3CH=CH-Cl`D. `C_6H_5Cl` |
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Answer» Correct Answer - A Order of reactivity of different halo compounds towards nucleophilic substitution reactions are : allyl chloride gt vinyl chloride gt chlorobenzene. |
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| 226. |
Which of the following will give enantiomeric pair on reaction with water due to presence of asymeteric carbon atom?A. `C_2H_5-underset(C_2H_5)underset(|)overset(C_2H_5)overset(|)C-Br`B. `C_2H_5-underset(CH_3)underset(|)overset(C_2H_5)overset(|)C-Cl`C. `C_2H_5-underset(CH_3)underset(|)overset(H)overset(|)C-I`D. `CH_3-underset(C_2H_5)underset(|)overset(CH_3)overset(|)C-Br` |
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Answer» Correct Answer - C Option (c ) has asymmetric carbon atom which is joined to four different groups hence it will give optically active products or a pair of enantiomers. |
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| 227. |
Formation of ester from alkyl halide and RCOOAg is,A. electrophilic substitutionB. nucleophilic substitutionC. electrophilic additionD. nucleophilic addition |
| Answer» Correct Answer - B | |
| 228. |
Substitution reactions of alkyl halide are initiated by,A. electrophileB. nucleophileC. free readicalD. none of these |
| Answer» Correct Answer - B | |
| 229. |
In two separate experiments equal quantities of alkyl halide, `C_4H_9Cl`, were treated at the same temperature with equal volume of 0.1 molar and 0.2 molar solutions of NaOH respectively. In the two experiments, `t_(1//2)` of the two reaction were the same. The most likely structure of halide isA. `CH_3CH_2CH_2CH_2Cl`B. `CH_3CH(Cl)CH_2CH_3`C. `(CH_3)_2CHCH_2Cl`D. `(CH_3)_3C Cl` |
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Answer» Correct Answer - D As it is independent of the concentration of NaOH. So, it undergoes via `S_(N^1)`. So, most likely the halide is tertiry halide. |
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| 230. |
The reaction `RX+Nu^(-)toRNu+X^(-)` is an example ofA. Nucleophilic substitutionB. electrophilic substitutionC. Nucleophilic additionD. Electrophilic addition |
| Answer» Correct Answer - A | |
| 231. |
Identify the products (A) and (B) in the reactions. `RX+AgCNtoul((A))+AgX` `RX+KCNtoul((A))+KX`A. (A)-RCN, (B)- RCNB. (A)-RCN, (B)-RNCC. (A)-RNC, (B)-RCND. (A)-RNC, (B)-RNC |
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Answer» Correct Answer - C `RX+AgCN to underset((A))(RNC)+AgX` `RX+KCNto underset((B))(RCN)+KX` Both C and N can donate electron pairs. Since KCN is predominantly ionic and C - C bond is more stable than C - N bond in case of KCN, attack takes place through carbon atom. AgCN is predominantly covalent hence only nitrogen pair is available for bonding resulting in formation of isocyanide. |
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| 232. |
How many isomers are possible for `C_(4)H_(9)X` ?A. 1B. 2C. 3D. 4 |
| Answer» Correct Answer - D | |
| 233. |
How many `1^(@)RX` are possible for molecular formula `C_(4)H_(9)X`?A. 2B. 3C. 1D. 4 |
| Answer» Correct Answer - A | |
| 234. |
`C_(4)H_(9)X` representsA. `1^(@)and2^(@)R-X`B. `1^(@)and3^(@)RX`C. `2^(@)and3^(@)RX`D. `1^(@),2^(@),3^(@)RX` |
| Answer» Correct Answer - D | |
| 235. |
`C_(3)H_(7)X` showsA. optical isomerismB. chain isomersC. position isomerismD. position isomerism |
| Answer» Correct Answer - C | |
| 236. |
Write the structural formula of a primary alkyl halide. |
| Answer» Correct Answer - `RCH_(2)CH_(2)X` | |
| 237. |
`C_(3)H_(7)X` representsA. `1^(@)and2^(@)R-X`B. `1^(@)and3^(@)RX`C. `2^(@)and3^(@)RX`D. only `2^(@)RX` |
| Answer» Correct Answer - A | |
| 238. |
