| 2151 |
Which alcohol gives turbidity immediately with Lucas reagent at room temperature? |
Chemistry
Properties of alcohols |
Easy |
| 2152 |
What product is obtained when propan-2-ol vapour is passed over heated copper at 573 K? |
Chemistry
Properties of alcohols |
Medium |
| 2153 |
Which reagent oxidises a primary alcohol to an aldehyde without further oxidation to a carboxylic acid? |
Chemistry
Properties of alcohols |
Medium |
| 2154 |
Arrange methanol, propan-2-ol and 2-methylpropan-2-ol in decreasing order of acidity. |
Chemistry
Properties of alcohols |
Hard |
| 2155 |
What is formed when phenol is treated with bromine water? |
Chemistry
Properties of phenols |
Easy |
| 2156 |
Which product is obtained in the Reimer–Tiemann reaction of phenol? |
Chemistry
Properties of phenols |
Easy |
| 2157 |
Why is phenol more acidic than ethanol? |
Chemistry
Properties of phenols |
Medium |
| 2158 |
Which compound is the most acidic? |
Chemistry
Properties of phenols |
Medium |
| 2159 |
Why can o-nitrophenol be separated from p-nitrophenol by steam distillation? |
Chemistry
Properties of phenols |
Hard |
| 2160 |
What is the reaction of an alkyl halide with a sodium alkoxide to form an ether called? |
Chemistry
Ethers |
Easy |
| 2161 |
What are the products when anisole is heated with HI? |
Chemistry
Ethers |
Easy |
| 2162 |
Why do ethers have much lower boiling points than isomeric alcohols? |
Chemistry
Ethers |
Medium |
| 2163 |
Which pair of reactants is best for preparing tert-butyl methyl ether by Williamson synthesis? |
Chemistry
Ethers |
Medium |
| 2164 |
What are the main products when methyl tert-butyl ether, (CH₃)₃C–O–CH₃, is treated with HI? |
Chemistry
Ethers |
Hard |
| 2165 |
Why is methanol called "wood spirit"? |
Chemistry
Commercially important alcohols |
Easy |
| 2166 |
Which enzyme in yeast converts glucose into ethanol and carbon dioxide? |
Chemistry
Commercially important alcohols |
Easy |
| 2167 |
What substances are added to make denatured alcohol? |
Chemistry
Commercially important alcohols |
Medium |
| 2168 |
Why is air excluded during the fermentation of sugar to ethanol? |
Chemistry
Commercially important alcohols |
Medium |
| 2169 |
Methanol is manufactured industrially by which reaction? |
Chemistry
Commercially important alcohols |
Hard |
| 2170 |
What is the hybridisation of the carbonyl carbon atom in propanone? |
Chemistry
The carbonyl group |
Easy |
| 2171 |
What is the IUPAC name of CH₃CH₂COCH₃? |
Chemistry
The carbonyl group |
Easy |
| 2172 |
Why do nucleophiles attack the carbon atom of a carbonyl group? |
Chemistry
The carbonyl group |
Medium |
| 2173 |
What is the IUPAC name of CH₃CH(CH₃)CH₂CHO? |
Chemistry
The carbonyl group |
Medium |
| 2174 |
Which compound is named β-chlorobutyraldehyde in the common system? |
Chemistry
The carbonyl group |
Hard |
| 2175 |
Which reagent converts benzoyl chloride into benzaldehyde? |
Chemistry
Preparation of aldehydes and ketones |
Easy |
| 2176 |
What is the product when ethyne is passed into dilute H₂SO₄ containing HgSO₄? |
Chemistry
Preparation of aldehydes and ketones |
Easy |
| 2177 |
In the Etard reaction, toluene is converted into benzaldehyde using which reagent? |
Chemistry
Preparation of aldehydes and ketones |
Medium |
| 2178 |
Which combination gives propanone after hydrolysis? |
Chemistry
Preparation of aldehydes and ketones |
Medium |
| 2179 |
Ozonolysis of an alkene followed by Zn/H₂O gives only propanone. What is the alkene? |
Chemistry
Preparation of aldehydes and ketones |
Hard |
| 2180 |
Which compound gives a positive iodoform test? |
Chemistry
Reactions of aldehydes and ketones |
Easy |
| 2181 |
Which reagent distinguishes ethanal from propanone? |
Chemistry
Reactions of aldehydes and ketones |
Easy |
| 2182 |
Which aldehyde undergoes the Cannizzaro reaction with concentrated NaOH? |
Chemistry
Reactions of aldehydes and ketones |
Medium |
| 2183 |
What mass of silver (Ag = 108 g mol⁻¹) is deposited when 0.1 mol of ethanal is fully oxidised by Tollens' rea… |
Chemistry
Reactions of aldehydes and ketones |
Medium |
| 2184 |
What is the final product when ethanal is warmed with dilute NaOH? |
Chemistry
Reactions of aldehydes and ketones |
Hard |
| 2185 |
Which test distinguishes ethanoic acid from phenol? |
Chemistry
Carboxylic acids |
Easy |
| 2186 |
What product is obtained when sodium propanoate is heated with soda-lime? |
Chemistry
Carboxylic acids |
Easy |
| 2187 |
Which of these acids is the strongest? |
Chemistry
Carboxylic acids |
Medium |
| 2188 |
What mass of CO₂ is released when 6.0 g of ethanoic acid reacts completely with excess NaHCO₃? |
Chemistry
Carboxylic acids |
Medium |
| 2189 |
Ethylbenzene is heated with alkaline KMnO₄ and then acidified. What is the product? |
Chemistry
Carboxylic acids |
Hard |
| 2190 |
Formalin, used to preserve biological specimens, is an aqueous solution of which compound? |
Chemistry
Uses |
Easy |
| 2191 |
Which compound is commonly used as a food preservative? |
Chemistry
Uses |
Easy |
| 2192 |
Which carboxylic acid is a monomer used in the manufacture of nylon-6,6? |
Chemistry
Uses |
Medium |
| 2193 |
A factory needs a carbonyl compound to react with phenol to make Bakelite. Which should it use? |
Chemistry
Uses |
Medium |
| 2194 |
Which acid is used in the leather, textile and electroplating industries? |
Chemistry
Uses |
Hard |
| 2195 |
What is the shape of the trimethylamine molecule around the nitrogen atom? |
Chemistry
Structure, classification and nomenclature |
Easy |
| 2196 |
Which compound is a secondary amine? |
Chemistry
Structure, classification and nomenclature |
Easy |
| 2197 |
What is the IUPAC name of CH₃NHCH₂CH₃? |
Chemistry
Structure, classification and nomenclature |
Medium |
| 2198 |
Classify 2-methylpropan-2-amine, (CH₃)₃C–NH₂. |
Chemistry
Structure, classification and nomenclature |
Medium |
| 2199 |
What is the IUPAC name of (CH₃)₂N–CH₂CH₂CH₃? |
Chemistry
Structure, classification and nomenclature |
Hard |
| 2200 |
Which test gives a foul-smelling product only with primary amines? |
Chemistry
Preparation and properties |
Easy |