Methylphosphine (CH3PH2\text{CH}_3\text{PH}_2CH3PH2) can be represented as RPH2\text{RPH}_2RPH2 and its protonated form, the methylphosphonium ion ([CH3PH3]+[\text{CH}_3\text{PH}_3]^+[CH3PH3]+), can be represented as [RPH3]+[\text{RPH}_3]^+[RPH3]+.
Describe or draw the three-dimensional shapes around the phosphorus atom in RPH2\text{RPH}_2RPH2 and in [RPH3]+[\text{RPH}_3]^+[RPH3]+. Include any lone pairs on the phosphorus atom.
State whether the H−P−H\text{H}-\text{P}-\text{H}H−P−H bond angle in RPH2\text{RPH}_2RPH2 is greater than, the same as, or smaller than that in [RPH3]+[\text{RPH}_3]^+[RPH3]+.
Explain your answer in terms of electron pair repulsion theory.
54 exam-style questions on AQA A Level Chemistry Bonding, covering Ionic bonding, Nature of covalent and dative covalent bonds, Metallic bonding, Bonding and physical properties, Shapes of simple molecules and ions, Bond polarity, and Forces between molecules. Each one has a worked solution and a mark scheme showing where the marks go.