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245 questions found · practise this subject as a set Show 20 · 50 per page
#QuestionSubject and topicDifficulty
141 Why is chloroform stored in closed, dark-coloured bottles filled to the brim? Chemistry
Polyhalogen compounds		 Easy
142 What is the chemical formula of iodoform? Chemistry
Polyhalogen compounds		 Easy
143 Why was iodoform once used as an antiseptic? Chemistry
Polyhalogen compounds		 Medium
144 Why are freons harmful even though they are non-toxic and unreactive at ground level? Chemistry
Polyhalogen compounds		 Medium
145 Why does DDT become more concentrated in animals higher up a food chain? Chemistry
Polyhalogen compounds		 Hard
146 Which of these is a tertiary alcohol? Chemistry
Classification and nomenclature		 Easy
147 What is the IUPAC name of anisole, C₆H₅OCH₃? Chemistry
Classification and nomenclature		 Easy
148 What is the common name of benzene-1,3-diol? Chemistry
Classification and nomenclature		 Medium
149 Why is the C–O bond in phenol shorter than the C–O bond in methanol? Chemistry
Classification and nomenclature		 Medium
150 Why is the C–O–C bond angle in dimethyl ether slightly larger than the tetrahedral angle? Chemistry
Classification and nomenclature		 Hard
151 What is the main product of acid-catalysed hydration of propene? Chemistry
Preparation of alcohols and phenols		 Easy
152 Which pair of products is formed in the cumene process? Chemistry
Preparation of alcohols and phenols		 Easy
153 Which method converts propene into propan-1-ol? Chemistry
Preparation of alcohols and phenols		 Medium
154 Which carbonyl compound gives a primary alcohol other than methanol when treated with CH₃MgBr followed by hyd… Chemistry
Preparation of alcohols and phenols		 Medium
155 A student wants 2-methylpropan-2-ol using a Grignard reagent. Which combination is suitable? Chemistry
Preparation of alcohols and phenols		 Hard
156 Why does ethanol have a much higher boiling point than methoxymethane, although both are C₂H₆O? Chemistry
Properties of alcohols		 Easy
157 Which alcohol gives turbidity immediately with Lucas reagent at room temperature? Chemistry
Properties of alcohols		 Easy
158 What product is obtained when propan-2-ol vapour is passed over heated copper at 573 K? Chemistry
Properties of alcohols		 Medium
159 Which reagent oxidises a primary alcohol to an aldehyde without further oxidation to a carboxylic acid? Chemistry
Properties of alcohols		 Medium
160 Arrange methanol, propan-2-ol and 2-methylpropan-2-ol in decreasing order of acidity. Chemistry
Properties of alcohols		 Hard