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.
| 151. |
Which of the following terms best describes the following pair of molecules? |
| A. | Isomers |
| B. | Constitutional isomers |
| C. | Configurational isomers |
| D. | Geometrical isomers |
| Answer» E. | |
| 152. |
Furan on treatment with acid undergoes protonation and form________. |
| A. | Protonated furan |
| B. | Polymeric product |
| C. | Dihydro furan |
| D. | None of the above |
| Answer» C. Dihydro furan | |
| 153. |
Nitration of pyrrole is best carried out using: |
| A. | Acetyl nitrate |
| B. | Ammonium nitrate |
| C. | Concentrated nitric and sulphuric acid |
| D. | Nitric acid |
| Answer» B. Ammonium nitrate | |
| 154. |
Optically active compound can rotate_____ |
| A. | Ordinary light |
| B. | Plane polarized light |
| C. | Monochromatic light |
| D. | None of above |
| Answer» C. Monochromatic light | |
| 155. |
Electrophilic substitution in furan usually occurs at: |
| A. | Both the C2 and C3 atom |
| B. | The O atom |
| C. | The C2 atom |
| D. | The C3 atom |
| Answer» D. The C3 atom | |
| 156. |
Alcoholic fermentation is brought about by the action of |
| A. | CO2 |
| B. | O2 |
| C. | Invertase |
| D. | Yeast |
| Answer» E. | |
| 157. |
Ethyne on reaction with water in the presence of HgSO4 and H2SO4 gives………. |
| A. | Acetone |
| B. | Acetaldehyde |
| C. | Acetic acid |
| D. | Ethyl alcohol |
| Answer» C. Acetic acid | |
| 158. |
Which of the following will not give the iodoform test ? |
| A. | Acetophenone |
| B. | Ethanal |
| C. | Benzophenone |
| D. | Ethanol |
| Answer» D. Ethanol | |
| 159. |
Acetal is obtained by reacting in the presence of dry HCl and alcohol with………….. |
| A. | Aldehyde |
| B. | Ketone |
| C. | Ether |
| D. | Carboxylic acid |
| Answer» B. Ketone | |
| 160. |
A sample of gasoline contains 81% iso-octane and 19% nheptane. Its octane number will be…….. |
| A. | 19 |
| B. | 81 |
| C. | 100 |
| D. | 62 |
| Answer» C. 100 | |
| 161. |
Isopropyl alcohol on oxidation gives……. |
| A. | Acetone |
| B. | Acetaldehyde |
| C. | Ether |
| D. | Ethylene |
| Answer» B. Acetaldehyde | |
| 162. |
Iodoethane reacts with sodium in the presence of dry ether. The product is…….. |
| A. | Pentane |
| B. | Propane |
| C. | Butene |
| D. | Butane |
| Answer» E. | |
| 163. |
Aromatic aldehyde undergo disproportionation in presence of sodium or potassium hydroxide to givecorresponding alcohol and acid. The reaction is known as ………….. |
| A. | Wurtz's reaction |
| B. | Cannizzaro reaction |
| C. | Friedel-Craft's reaction |
| D. | Claisen reaction |
| Answer» C. Friedel-Craft's reaction | |
| 164. |
Which of the following organic compounds exhibits positive Fehling test as well as iodoformtest…………. |
| A. | Methanal |
| B. | Ethanol |
| C. | Propanone |
| D. | Ethanal |
| Answer» E. | |
| 165. |
The typical reactions of aldehyde is…………………. |
| A. | Electrophilic addition |
| B. | Nucleophilic substitution |
| C. | Nucleophilic addition |
| D. | Nucleophilic elimination |
| Answer» D. Nucleophilic elimination | |
| 166. |
In Wurtz reaction, the reagent used is……….. |
| A. | Na |
| B. | liquid NH3Na |
| C. | ether dry Na |
| D. | alcohol dry Na |
| Answer» D. alcohol dry Na | |
| 167. |
Which of the following will undergo aldol condensation……… |
| A. | Acetaldehyde |
