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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. |
The reaction that give good yield of n-Hexane is :-A. `undersetoverset(Na//"dry ether")(rarr)(CH_(3)CH_(2))CH_(2)-Cl + CH_(3)CH_(2)CH_(2)Cl`B. `CH_(3)CH_(2)Cl + CH_(3)CH_(2)CH_(2)CH_(2)Cl overset(Na//"dry ether")rarr`C. `underset overset(Na//"dry ether")rarr(CH_(3)-Cl)+CH_(3)CH_(2)CH_(2)CH_(2)CH_(2)Cl`D. All of them |
| Answer» Correct Answer - A | |
| 202. |
The homologue of ethyne isA. `C_2H_4`B. `C_2H_6`C. `C_3H_8`D. `C_3H_4` |
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Answer» Correct Answer - D `C_2H_2` and `C_3H_4` are homologue because they differ by `-CH_2` group. Both have triple bond in their molecule |
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| 203. |
Triple bond of ethyne is made ofA. Three `sigma`-bondsB. Three `pi`-bondsC. Two `sigma` and one `pi`-bondD. Two `pi` and one `sigma` -bond |
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Answer» Correct Answer - D In `CH-=CH` triple bond consists of one `sigma` and two `pi` bonds. |
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| 204. |
Calcium carbide on reacting with water givesA. MethaneB. EthaneC. EtheneD. Acetylene |
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Answer» Correct Answer - D `CaC_2+2H_2O to underset"Acetylene"(CH-=CH)+Ca(OH)_2` |
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| 205. |
Acetylene can be obtained by the reactionA. `HCOOKoverset"electrolysis"to `B. `CHI_3 + 6Ag+CHI_3oversetDeltato`C. `CH_3CH_2OH underset(443^@C)overset(Conc. H_2SO_4)to`D. `Be_2C+H_2O to` |
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Answer» Correct Answer - B Acetylene can be obtained by the reaction of silver and chloroform (or iodoform ) `2CHI + 6Ag overset(Delta)to underset"acetylene"(C_2H_2+6AgI)` |
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| 206. |
Successive alkanes differ byA. B. C. `-CH_3`D. `C_2H_4` |
| Answer» Correct Answer - A | |
| 207. |
`CaC_2+H_2O to X overset(O_3//H_2O // OH^(+))to HCOOH` X isA. `C_2H_4`B. `C_2H_2`C. `C_2H_6`D. `Ca(OH)_2` |
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Answer» Correct Answer - B `underset"calcuim carbide"(CaC_2)+2H_2O underset(-Ca(OH)_2)to underset"ethyne"(C_2H_2)underset((II)H_2O //H(+))overset((I)O_3)to underset"formic acid""HCOOH"+underset"formic acid""HCOOH"` |
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| 208. |
Which of the following is formed as a result of biological oxidation of benzene in the body of the dogA. Acrylic acidB. Cinnamic acidC. Maleic acidD. Gluconic acid |
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Answer» Correct Answer - B Biological oxidation of benzene gives cinnamic acid |
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| 209. |
In the case homologous series of alkanes, which one of the following statements is incorrectA. The members of the series are isomers of each otherB. The member of the series have similar chemical propertiesC. The members of the series have the general formula `C_n H_(2n+2)`, where n is an intergerD. The difference between any two successive members of the series corresponds to 14 units of relative atomic mass |
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Answer» Correct Answer - A The difference between any two successive numbers of the homologous series `-CH_2`-i.e., the molecular weight of every two adjacent members differ by 14. `(CH_2=12+2=14)` |
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| 210. |
Which of the following chemical system is non aromaticA. B. C. D. |
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Answer» Correct Answer - D Huckel rule is not obeyed. No Continuous conjugation |
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| 211. |
Which of the following is aromaticA. B. C. D. |
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Answer» Correct Answer - C A `6pi`-system having conjugation |
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| 212. |
The final product of complete oxidation of hydrocarbons isA. AcidB. AldehydeC. `H_2O+CO_2`D. Dihydric alcohol |
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Answer» Correct Answer - C `underset"Methane"(CH_4)+2O_2 to CO_2 + 2H_2O` `underset"Ethene"(C_2H_4)+3O_2 to 2CO_2 + 2H_2O` All hydrocarbons saturated or unsaturated on complete combustion always produce `CO_2` and `H_2O` |
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| 213. |
By wurtz reaction a mixture of methyl iodide and ethyl iodide givesA. ButaneB. EthaneC. PropaneD. A mixture of the above three |
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Answer» Correct Answer - D All-butane, Ethane and Propane are possible in this reaction |
