The major products P and Q formed in the following reaction sequence are

Concept: 

• 9-BBN  is used in Hydroboration oxidation reaction.
• Hydroboration is a chemical reaction that involves the addition of a boron atom and a hydrogen atom across a carbon-carbon double bond (alkene) or a carbon-carbon triple bond (alkyne). This reaction is widely used in organic synthesis to introduce boron-containing functional groups into organic molecules. The most common form of hydroboration is the "hydroboration-oxidation" reaction.
• The overall outcome of the hydroboration-oxidation reaction is the addition of a boron atom and a hydrogen atom to an alkene or alkyne, leading to the formation of an alcohol. 
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Explanation:

1. Hydroboration Reaction:

2. Oxidation:

Conclusion:

Hence, the major products form are (R)-alpine borane and (S)-deuterated phenyl methanol.