MCQOPTIONS
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MCQOPTIONS
This section includes 2539 Mcqs, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 351. |
Which of the following has highest octane number………….. |
| A. | n-hexane |
| B. | n-heptane |
| C. | Iso-octane |
| D. | n-heptane and iso-octane mixed in ratio 50 : 50 |
| Answer» D. n-heptane and iso-octane mixed in ratio 50 : 50 | |
| 352. |
Reduction of Aldehydes and Ketones to hydrocarbon take place in the presence of …………… |
| A. | Zn amalgam and HCl acid |
| B. | Pb /BaSO4 |
| C. | Anhydrous AlCl3 |
| D. | Ni / Pt |
| Answer» B. Pb /BaSO4 | |
| 353. |
Cross Cannizzaro reaction is given by……….. |
| A. | C6H5CHO |
| B. | C6H5CHO |
| C. | CH3CHO |
| D. | All of above |
| Answer» B. C6H5CHO | |
| 354. |
The chemical added to leaded petrol to prevent the deposition of lead in the combustion chamberis…… |
| A. | Iso-octane |
| B. | Ethylene dibromide |
| C. | Tetraethyl lead |
| D. | Mercaptan |
| Answer» C. Tetraethyl lead | |
| 355. |
Dimethyl ether and ethyl alcohol are ….. |
| A. | Branched isomer |
| B. | Position isomer |
| C. | Functional isomer |
| D. | Tautomer |
| Answer» D. Tautomer | |
| 356. |
If ethanol dissolves in water, then which of the following would be done…… |
| A. | Absorption of heat and contraction in volume |
| B. | Emission of heat and contraction in volume |
| C. | Absorption of heat and increase in volume |
| D. | Emission of heat and increase in volume |
| Answer» C. Absorption of heat and increase in volume | |
| 357. |
C2H5OH can be differentiated from CH3OH by….. |
| A. | Reaction with HCl |
| B. | Reaction with 3 NH |
| C. | By iodoform test |
| D. | By solubility in water |
| Answer» D. By solubility in water | |
| 358. |
Which of the following on reaction with NH3 gives urinary antiseptic compound. |
| A. | HCHO |
| B. | CH3 CHO |
| C. | C6H5 CHO |
| D. | C6H5CH3CHO |
| Answer» B. CH3 CHO | |
| 359. |
Which of the following react with water? |
| A. | ClCH2CH2Cl |
| B. | Cl3CCHO |
| C. | CCl4 |
| D. | All of above |
| Answer» C. CCl4 | |
| 360. |
Which suffix attached in alcohol. |
| A. | En |
| B. | Ol |
| C. | Ene |
| D. | Hyde |
| Answer» C. Ene | |
| 361. |
The product of reduction of benzaldehyde is ….. |
| A. | Benzoic acid |
| B. | Benzyl alcohol |
| C. | Benzene |
| D. | Catechol |
| Answer» C. Benzene | |
| 362. |
What is color is Chloral hydrate? |
| A. | Yellow |
| B. | White |
| C. | Colourless |
| D. | None |
| Answer» D. None | |
| 363. |
Absolute ethanol cannot be obtained by simple fraction of a solution of ethanol and water because….. |
| A. | Their B.P.'s are very nearer |
| B. | Ethanol remains dissolved in water |
| C. | They form a constant boiling mixture |
| D. | Ethanol molecules are solvated |
| Answer» D. Ethanol molecules are solvated | |
| 364. |
Which of the following reagents is used to distinguish acetone and Acetophenone? |
| A. | NaHSO3 |
| B. | Grignard reagent |
| C. | Na2SO4 |
| D. | NHCl4 |
| Answer» B. Grignard reagent | |
| 365. |
A sample of petrol is a mixture of 30% n-heptane and 70% iso-octane. The sample has octanenumber………… |
| A. | 30 |
| B. | 70 |
| C. | 15 |
| D. | 35 |
| Answer» C. 15 | |
| 366. |
A liquid hydrocarbon can be converted to gaseous hydrocarbon by………….. |
| A. | Cracking |
| B. | Hydrolysis |
| C. | Oxidation |
| D. | Distillation under reduced pressure |
| Answer» B. Hydrolysis | |
| 367. |
Which of the following is dihydric alcohol ……. |
| A. | Glycerol |
| B. | Ethylene glycol |
| C. | Catechol |