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| 214. |
Methane and ethane both can be obtained in single step fromA. `CH_3I`B. `C_2H_5I`C. `CH_3OH`D. `C_2H_5OH` |
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Answer» Correct Answer - A `CH_3I+2Hoverset"Zn/HCl"to CH_4+HI` `CH_3I+2Na+ICH_3underset"Ether"overset"Dry"to CH_3-CH_3-2NaI` |
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| 215. |
Which represents an alkaneA. `C_5H_8`B. `C_8H_6`C. `C_9H_10`D. `C_7H_16` |
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Answer» Correct Answer - D `C_7H_16 (C_n H_(2n+2))` |
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| 216. |
Most of the hydrocarbons from petroleum are obtained byA. Fractional distillationB. Fractional crystallizationC. VaporizationD. Polymerization |
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Answer» Correct Answer - A Fractional distillation is based on the difference in the boiling point of different components |
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| 217. |
When petroleum is heated the vapours contain mainlyA. KeroseneB. Petroleum etherC. DieselD. Machine oil |
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Answer» Correct Answer - B Due to its lowest boiling point |
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| 218. |
Petroleium mainly contains `:`A. Aromatic hydrocarbonsB. Aliphatic hydrocarbonsC. Cycloalkanes and aromaticD. Inorganic compounds |
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Answer» Correct Answer - 2 Petroleum mainly consists of a mixture of aliphatic hydrocarbons particularly alkanes `(C_(1)" to "C_(40)).` |
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| 219. |
Benzene reacts with `CH_(3)Cl` in the presence of anyhydrous `AlCl_(3)` to formA. TolueneB. ChlorobenzeneC. BenzylchlorideD. Xylene |
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Answer» Correct Answer - 1 `C_(8)H_(6)+CH_(3)Cloverset(AlCl_(3))rarrC_(6)H_(5)CH_(3)+HCl`. |
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| 220. |
For the synthesis of benzoic acid , the only CORRECT combination isA. (II)(i)(S)B. (I)(iv)(Q)C. (IV)(ii)(P)D. (III)(iv)(R) |
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Answer» Correct Answer - A Haloform reaction of acetophenone yields benzoic acid |
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| 221. |
Which of the following organic compounds has the same hybridization as its combustion product `(CO_(2))` ?A. EthaneB. EthyneC. EtheneD. Ethanol |
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Answer» Correct Answer - B In Ethyne `(CH=CH)` both carbon atoms are sp hybrid as the hybridisation of combustion product, carbon atom of `O=C=O(CO_(2))`. |
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| 222. |
The ratio of `sigma` and `pi`-bonds in benzene isA. 2B. 4C. 6D. 8 |
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Answer» Correct Answer - B Ratio=`(sigma "bonds")/(pi"bonds")=12/3=4` |
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| 223. |
Which of the following oil is obtained from benzene after fractional distillation of coal tarA. Light oilB. Heavy oilC. Middle oilD. Anthracene oil |
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Answer» Correct Answer - A Benzene on fractional distillation gives light oil [It is lighter than water and hence called as light oil] |
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| 224. |
Select true statement.A. Both major product (A) and (B) will give 1,4 addition for major product formation.B. Both reactions (A) and (B) will give 1,2 addition for major product formation.C. (A) will give 1,2 addition and (B) will give 1,4 addition for major product formation.D. (A) will give 1,4 addition and (B) will give 1,2 addition for major product formation. |
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Answer» Correct Answer - B (a) 6-MCTS is possible so 1,4 addition (b) Only 4-MCTS is Possible so 1,2 addition |
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| 225. |
Which of the following has acidic hydrogenA. EthyneB. EtheneC. EthaneD. Benzene |
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Answer» Correct Answer - A `2CH-=CH+2Na to 2CH -= C^(-) Na^(+) + H_2` Reaction with sodium metal shows that hydrogen is acidic |
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| 226. |
The highest boiling point is expected forA. Iso-butaneB. n-octaneC. 2,2,3,3-tetramethyl butaneD. n-butane |
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Answer» Correct Answer - B Boiling point increases with increasing number of C- atoms and boiling point of straight chain compound is higher than corresponding side chain hydrocarbon. |
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| 227. |
