MCQOPTIONS
Saved Bookmarks
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.
| 201. |
A compound X with molecular formula C3H8O can be oxidised to a compound Y with the molecularformula C3H6O2 X is most likely to be ….. |
| A. | Primary alcohol |
| B. | Secondary alcohol |
| C. | Aldehyde |
| D. | Ketone |
| Answer» B. Secondary alcohol | |
| 202. |
Paraffin wax is……….. |
| A. | Ester |
| B. | Alcohol |
| C. | Unsaturated hydrocarbon |
| D. | Saturated Hydrocrabon |
| Answer» E. | |
| 203. |
Which of the following does not turn Schiff's reagent to pink………… |
| A. | Formaldehyde |
| B. | Benzaldehyde |
| C. | Acetone |
| D. | Acetaldehyde |
| Answer» D. Acetaldehyde | |
| 204. |
The petrol having octane number 80 has………… |
| A. | 20% normal heptane + 80% iso-octane |
| B. | 80% normal heptane + 20% iso-octane |
| C. | 20% normal heptane + 80% normal octane |
| D. | 80% normal heptane + 20% normal octane |
| Answer» B. 80% normal heptane + 20% iso-octane | |
| 205. |
Which of the following is a mixed ketone ……….. |
| A. | Pentanone |
| B. | Acetophenone |
| C. | Benzophenone |
| D. | Butanone |
| Answer» B. Acetophenone | |
| 206. |
Glycerol is not used in which of following cases……. |
| A. | Explosive making |
| B. | Shaving soap making |
| C. | As an antifreeze for water |
| D. | As an antiseptic agent |
| Answer» E. | |
| 207. |
Aqueous solution of the following compound on electrolysis gives ethane………. |
| A. | Acetic acid |
| B. | Acetamide |
| C. | Potassium acetate |
| D. | Ethyl acetate |
| Answer» D. Ethyl acetate | |
| 208. |
Which is primary alcohol……. |
| A. | Butane-2-ol |
| B. | Butane-1-ol |
| C. | Propane-2-ol |
| D. | Isopropyl alcohol |
| Answer» C. Propane-2-ol | |
| 209. |
In alkanes, the bond angle is…….. |
| A. | 109.5 o |
| B. | 109 o |
| C. | 120 o |
| D. | 180 o |
| Answer» B. 109 o | |
| 210. |
On heating glycerol with conc. H2SO4 a compound is obtained which has a bad odour. The compoundis….. |
| A. | Glycerol sulphate |
| B. | Acrolein |
| C. | Formic acid |
| D. | Allyl alcohol |
| Answer» C. Formic acid | |
| 211. |
Glycerol is used in the manufacture of |
| A. | Dynamite |
| B. | Varnish |
| C. | Paints |
| D. | Soft drinks |
| Answer» B. Varnish | |
| 212. |
Formation of alkane by the action of Zn on alkyl halide is called |
| A. | Frankland's reaction |
| B. | Wurtz reaction |
| C. | Cannizzaro reaction |
| D. | Kolbe's reaction |
| Answer» B. Wurtz reaction | |
| 213. |
The process of manufacture of absolute alcohol from rectified spirit is……. |
| A. | Fractional distillation |
| B. | Steam distillation |
| C. | Azeotropic distillation |
| D. | Vacuum distillation |
| Answer» D. Vacuum distillation | |
| 214. |
Which one of the following reacts with HCN and Tollen's reagent, but is not oxidised by Fehling'ssolution…………… |
| A. | Methanal |
| B. | Ethanal |
| C. | Benzaldehyde |
| D. | Acetone |
| Answer» D. Acetone | |
| 215. |
Which of the following does not give yellow precipitate with KINaOH………… |
| A. | Acetone |
| B. | Acetaldehyde |
| C. | Benzaldehyde |
| D. | Acetophenone |
| Answer» D. Acetophenone | |
| 216. |
Iso-octane is mixed to the petrol…………. |
| A. | To precipitate inorganic substances |
| B. | To prevent freezing of petrol |
| C. | To increase boiling point of petrol |
| D. | As an antiknock |
| Answer» E. | |
| 217. |
Dry heating of calcium acetate gives |
| A. | Acetaldehyde |
| B. | Ethane |
| C. | Acetic acid |
