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.
| 251. |
Methyl alcohol is toxic. The reason assigned is……… |
| A. | It stops respiratory track |
| B. | It reacts with nitrogen and forms CN in the lungs |
| C. | It increases CO2 content in the blood |
| D. | It is a reduction product of formaldehyde |
| Answer» C. It increases CO2 content in the blood | |
| 252. |
Ethyl alcohol exhibits acidic character on reacting with……. |
| A. | Acetic acid |
| B. | Sodium metal |
| C. | Hydrogen iodide |
| D. | Acidic potassium dichromate |
| Answer» C. Hydrogen iodide | |
| 253. |
The fermentation of starch to give alcohol occurs mainly with the help of ……… |
| A. | O2 |
| B. | Air |
| C. | CO2 |
| D. | Enzymes |
| Answer» E. | |
| 254. |
What is freon-12……. |
| A. | Pesticide |
| B. | Refrigerant |
| C. | Solvent |
| D. | Lubricant |
| Answer» C. Solvent | |
| 255. |
Of the five isomeric hexanes, the isomer which can give two monochlorinated compoundsis………….. |
| A. | n-hexane |
| B. | 2, 3-dimethylbutane |
| C. | 2, 2-dimethylbutane |
| D. | 2-methylpentane |
| Answer» C. 2, 2-dimethylbutane | |
| 256. |
Alkenes convert into alcohols by…… |
| A. | Hydrolysis by dil. Sulphuric acid |
| B. | Hydration of alkene by alkaline KMnO4 |
| C. | Hydrolysis by water vapours and conc. Sulphuric acid |
| D. | Hydration of alkene by aqueous KOH |
| Answer» C. Hydrolysis by water vapours and conc. Sulphuric acid | |
| 257. |
Which statement is not true concerning alkanes……….. |
| A. | Large number alkanes are soluble in water |
| B. | All alkanes have a lower density than water |
| C. | At room temperature some alkanes are liquids, some solids and some gases |
| D. | All alkanes burn |
| Answer» B. All alkanes have a lower density than water | |
| 258. |
The oxidation of toluene to benzaldehyde by chromyl chloride is called…….. |
| A. | Cannizzaro reaction |
| B. | Wurtz reaction |
| C. | Etard reaction |
| D. | Reimer-Tiemann reaction |
| Answer» D. Reimer-Tiemann reaction | |
| 259. |
With anhydrous zinc chloride, ethylene glycol gives……. |
| A. | Formaldehyde |
| B. | Acetylene |
| C. | Acetaldehyde |
| D. | Acetone |
| Answer» D. Acetone | |
| 260. |
Gasoline is the name of …………… |
| A. | Crude oil |
| B. | The gaseous constituents of petroleum |
| C. | The mixture of uncondensed gases produced in the distillation of crude oil |
| D. | The mixture of the residue and gas oil obtained in the distillation of crude oil |
| Answer» C. The mixture of uncondensed gases produced in the distillation of crude oil | |
| 261. |
The oxidation of benzyl chloride with lead nitrate gives…………… |
| A. | Benzyl alcohol |
| B. | Benzoic acid |
| C. | Benzaldehyde |
| D. | p –chlorobenzaldehyde |
| Answer» D. p –chlorobenzaldehyde | |
| 262. |
In reaction of alcohols with alkali metal, acid etc. which of the following alcohol will react fastest…. |
| A. | Secondary |
| B. | Tertiary |
| C. | Primary |
| D. | All equal |
| Answer» D. All equal | |
| 263. |
The reagent with which both aldehyde and acetone react easily is……………. |
| A. | Fehling's reagent |
| B. | Grignard reagent |
| C. | Schiff's reagent |
| D. | Tollen's reagent |
| Answer» C. Schiff's reagent | |
| 264. |
Acetaldehyde reacts with C2H5 MgCl the final product is………… |
| A. | An aldehyde |
| B. | A ketone |
| C. | A primary alcohol |
| D. | A secondary alcohol |
| Answer» E. | |
| 265. |
In the commercial gasolines, the type of hydrocarbons which are more desirable is……….. |
| A. | Branched hydrocarbon |
| B. | Straight-chain hydrocarbon |
| C. | Linear unsaturated hydrocarbon |
| D. | Toluene |
| Answer» B. Straight-chain hydrocarbon | |
| 266. |