Which of the following cycloalkane gives open chain compound, when reacts with bromineA. CyclopropaneB. CyclopentaneC. CyclohexaneD. Cyclo-octane |
| Answer» Correct Answer - A | |
| 228. |
Which cycloalkane has the lowest heat of combustion per `CH_2` groupA. CyclopropaneB. CyclobutaneC. CyclopentaneD. Cyclohexane |
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Answer» Correct Answer - D In cyclopropane, the angle strain is maximum hence it is a highly strained molecule and consequently most unstable . The angle strain in cyclobutane is less than than in cyclopropane, hence cyclobutane is more stable than cyclopropane, hence cyclobutane is more stable than cyclopropane. This stability increases upto 6 membered rings, then decreases from 7 to 11 membered rings and from the 12 membered onwards attains the stability of 6 membered ring. Heat of combustion is a method of measuring chemical stability . Hence cyclohenxane has the lowest heat of combustion per `-CH_2` group. |
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| 229. |
Pick out the alkane which differs from the other members of the groupA. 2,2-dimethylpropaneB. PentaneC. 2-methyl butaneD. 2,2-dimethyl butane |
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Answer» Correct Answer - D Except 2,2 dimethyl butane, rest compound contain 5 carbon i.e., pentane while 2,2 dimethyl butane contain 6 carbon i.e., Hexane `CH_3-CH_2-undersetunderset(CH_3)(|)oversetoverset(CH_3)(|)C-CH_3` |
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| 230. |
Which of the following are highly reactive towards electrophileA. B. C. D. |
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Answer» Correct Answer - B::C A compound will be reactive towards electrophile if the benzene ring is electron rich. In (b) and (c ) -OH group and `-NH-oversetoversetO"||"C-R` group will make the benzene ring highly electron rich due to there ability to donate their electrons inside the benzene ring hence (b) and (c ) are correct. In (a) and (d) since `-NO_2` and -CHO are electron withdrawing groups they will push electrons from the benzene system and make it electron deficient. Hence (a) and (d) are wrong |
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| 231. |
Producer gas is a mixture of …………………. And …………………..,A. CO and `N_2`B. `CO_2` and `H_2`C. `N_2` and `O_2`D. `CH_4` and `N_2` |
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Answer» Correct Answer - A Producer gas-CO and `N_2` |
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| 232. |
The chemical added to leaded petrol to prevent the deposition of lead in the combustion chamber isA. Iso-octaneB. Ethylene dibromideC. Tetraethyl leadD. Mercaptan |
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Answer» Correct Answer - B `Pb(C_2H_5)_4overset"heat"to Pb+underset"Ethyl radical"(4CH_3CH_2)` `undersetunderset(Br)(|)(CH_2)-undersetunderset(Br)(|)(CH_2)+Pbto underset"Ethene"(CH_2=CH_2)+underset"Lead bromide"(PbBr_2)` As leaded gasoline burns, lead metal gets deposited in the engine which is removed by adding ethylene dibromide. The lead bromide is volatile and is carried off with the exhaust gases from the engine. |
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| 233. |
Which of the following gases is used for the weldingA. MethaneB. EthaneC. AcetyleneD. Ethene |
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Answer» Correct Answer - C `2CH-=CH+5O_2 to 4 CO_2 + 2 H_2O DeltaH =1300 KJ` The combustion of acetylene is highly exothermic and the heat produced during the combustion can be used for welding purposes in the form of oxy acetylene flame |
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| 234. |
The poisonous gas that comes out with petrol burning in a car isA. `CH_4`B. `C_2H_6`C. `CO_2`D. CO |
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Answer» Correct Answer - D On petrol burning CO comes out which is so much poisonous gas |
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| 235. |
Propionic acid is subjected to reduction with hydroiodic acid in the presence of a little P, the product formed isA. EthaneB. PropaneC. ButaneD. None of these |
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Answer» Correct Answer - B `underset"Propanoic acid"(CH_3-CH_2-COOH+6HI)overset"red P"to underset"Propane"(CH_3-CH_2-CH_3+2H_2O+3I_2` |
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| 236. |
Petroleum ether can be used asA. Solvent for fat, oil, varnish and rubberB. As a fuelC. Both (a) and (b)D. None of these |
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Answer» Correct Answer - A Solvent for fat, oil , varnish and rubber |
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| 237. |
Which of the following is oxidised by `KMnO_4`A. MethaneB. PentaneC. IsobutaneD. Neopentane |