| D. | Acetone |
| Answer» E. | |
| 218. |
Amongst the following, HBr reacts fastest with……. |
| A. | Propane-1-ol |
| B. | Propane-2-ol |
| C. | 2-methyl propane-1-ol |
| D. | 2-methyl propane-2-ol |
| Answer» E. | |
| 219. |
For C2H5 CHO which of the following is incorrect………. |
| A. | On oxidation it yields benzoic acid |
| B. | It is used in perfumery |
| C. | It is an aromatic aldehyde |
| D. | On reduction yields phenol |
| Answer» E. | |
| 220. |
The order of appearance of the following with rising temperature during the refining of crude oil is…..…...... |
| A. | Kerosene oil, gasoline, diesel |
| B. | Diesel, gasoline, kerosene oil |
| C. | Gasoline, diesel, kerosene oil |
| D. | Gasoline, kerosene oil, diesel |
| Answer» E. | |
| 221. |
The natural petroleum contains…………. |
| A. | Saturated hydrocarbons |
| B. | Cyclic saturated hydrocarbons |
| C. | Compounds of sulphur |
| D. | All of these |
| Answer» E. | |
| 222. |
2-Methylbutane on reacting with bromine in the presence of sunlight gives mainly…….. |
| A. | 1-bromo-2-methylbutane |
| B. | 2-bromo-2-methylbutane |
| C. | 2-bromo-3-methylbutane |
| D. | 1-bromo-3-methylbutane |
| Answer» C. 2-bromo-3-methylbutane | |
| 223. |
The product formed in aldol condensation is……………. |
| A. | Beta hydroxy acid |
| B. | Beta hydroxy aldehyde or ketone |
| C. | Alpha, beta unsaturated ester |
| D. | Alpha, hydroxy aldehyde or ketone |
| Answer» C. Alpha, beta unsaturated ester | |
| 224. |
On mixing tetraethyl lead to gasoline available at petrol pumps………….. |
| A. | Calorific value of the fuel increases |
| B. | Odour diminishes |
| C. | Less smoke is obtained on combustion |
| D. | Antiknock property of fuel increases |
| Answer» E. | |
| 225. |
Isopropyl alcohol on oxidation forms…… |
| A. | Acetone |
| B. | Ether |
| C. | Ethylene |
| D. | Acetaldehyde |
| Answer» B. Ether | |
| 226. |
Gasoline is a mixture of alkanes with the number of carbon atoms ……………. |
| A. | C3 + C5 |
| B. | C5 + C6 |
| C. | C6 + C8 |
| D. | C7 + C9 |
| Answer» E. | |
| 227. |
Water gas is……….. |
| A. | CO + CO2 |
| B. | CO + N2 |
| C. | CO + H2 |
| D. | CO + N2 + H2 |
| Answer» D. CO + N2 + H2 | |
| 228. |
The final product formed when acetaldehyde is reduced with sodium and alcohol is………… |
| A. | Ethylene |
| B. | Ethyl alcohol |
| C. | Ethene |
| D. | All of these |
| Answer» C. Ethene | |
| 229. |
In which of the following reaction new carbon carbon bond is not formed? |
| A. | Cannizzaro reaction |
| B. | Friedel craft reaction |
| C. | Wurtz reaction |
| D. | Aldol condensation |
| Answer» B. Friedel craft reaction | |
| 230. |
Aldehyde turns pink with …………. |
| A. | Benedict solution |
| B. | Schiff reagent |
| C. | Fehling solution |
| D. | Tollen's reagent |
| Answer» C. Fehling solution | |
| 231. |
Which of the following does not decolourise bromine solution in carbon disulphide……….. |
| A. | Acetylene |
| B. | Propene |
| C. | Ethane |
| D. | Propyne |
| Answer» D. Propyne | |
| 232. |
Ethyl alcohol is industrially prepared from ethylene by…….. |
| A. | Permanganate oxidation |
| B. | Catalytic reduction |
| C. | Absorbing in H2SO4 followed by hydrolysis |
| D. | Fermentation |
| Answer» D. Fermentation | |
| 233. |
Which compound is not inflammable……….. |
| A. | CCl4 |
| B. | C2H5OH |
| C. | CH4 |
| D. | C6H6 |
| Answer» B. C2H5OH | |
| 234. |
Which one gives only one monosubstitution product on chlorination……….. |