Which of the following compounds does not contain an -OH group……….. |
| A. | Phenol |
| B. | Carboxylic acid |
| C. | Aldehydes |
| D. | Alcohols |
| Answer» D. Alcohols | |
| 267. |
Octane number has 0 value for………. |
| A. | iso-octane |
| B. | n-hexane |
| C. | n-heptane |
| D. | iso-heptane |
| Answer» D. iso-heptane | |
| 268. |
Which gives CH4 when treated with water…….. |
| A. | Silicon carbide |
| B. | Calcium carbide |
| C. | Aluminium carbide |
| D. | Iron carbide |
| Answer» D. Iron carbide | |
| 269. |
A compound, containing only carbon, hydrogen and oxygen, has a molecular weight of 44. Oncomplete oxidation it is converted into a compound of molecular weight 60. The original compound is ? |
| A. | An aldehyde |
| B. | An acid |
| C. | An alcohol |
| D. | an ether |
| Answer» B. An acid | |
| 270. |
Chloral is……….. |
| A. | CCl3CHO |
| B. | CCl3COCCH3 |
| C. | CCl3COCCl3 |
| D. | CCl3CH2OH |
| Answer» D. CCl3CH2OH | |
| 271. |
Which of the following fractions of petroleum refining contains kerosene ? (Boiling ranges in o C aregiven below) |
| A. | 40 – 80 |
| B. | 80 - 200 |
| C. | 200 - 300 |
| D. | Above 300 |
| Answer» D. Above 300 | |
| 272. |
Which of the following compounds is insoluble even in hot concentrated H2SO4……… |
| A. | Ethylene |
| B. | Benzene |
| C. | Hexane |
| D. | Aniline |
| Answer» D. Aniline | |
| 273. |
Which of the following is not characteristic of alcohols…… |
| A. | They are lighter than water |
| B. | Their boiling points rise fairly uniformly with increasing molecular weight |
| C. | Lower members are insoluble in water and organic solvents but solubility regularly increases with molecular weight |
| D. | Lower members have pleasant smell and burning taste, while higher members are odourless and tasteless |
| Answer» D. Lower members have pleasant smell and burning taste, while higher members are odourless and tasteless | |
| 274. |
Which of the following has maximum boiling point…………… |
| A. | iso-octane |
| B. | n-octane |
| C. | 2, 2, 3, 3-tetramethyl butane |
| D. | n-butane |
| Answer» C. 2, 2, 3, 3-tetramethyl butane | |
| 275. |
Which represents an alkane……… |
| A. | C5H8 |
| B. | C6H8 |
| C. | C9H10 |
| D. | C7H16 |
| Answer» E. | |
| 276. |
The preparation of ethane by electrolysis of aqueous solution of potassium acetate is called as……. |
| A. | Wurtz reaction |
| B. | Sabatier-Senderen's reaction |
| C. | Kolbe's synthesis |
| D. | Grignard reaction |
| Answer» D. Grignard reaction | |
| 277. |
Propane is obtained from propene, by which of the following methods………. |
| A. | Wurtz reaction |
| B. | Dehydrogenation |
| C. | Frankland reaction |
| D. | Catalytic hydrogenation |
| Answer» B. Dehydrogenation | |
| 278. |
At 530 K , glycerol reacts with oxalic acid to produce ……. |
| A. | Allyl alcohol |
| B. | Formic acid |
| C. | Glyceraldehyde |
| D. | Glycerol monooxalate |
| Answer» B. Formic acid | |
| 279. |
Which is used as an antifreeze……. |
| A. | Glycol |
| B. | Ethyl alcohol |
| C. | Water |
| D. | Methanol |
| Answer» B. Ethyl alcohol | |
| 280. |
To distinguish between formaldehyde and acetaldehyde, we require………. |
| A. | Tollen's reagent |
| B. | Fehling's solution |
| C. | Schiff's reagent |
| D. | Caustic soda solution |
| Answer» E. | |
| 281. |
Aldol condensation of acetaldehyde involves the formation of which of the following intermediate? |
| A. | Acetate ion |
| B. | A carbanion |
| C. | A carbonium ion |
| D. | A free radical |
| Answer» C. A carbonium ion | |
| 282. |
Which of the following has highest percentage of hydrogen……….. |
| A. | CH4 |
| B. | C2H4 |
| C. | C6H6 |
| D. | C2H2 |
| Answer» B. C2H4 | |
| 283. |
CH3 CO CH3 can be obtained by ……….. |