| B. | Propanaldehyde |
| C. | Benzaldehyde |
| D. | Trideuteroacetaldehyde |
| Answer» B. Propanaldehyde | |
| 168. |
Which one of the following will produce a primary alcohol by reacting with CH3MgI…….. |
| A. | Acetone |
| B. | Methyl cyanide |
| C. | Ethylene oxide |
| D. | Ethyl acetate |
| Answer» D. Ethyl acetate | |
| 169. |
In order to make alcohol undrinkable pyridine and methanol are added to it. The resulting alcohol iscalled ……… |
| A. | Power alcohol |
| B. | Proof spirit |
| C. | Denatured spirit |
| D. | Poison alcohol |
| Answer» D. Poison alcohol | |
| 170. |
Which of the following aldehydes give red precipitate with Fehling solution ? |
| A. | Benzaldehyde |
| B. | Salicylaldehyde |
| C. | Acetaldehyde |
| D. | None of these |
| Answer» D. None of these | |
| 171. |
When ethyl alcohol reacts with acetic acid, the products formed are….. |
| A. | Sodium ethoxide + hydrogen |
| B. | Ethyl acetate + water |
| C. | Ethyl acetate + soap |
| D. | Ethyl alcohol + water |
| Answer» C. Ethyl acetate + soap | |
| 172. |
. Which of the following shows only one brominated compound………… |
| A. | Butene-2 |
| B. | 2, 2-dimethylpropane |
| C. | Butyne-1 |
| D. | Butanol-3 |
| Answer» C. Butyne-1 | |
| 173. |
Enol content is highest in………….. |
| A. | Acetone |
| B. | Acetophenone |
| C. | Acetic acid |
| D. | Acetyl acetone |
| Answer» E. | |
| 174. |
Rectified spirit is a mixture of ………. |
| A. | 95% ethyl alcohol + 5% water |
| B. | 94% ethyl alcohol + 4.53% water |
| C. | 94.4% ethyl alcohol + 5.43 % water |
| D. | 95.57% ethyl alcohol + 4.43% water |
| Answer» E. | |
| 175. |
Which of the following has highest octane number………… |
| A. | n-hexane |
| B. | n-heptane |
| C. | n-pentane |
| D. | 2, 2, 4-trimethyl pentane |
| Answer» E. | |
| 176. |
The reagent which easily reacts with ethanol and propanol is…… |
| A. | Fehling solution |
| B. | Grignard reagent |
| C. | Schiff's reagent |
| D. | Tollen's reagent |
| Answer» C. Schiff's reagent | |
| 177. |
As the number of carbon atoms in a chain increases the boiling point of alkanes………. |
| A. | Increases |
| B. | Decreases |
| C. | Remains same |
| D. | May increase or decrease |
| Answer» B. Decreases | |
| 178. |
When petroleum is heated the vapours contain mainly…………. |
| A. | Kerosene |
| B. | Petroleum ether |
| C. | Diesel |
| D. | Machine oil |
| Answer» E. | |
| 179. |
Reduction ofCO to 2CH can be carried out with………… |
| A. | Catalytic reduction |
| B. | Na/ C2 H5 OH |
| C. | Wolf-Kischner reduction |
| D. | LiAlH4 |
| Answer» D. LiAlH4 | |
| 180. |
Petroleum consists mainly of………… |
| A. | Aliphatic hydrocarbons |
| B. | Aromatic hydrocarbons |
| C. | Aliphatic alcohols |
| D. | None of these |
| Answer» B. Aromatic hydrocarbons | |
| 181. |
Glycerol as a triester present in ……. |
| A. | Petroleum |
| B. | Kerosene |
| C. | Vegetable oil and fat |
| D. | Naphtha |
| Answer» D. Naphtha | |
| 182. |
The reagent used in Gatterman Koch aldehyde synthesis is……….. |
| A. | Pb/ BaSO4 |
| B. | Alkaline KMnO4 |
| C. | Acidic KMnO4 |
| D. | CO + HCl |
| Answer» E. | |
| 183. |
Butane-2-ol is ……. |
| A. | Primary alcohol |
| B. | Secondary alcohol |
| C. | Tertiary alcohol |
| D. | Aldehyde |
| Answer» C. Tertiary alcohol | |
| 184. |
Boiling point of acetone is………….. |
| A. | 56oC |
| B. | 60 oC |
| C. | 100o C |
