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245 questions found · practise this subject as a set Show 20 · 50 per page

#	Question	Subject and topic	Difficulty
201	What is the shape of the trimethylamine molecule around the nitrogen atom?	Chemistry Structure, classification and nomenclature	Easy
202	Which compound is a secondary amine?	Chemistry Structure, classification and nomenclature	Easy
203	What is the IUPAC name of CH₃NHCH₂CH₃?	Chemistry Structure, classification and nomenclature	Medium
204	Classify 2-methylpropan-2-amine, (CH₃)₃C–NH₂.	Chemistry Structure, classification and nomenclature	Medium
205	What is the IUPAC name of (CH₃)₂N–CH₂CH₂CH₃?	Chemistry Structure, classification and nomenclature	Hard
206	Which test gives a foul-smelling product only with primary amines?	Chemistry Preparation and properties	Easy
207	Which method gives only primary aliphatic amines, free from 2° and 3° amines?	Chemistry Preparation and properties	Easy
208	Which is the strongest base in aqueous solution?	Chemistry Preparation and properties	Medium
209	What mass of methanamine (molar mass 31 g mol⁻¹) is formed from 5.9 g of ethanamide (molar mass 59 g mol⁻¹) b…	Chemistry Preparation and properties	Medium
210	An amine reacts with benzenesulphonyl chloride to give a product that is insoluble in aqueous KOH. What kind …	Chemistry Preparation and properties	Hard
211	At what temperature range is aniline usually diazotised?	Chemistry Diazonium salts	Easy
212	Which reagent converts benzenediazonium chloride into iodobenzene?	Chemistry Diazonium salts	Easy
213	Which product is formed when benzenediazonium chloride is treated with H₃PO₂?	Chemistry Diazonium salts	Medium
214	What is formed when benzenediazonium chloride reacts with phenol in alkaline medium?	Chemistry Diazonium salts	Medium
215	Which sequence is best for preparing fluorobenzene from aniline?	Chemistry Diazonium salts	Hard
216	Which of these is a non-reducing sugar?	Chemistry Carbohydrates	Easy
217	Which polysaccharide is called animal starch?	Chemistry Carbohydrates	Easy
218	Prolonged heating of glucose with HI gives n-hexane. What does this show?	Chemistry Carbohydrates	Medium
219	What is the molar mass of glucose pentaacetate, formed when all five –OH groups of glucose (180 g mol⁻¹) are …	Chemistry Carbohydrates	Medium
220	34.2 g of sucrose (342 g mol⁻¹) is completely hydrolysed. What mass of glucose is formed?	Chemistry Carbohydrates	Hard
221	Which amino acid is optically inactive?	Chemistry Amino acids and proteins	Easy
222	How many peptide bonds are present in a pentapeptide?	Chemistry Amino acids and proteins	Easy
223	Which level of protein structure is NOT affected when egg white is boiled?	Chemistry Amino acids and proteins	Medium
224	How many different tripeptides can be made from glycine, alanine and valine if each is used exactly once?	Chemistry Amino acids and proteins	Medium
225	What holds the α-helix of a protein in shape?	Chemistry Amino acids and proteins	Hard
226	Most enzymes are chemically which type of substance?	Chemistry Enzymes	Easy
227	Which enzyme hydrolyses maltose into glucose?	Chemistry Enzymes	Easy
228	How does an enzyme increase the rate of a biochemical reaction?	Chemistry Enzymes	Medium
229	Why does an enzyme stop working when it is heated strongly?	Chemistry Enzymes	Medium
230	An enzyme acts on sucrose but not on lactose, though both are disaccharides. Which idea best explains this?	Chemistry Enzymes	Hard
231	Deficiency of which vitamin causes scurvy?	Chemistry Vitamins	Easy
232	Which set contains only fat-soluble vitamins?	Chemistry Vitamins	Easy
233	Why must vitamin C be included in the diet regularly?	Chemistry Vitamins	Medium
234	A patient's blood takes unusually long to clot. A deficiency of which vitamin is most likely?	Chemistry Vitamins	Medium
235	Which pairing of vitamin and deficiency disease is correct?	Chemistry Vitamins	Hard
236	Which base is found in RNA but not in DNA?	Chemistry Nucleic acids	Easy
237	What is the difference between a nucleoside and a nucleotide?	Chemistry Nucleic acids	Easy
238	A sample of double-stranded DNA contains 30% adenine. What percentage of guanine does it contain?	Chemistry Nucleic acids	Medium
239	Which sugar is present in DNA?	Chemistry Nucleic acids	Medium
240	Which statement about the DNA double helix is correct?	Chemistry Nucleic acids	Hard
241	Chemically, insulin belongs to which class of hormones?	Chemistry Hormones	Easy
242	Which hormone raises the level of glucose in the blood?	Chemistry Hormones	Easy
243	Thyroxine is an iodinated derivative of which amino acid?	Chemistry Hormones	Medium
244	Which group of hormones controls the excretion of water and salt by the kidney?	Chemistry Hormones	Medium
245	In a region where people regularly use salt without added iodide, many develop an enlarged thyroid gland. Wha…	Chemistry Hormones	Hard