| D. | Resorcinol |
| Answer» C. Catechol | |
| 368. |
In the preparation of alkanes; a concentrated aqueous solution of sodium or potassium salts ofsaturated carboxylic acid are subjected to……… |
| A. | Hydrolysis |
| B. | Oxidation |
| C. | Hydrogenation |
| D. | Electrolysis |
| Answer» E. | |
| 369. |
Grignard reagent is not prepared in aqueous medium but prepared; in ether medium because thereagent………….. |
| A. | Reacts with water |
| B. | Is insoluble in water |
| C. | Is highly reactive in ether |
| D. | Becomes inactive in water |
| Answer» B. Is insoluble in water | |
| 370. |
The compound obtained by the reduction of propionaldehyde by amalgamated zinc and concentratedHCl is……………. |
| A. | Propanol |
| B. | Propane |
| C. | Propene |
| D. | All of these |
| Answer» C. Propene | |
| 371. |
When two molecules of acetaldehyde condense in the presence of dilute alkali, it forms…………. |
| A. | Acetal |
| B. | Sodium formate |
| C. | Aldol |
| D. | Methylene |
| Answer» D. Methylene | |
| 372. |
Benzyl alcohol is obtained from benzaldehyde by….. |
| A. | Fittig's reaction |
| B. | Cannizaro's reaction |
| C. | Kolbe's reaction |
| D. | Wurtz's reaction |
| Answer» C. Kolbe's reaction | |
| 373. |
Which enzyme converts glucose and fructose both into ethanol…….. |
| A. | Diastase |
| B. | Invertase |
| C. | Zymase |
| D. | Maltase |
| Answer» D. Maltase | |
| 374. |
Petroleum refining is …………… |
| A. | Distillation of petroleum to get different fractions |
| B. | Obtaining aromatic compounds from aliphatic compounds present in petroleum |
| C. | Cracking of petroleum to get gaseous hydrocarbons |
| D. | Purification of petroleum |
| Answer» B. Obtaining aromatic compounds from aliphatic compounds present in petroleum | |
| 375. |
Glycerol is a…… |
| A. | Primary alcohol |
| B. | Monohydric alcohol |
| C. | Secondary alcohol |
| D. | Trihydric alcohol |
| Answer» E. | |
| 376. |
Aromatic aldehydes reduce………… |
| A. | Tollen’s reagent |
| B. | Benedict’s reagent |
| C. | Fehling reagent |
| D. | All of above |
| Answer» B. Benedict’s reagent | |
| 377. |
Kerosene is used as fuel because it is…………. |
| A. | Less volatile |
| B. | More volatile |
| C. | Cheap |
| D. | Abundantly available |
| Answer» C. Cheap | |
| 378. |
In esterification, the reactivity of alcohols is …… |
| A. | 1° > 2° > 3° |
| B. | 3° > 2° > 1° |
| C. | Same in all cases |
| D. | None of these |
| Answer» B. 3° > 2° > 1° | |
| 379. |
Which of the following compounds is used in antiknock compositions to prevent the deposition ofoxides of lead on spark plug, combustion chamber and exhaust pipe……. |
| A. | Glycerol |
| B. | Glycol |
| C. | 1, 2-dibromoethane |
| D. | Benzene |
| Answer» D. Benzene | |
| 380. |
Which of the following has the most acidic hydrogen? |
| A. | 3-hexanone |
| B. | 2, 4-hexanedione |
| C. | 2, 5-hexanedione |
| D. | 2, 3-hexanedione |
| Answer» C. 2, 5-hexanedione | |
| 381. |
. The alcohol that produces turbidity immediately with ZnCl2 + conc. HCl at room temperature….. |
| A. | 1-hydroxybutane |
| B. | 2-hydroxybutane |
| C. | 2-hydroxy-2-methylpropane |
| D. | 1-hydroxy-2-methylpropane |
| Answer» D. 1-hydroxy-2-methylpropane | |
| 382. |
Which will dehydrate easily……. |
| A. | 3-methyl-2-butanol |
| B. | Ethyl alcohol |
| C. | 2-methyl propane-2-ol |
| D. | 2-methyl butanol-2 |
| Answer» E. | |
| 383. |
The compound HOH2C - CH2OH is……. |
| A. | Ethane glycol |
| B. | Ethylene glycol |
| C. | Ethylidene alcohol |
| D. | Dimethyl alcohol |
| Answer» C. Ethylidene alcohol | |
| 384. |