| D. | 90oC |
| Answer» B. 60 oC | |
| 185. |
During reaction of benzaldehyde with alkali one of the product is………… |
| A. | Phenol |
| B. | Benzyl alcohol |
| C. | Benzene |
| D. | Benzophenone |
| Answer» C. Benzene | |
| 186. |
Ketones where R =R1=1 alkyl group. It can be obtained in one step by |
| A. | Hydrolysis of esters |
| B. | Oxidation of primary alcohol |
| C. | Oxidation of secondary alcohol |
| D. | Reaction of acid halide with alcohols |
| Answer» D. Reaction of acid halide with alcohols | |
| 187. |
Fehling's test is positive for………. |
| A. | Acetaldehyde |
| B. | Benzaldehyde |
| C. | Ether |
| D. | Alcohol |
| Answer» B. Benzaldehyde | |
| 188. |
On reaction with hot conc. H2SO4 which one of the following compounds loses a molecule ofwater…. |
| A. | CH3COCH3 |
| B. | CH3COOH |
| C. | CH3OCH3 |
| D. | CH3CH2OH |
| Answer» E. | |
| 189. |
Which of the following is not an endothermic reaction………… |
| A. | Dehydrogenation |
| B. | Ethane to ethene |
| C. | Combustion of propane |
| D. | Change of chlorine molecule into chlorine atoms |
| Answer» D. Change of chlorine molecule into chlorine atoms | |
| 190. |
Which of the following are produced from coaltar……….. |
| A. | Synthetic dyes |
| B. | Drugs |
| C. | Perfumes |
| D. | All the three |
| Answer» E. | |
| 191. |
The addition of tetraethyl lead to petrol………… |
| A. | Lowers its octane number |
| B. | Raises its octane number |
| C. | May raise or lower the octane number |
| D. | Has no effect on octane number |
| Answer» C. May raise or lower the octane number | |
| 192. |
Benzaldehyde + Sodium hydroxide |
| A. | Benzyl alcohol |
| B. | Benzoic alcohol |
| C. | Hydrobenzamide |
| D. | Cinnamic acid |
| Answer» B. Benzoic alcohol | |
| 193. |
Wine (alcoholic beverages) contains ……… |
| A. | CH3OH |
| B. | Glycerol |
| C. | C2H5OH |
| D. | 2-propanol |
| Answer» D. 2-propanol | |
| 194. |
When sodium propionate is heated with soda lime, the main product is………….. |
| A. | Ethane |
| B. | Methane |
| C. | Propane |
| D. | Butane |
| Answer» B. Methane | |
| 195. |
Propene is the product obtained by dehydrogenation of ……. |
| A. | 2-propanol |
| B. | 1-propanol |
| C. | Propanal |
| D. | n -propyl alcohol |
| Answer» B. 1-propanol | |
| 196. |
Acetophenone is prepared by the reaction of which of the following in the presence of AlCl3catalyst…….. |
| A. | Phenol and acetic acid |
| B. | Benzene and acetone |
| C. | Benzene and acetyl chloride |
| D. | Phenol and acetone |
| Answer» D. Phenol and acetone | |
| 197. |
Name the hydrocarbon that is a liquid at STP………. |
| A. | Ethane |
| B. | Propane |
| C. | n-butane |
| D. | n-pentane |
| Answer» E. | |
| 198. |
Liquor poisoning is due to ……. |
| A. | Presence of bad compound in liquor |
| B. | Presence of methyl alcohol |
| C. | Presence of ethyl alcohol |
| D. | Presence of carbonic acid |
| Answer» C. Presence of ethyl alcohol | |
| 199. |
A mixture of ethyl iodide and n-propyl iodide is subjected to Wurtz reaction. The hydrocarbon that will not be formed is………….. |
| A. | n-butane |
| B. | n-propane |
| C. | n-pentane |
| D. | n-hexan |
| Answer» C. n-pentane | |
| 200. |
Which of the following is not formed by the reaction of Cl2 on CH4 in sunlight………. |
| A. | CHCl3 |
| B. | CH3Cl |
| C. | CH3CH3 |
| D. | CH3CH2CH3 |
| Answer» E. | |