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Answer» Correct Answer - C `(CH_3)_3 CHoverset(KMnO_4)to underset"tertiary butyl alcohol"((CH_3)_3C-OH)` |
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| 238. |
n-hexadecane has cetane numberA. 90B. 100C. 110D. Zero |
| Answer» Correct Answer - B | |
| 239. |
`KMnO_4` will oxidised acetylene toA. Ethylene glycolB. Ethyl alcoholC. Oxalic acidD. Acetic acid |
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Answer» Correct Answer - C `{:(CHoverset(KMnO_4)to,COOH),("|||","|"),("Acetylene","Oxalic acid"):}` |
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| 240. |
Cetane is a compound which has very good ignition property. Chemically it isA. `CH_3(CH_2)_14CH_3`B. `(CH_3)_3C(CH_2)_11CH_3`C. `C_17H_34`D. None of these |
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Answer» Correct Answer - A Cetane is chemically hexadecane i.e., `CH_3(CH_2)_14 CH_3` |
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| 241. |
The hybridisation state of carbon in fullerence isA. spB. `sp^2`C. `sp^3`D. `sp^3d` |
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Answer» Correct Answer - B The hybirdisation state of carbon is fullerene is `sp^2` |
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| 242. |
Kerosene is a mixture ofA. AlkanesB. Aromatic compoundsC. AlcoholsD. Aliphatic acids |
| Answer» Correct Answer - A | |
| 243. |
Photochemical chlorination is initiated by a process ofA. PyrolysisB. SubstitutionC. HomolysisD. Peroxidation |
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Answer» Correct Answer - C Chlorination of alkane in photochemical reaction takes place by free radial mechanism. Free radicals are formed by homolytic bond fission or homolysis. |
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| 244. |
Which of the following has highest octane number?A. n-hexaneB. n-heptaneC. n-pentaneD. 2,2,4-trimethyl pentane |
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Answer» Correct Answer - D Iso-octane i.e. 2,2,4-trimethyl pentane has highest octane number |
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| 245. |
Aqueous solution of the following compound on electrolysis gives ethaneA. Acetic acidB. AcetamideC. Potassium acetateD. Ethyl acetate |
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Answer» Correct Answer - C `underset"Potassium acetate"(2CH_3COOK)+2H_2O overset"Electrolysis"to CH_3-CH_3+underset"Anode"(2CO_2)+underset"Cathode"(2KOH +H_2)` |
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| 246. |
How many monochloro derivatives are possible for pentane? |
| Answer» Correct Answer - D | |
| 247. |
Which reactions are most common in alkenesA. Electrophilic substitution reactionsB. Nucleophilic substitution reactionsC. Electrophilic addition reactionsD. Nucleophilic addition reactions |
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Answer» Correct Answer - C Electrophilic addition reactions are shown by alkenes or alkynes, in these reactions attacking species is electrophiles `CH_3-CH=CH_2+H^(+)overset"Slow"to underset(2^@"carbonium ion")(CH_3-overset+CH-CH_3)` `CH_3-overset+CH-CH_3+Br^(-)overset"Fast"to underset"2-Bromopropane"(CH_3-undersetunderset(Br)(|)CH-CH_3)` |
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| 248. |
Assertion :Activating groups are electron donors. Reason: Nitroso group is activating groupA. If both assertion and reason are true and the reason is the correct explanation of the assertionB. If both assertion and reason are true but reason is not the correct explanation of the assertionC. if assertion is true but reason is falseD. If assertion and reason both are false |
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Answer» Correct Answer - C Like halogens , the nitroso group (-N=O) is also deactivating but o, p-directing. It is deactivating because O is more electronegative than N and hence NO group as whole withdraws electrons from the benzene ring |
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| 249. |
Find out the wrong statement about corey House reaction.A. The rate of reaction for alkane synthesis by corey House reaction si `1^(@) R-X gt 2^(@) R-X gt 3^(@) R-X`B. This is good process to obtain alkane with odd number of carbons atomsC. It introduce alkyl part in form of `R^(o+)`D. It gives alkene as major product with `3^(@) R-X` |
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Answer» Correct Answer - C It introduce alkyl part in form of `R^(Theta)` |
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| 250. |
Main constituent of marsh gas isA. `C_2H_2`B. `CH_4`C. `H_2S`D. CO |
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Answer» Correct Answer - B Marsh gas mainly consists of methane |
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