Toltal number of isomeric alkyl halide can be calculate by formulaA. `I=2^(n-1)`B. `I=2^(n-2)`C. `I=2^(n)`D. `I=2^(n-3)` |
| Answer» Correct Answer - B | |
| 239. |
Which of the following compounds does not undergo nucleophilic substitution reactions ?A. Ethyl bromideB. Vinyl chlorideC. ethyl alcoholD. Isopropyl chloride |
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Answer» Correct Answer - B We know that chlorine in vinlyl chloride is not very reactive. It doesnot takepart in nucleophilic substitution reactions, due to presenceof double bond between the two carbon atoms in the molecule. |
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| 240. |
In the preparation of iodethane form ethane which of the following is udedA. HI and HgOB. `PI_(3)`C. Only HID. `I_(2) and HIO_(3)` |
| Answer» Correct Answer - D | |
| 241. |
Ethane as well as methane can be prepared in single steps fromA. `CH_(2)I`B. `C_(2)H_(5)I`C. `CH_(3)CHO`D. `C_(2)H_(5)OH` |
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Answer» Correct Answer - A (i) `CH_(3)I overset(HI)to CH_(4)I_(2)` (ii) `2CH_(3)+I+2Na overset("ether") to CH_(3)-CH_(3)+2Nal` |
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| 242. |
Compound (A) is heated with KCN produces butyronitrile. The compound (A) isA. n-propyl alcoholB. n-butyl chlorideC. n-propyl chlorideD. n-propyl amine |
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Answer» Correct Answer - C Buteronitrile is `CH_(3)-CH_(2)-CH_(2) CN`, can be prepared form -propyl chloride `CH_(3)-CH_(2)-CH_(2)-Cl+KCN to CH_(3)-CH_(2)-CH_(2)-CN+KCl` |
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| 243. |
`CH_(3)-NC` is formed when `CH_(3)-Cl` reacts withA. KCNB. AgCNC. `CH_(3)CHO`D. KOH and `CH_(3)NH_(2)` |
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Answer» Correct Answer - B The reaction is the cyanide ion is a reaonance hybride `: overset(-)C=N: harr: C= overset(-)N: harr overset(delta-)C-=overset(delta-)N` reasonating structure resonance hybride it is clear from the reasonating structure that the CN ion can attack the nucleophili through C was well as through, N, hence called ambident nucleophilie. The KCN is ionic compound. Therefore both C and N atom are free to donate electron pair. Since C-C bond is relativity stronger stronger thatn C-N bond, hence attack forming alkyl cyanide. the AgCn is convalent covalent compound. Therefore in this case only nitrogem |
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| 244. |
1-butene and 2- butene are___________isomers.A. position isomersB. chain isomersC. geomtrical isomersD. metamers |
| Answer» Correct Answer - A | |
| 245. |
`CH_(3)CNandCH_(3)NC` are,A. position isomersB. chain isomersC. functional isomersD. metamers |
| Answer» Correct Answer - C | |
| 246. |
`CH_(3)-CH_(2)-CH_(2)-ClandCH_(3)-CHCl-CH_(3)` areA. chain isomersB. position isomersC. optical isomersD. metamers |
| Answer» Correct Answer - B | |
| 247. |
Chloroform gives a trichloro derivative of an alcohol on reaction with :A. conc. `HNO_(3)`B. aq.alkaliC. acetone and alkaliD. sodium ethoxide |
| Answer» Correct Answer - C | |
| 248. |
How many structural isomeric secondary alkyl halides aer possible for `C_(4)H_(9)X` |
| Answer» Correct Answer - B | |
| 249. |
In a group of isomeric alkyl halides the order of boiling point is :A. `P lt S lt T`B. `p gt S lt T`C. `P lt S gt T`D. `P gt S gt T` |
| Answer» Correct Answer - D | |
| 250. |
Which one of the following is not the correct order of boiling points of alkyl `//` aryl halides ?A. `CHCl_(3) gt CH_(2)Cl_(2)`B. `CH_(3)(CH_(2))_(3) Cl gt CH_(3) (CH_(2))_(2)Cl`C. `(CH_(3))_(3)C Cl gt (CH_(3))_(2) CHCH_(2)Cl`D. `CH_(3)(CH_2))_(3) Cl gt CH_(3)CH_(2)CHClCH_(3)` |
| Answer» Correct Answer - C | |