Which of the following is incorrect…………. |
| A. | FeCl3 is used in the detection of phenols |
| B. | Fehling solution is used in the detection of glucose |
| C. | Tollen’s reagent is used in detection of unsaturation |
| D. | NaHSO3 is used in the detection of carbonyl compounds |
| Answer» D. NaHSO3 is used in the detection of carbonyl compounds | |
| 385. |
The boiling point of alcohol are …. than corresponding thiols. |
| A. | More |
| B. | Same |
| C. | Either of these |
| D. | Less |
| Answer» B. Same | |
| 386. |
Methane and ethane both can be obtained in single step from ………… |
| A. | CH3 I |
| B. | C2H5I |
| C. | CH3OH |
| D. | C2H5OH |
| Answer» B. C2H5I | |
| 387. |
The decreasing order of boiling points is ………. |
| A. | n-Pentane > iso-Pentane > neo-Pentane |
| B. | iso-Pentane > n-Pentane > neo-Pentane |
| C. | neo-Pentane > iso-Pentane > n-Pentane |
| D. | n-Pentane > neo-Pentane > iso-Pentane |
| Answer» B. iso-Pentane > n-Pentane > neo-Pentane | |
| 388. |
Fischer Tropsch process is used for the manufacture of………… |
| A. | Synthetic petrol |
| B. | Thermosetting plastics |
| C. | Ethanol |
| D. | Benzene |
| Answer» B. Thermosetting plastics | |
| 389. |
Benzoin is……….. |
| A. | Compound containing an aldehyde and a ketonic group |
| B. | α , ß -unsaturated acid |
| C. | α-hydroxy aldehyde |
| D. | α -hydroxy ketone |
| Answer» E. | |
| 390. |
Which of the following will not give iodoform test ? |
| A. | Isopropyl alcohol |
| B. | Ethanol |
| C. | Ethanal |
| D. | Benzyl alcohol |
| Answer» E. | |
| 391. |
Wood spirit is known as ……… |
| A. | Methanol |
| B. | Ethanol |
| C. | Acetone |
| D. | Benzene |
| Answer» B. Ethanol | |
| 392. |
When ethyl iodide and propyl iodide react with Na in the presence of ether, they form……… |
| A. | One alkane |
| B. | Two alkanes |
| C. | Four alkanes |
| D. | Three alkanes |
| Answer» E. | |
| 393. |
A petroleum fraction having boiling range 70-200°C and containing 6-10 carbon atoms permolecule is called……….. |
| A. | Natural gas |
| B. | Gas oil |
| C. | Gasoline |
| D. | Kerosene |
| Answer» D. Kerosene | |
| 394. |
Methylated spirit is…….. |
| A. | Methanol |
| B. | Methanol + ethanol |
| C. | Methanoic acid |
| D. | Methanamide |
| Answer» C. Methanoic acid | |
| 395. |
Primary alcohols can be obtained from the reaction of the RMgX…… |
| A. | CO2 |
| B. | HCHO |
| C. | CH3 CHO |
| D. | H2O |
| Answer» C. CH3 CHO | |
| 396. |
Which alcohol reacts with fatty acids to form fats……. |
| A. | Ethanol |
| B. | Glycerol |
| C. | Methanol |
| D. | Isopropanol |
| Answer» C. Methanol | |
| 397. |
To prepare a pure sample of n-hexane using sodium metal as one reactant, the other reactant will be……… |
| A. | n-propyl bromide |
| B. | Ethyl bromide and n-butyl bromide |
| C. | Ethyl chloride and n-butyl chloride |
| D. | Methyl bromide and n -pentyl chloride |
| Answer» B. Ethyl bromide and n-butyl bromide | |
| 398. |
Glycerol is used…….. |
| A. | As a sweetening agent |
| B. | In the manufacture of good quality soap |
| C. | In the manufacture of nitro glycerine |
| D. | In all of these |
| Answer» E. | |
| 399. |
Acetic acid and CH3 are obtained on large scale by destructive distillation of….. |
| A. | Wood |
| B. | Coal |
| C. | Turpentine |
| D. | Crude oil |
| Answer» B. Coal | |
| 400. |
Carbonyl compounds are usually …………… |
| A. | Ethers, aldehydes, ketones and carboxylic acids |
| B. | Aldehydes, ketones and carboxylic acids |
| C. | Aldehydes and ketones |
| D. | Carboxylic acids |
| Answer» D. Carboxylic acids | |