Chemistry 9701/22 May June 2021 | Cambridge AS Level Past Papers With Mark Scheme

1. Reaction of Group 2 metal bromides with silver nitrate, chlorine gas, and heat; identification of halide ions in compounds using reagents and characteristic observations.

2. Analysis of bonding and structure in lithium sulfide, coordinate bonding in CO, ideal gas behavior assumptions, and intermolecular force types in CO and N₂ gases.

3. Reaction rate determination involving 2-bromo-2-methylpropane and NaOH; activation energy influence, reaction mechanisms, and halide reactivity comparisons.

4. Structural isomer identification, stereoisomerism in hydrocarbons, carbocation stability analysis for HBr addition, and sulfuric acid's catalytic role in dehydration reactions.

5. Secondary alcohol reactions with PBr₃ and subsequent steps involving cyanide addition and hydrolysis; analysis of infrared spectra for functional group identification in intermediate compounds.

6. Organic transformation mechanisms, carbocation stability explanations, and advanced spectroscopy applications to deduce molecular identities and reaction intermediates.