| A. | Heating acetaldehyde with methanol |
| B. | Oxidation of propyl alcohol |
| C. | Oxidation of isopropyl alcohol |
| D. | Reduction of propionic acid |
| Answer» D. Reduction of propionic acid | |
| 284. |
CH4 is formed when…………. |
| A. | Sodium acetate is heated with sodalime |
| B. | Iodomethane is reduced |
| C. | Aluminium carbide reacts with water |
| D. | All of these |
| Answer» E. | |
| 285. |
IUPAC name of CH3COCH3 is……….. |
| A. | Acetone |
| B. | 2-propanone |
| C. | Dimethyl ketone |
| D. | Propanal |
| Answer» C. Dimethyl ketone | |
| 286. |
Aldehydes are isomeric with……….. |
| A. | Ketones |
| B. | Ethers |
| C. | Alcohols |
| D. | Fatty acids |
| Answer» B. Ethers | |
| 287. |
Halogenation of alkanes is an example of……….. |
| A. | Electrophilic substitution |
| B. | Nucleophilic substitution |
| C. | Free-radical substitution |
| D. | Oxidation |
| Answer» D. Oxidation | |
| 288. |
A reaction between methyl magnesium bromide and ethyl alcohol gives………. |
| A. | Methane |
| B. | Ethane |
| C. | Propane |
| D. | Butane |
| Answer» B. Ethane | |
| 289. |
Acetaldehyde reacts with …………… |
| A. | Electrophiles only |
| B. | Nucleophiles only |
| C. | Free radicals only |
| D. | Both electrophiles and nucleophiles |
| Answer» C. Free radicals only | |
| 290. |
Which of the following is not linked with methane…………. |
| A. | Marsh gas |
| B. | Natural gas |
| C. | Producer gas |
| D. | Coal gas |
| Answer» D. Coal gas | |
| 291. |
Which one of the following compounds is prepared in the laboratory from benzene by a substitutionreaction……… |
| A. | Glyoxal |
| B. | Cyclohexane |
| C. | Acetophenone |
| D. | Hexabromo cyclohexane |
| Answer» D. Hexabromo cyclohexane | |
| 292. |
Which is the best antiknock compound or Which one of the following substances is used as anantiknock compound …………… |
| A. | Lead tetrachloride |
| B. | Lead acetate |
| C. | Zinc ethyl |
| D. | Tetraethyl lead (TEL) |
| Answer» E. | |
| 293. |
Acetophenone is prepared from |
| A. | Rosenmund reaction |
| B. | Sandmayer reaction |
| C. | Wurtz reaction |
| D. | Friedel craft reaction |
| Answer» E. | |
| 294. |
Acetaldehyde cannot show ……………. |
| A. | Iodoform test |
| B. | Lucas test |
| C. | Benedict's test |
| D. | Tollen's test |
| Answer» C. Benedict's test | |
| 295. |
Sodium ethoxide is a specific reagent for…………… |
| A. | Dehydration |
| B. | Dehydrogenation |
| C. | Dehydrohalogenation |
| D. | Dehalogenation |
| Answer» D. Dehalogenation | |
| 296. |
General formula of primary alcohol is ……. |
| A. | CHOH |
| B. | COH |
| C. | CH2OH |
| D. | COHOH |
| Answer» D. COHOH | |
| 297. |
Isomerism in saturated hydrocarbons is due to………….. |
| A. | Change in the valence of carbon |
| B. | Change in the ratio of elements in compounds |
| C. | Formation of branches in the chain of C atoms |
| D. | Formation of double bond |
| Answer» D. Formation of double bond | |
| 298. |
Aldol condensation will not be observed in………. |
| A. | Chloral |
| B. | Phenyl acetaldehyde |
| C. | Hexanal |
| D. | Ethanol |
| Answer» B. Phenyl acetaldehyde | |
| 299. |
The inorganic origin of petroleum is indicated by the fact that………….. |
| A. | Its constituents can be separated by fractional distillation |
| B. | Carbon and hydrocarbon can combine by absorption of solar energy to give hydrocarbons |
| C. | Petroleum contains traces of chlorophyll |
| D. | Oil fields are located with the help of seismograph |
| Answer» C. Petroleum contains traces of chlorophyll | |
| 300. |
Haloform test is given by the following substance…………… |
| A. | HCHO |
| B. | (CH3)2 CO |
| C. | CH3OCH3 |
| D. | CH3CH2Cl |
| Answer» C. CH3OCH3 | |