| A. | n-pentane |
| B. | (b) Neopentane |
| C. | (c) Isopentane |
| D. | (d) n-butane |
| Answer» C. (c) Isopentane | |
| 235. |
In the reaction CH3- Br+ 2Na+ Br-CH3 , the product called …….. |
| A. | Wurtz reaction |
| B. | Aldol condensation |
| C. | Perkin’s reaction |
| D. | Levit reaction |
| Answer» B. Aldol condensation | |
| 236. |
Most of the hydrocarbons from petroleum are obtained by……………. |
| A. | Fractional distillation |
| B. | Fractional crystallization |
| C. | Vaporization |
| D. | Polymerization |
| Answer» B. Fractional crystallization | |
| 237. |
The product formed by the reaction of chlorine with benzaldehyde in the absence of a catalystis………….. |
| A. | Chlorobenzene |
| B. | Benzyl chloride |
| C. | Benzoyl Chloride |
| D. | o –Chlorobenzaldehyde |
| Answer» D. o –Chlorobenzaldehyde | |
| 238. |
Kerosene is a mixture of…………. |
| A. | Alkanes |
| B. | Aromatic compounds |
| C. | Alcohols |
| D. | Aliphatic acids |
| Answer» C. Alcohols | |
| 239. |
By Wurtz reaction, a mixture of methyliodide and ethyliodide gives…………. |
| A. | Butane |
| B. | Ethane |
| C. | Propane |
| D. | A mixture of the above three |
| Answer» E. | |
| 240. |
: Power alcohol is …… |
| A. | An alcohol of 95% purity |
| B. | A mixture of petrol hydrocarbons and ethanol |
| C. | Rectified spirit |
| D. | A mixture of methanol and ethanol |
| Answer» C. Rectified spirit | |
| 241. |
: In cold countries ethylene glycol is added to water in the radiators to |
| A. | Bring down the specific heat of water |
| B. | Lower the viscosity |
| C. | Reduce the viscosity |
| D. | Make water a better lubricant |
| Answer» B. Lower the viscosity | |
| 242. |
Methanol and ethanol are distinguished by the……. |
| A. | Action of HCl |
| B. | Iodoform test |
| C. | Solubility in water |
| D. | Sodium |
| Answer» C. Solubility in water | |
| 243. |
Acetaldehyde and acetone can be distinguished by…………… |
| A. | Molisch test |
| B. | Bromoform test |
| C. | Solubility in water |
| D. | Tollen's test |
| Answer» E. | |
| 244. |
When rectified spirit and benzene are distilled together, the first fraction obtained is…… |
| A. | A ternary azeotrope |
| B. | Absolute alcohol |
| C. | A binary azeotrope |
| D. | Denatured spirit |
| Answer» B. Absolute alcohol | |
| 245. |
Which of the following will have least hindered rotation about carbon-carbon bond………… |
| A. | Ethane |
| B. | Ethylene |
| C. | Acetylene |
| D. | Hexachloroethane |
| Answer» B. Ethylene | |
| 246. |
Which of the following cycloalkane gives open chain compound, when reacts withbromine……….. |
| A. | Cyclopropane |
| B. | Cyclopentane |
| C. | Cyclohexane |
| D. | Cyclo-octane |
| Answer» B. Cyclopentane | |
| 247. |
Alcohols combine with acetylene in the presence of mercury compounds as catalyst to form……. |
| A. | Acetals |
| B. | Xanthates |
| C. | Vinyl ethers |
| D. | None of the above |
| Answer» B. Xanthates | |
| 248. |
LPG is a mixture of…………. |
| A. | C6H12+ C6H6 |
| B. | C4H10+ C3H8 |
| C. | C2H4 + C2H2 |
| D. | C2H4 + CH4 |
| Answer» C. C2H4 + C2H2 | |
| 249. |
Which of the following is oxidised by KMnO4 |
| A. | Methane |
| B. | Pentane |
| C. | Isobutane |
| D. | Neopentane |
| Answer» D. Neopentane | |
| 250. |
Glycerol reacts with potassium bisulphate to produce ………… |
| A. | Allyl iodide |
| B. | Allyl sulphate |
| C. | Acryl aldehyde |
| D. | Glycerol trisulphate |
| Answer» D. Glycerol trisulphate | |