Screencast 23.1
https://www.youtube.com/watch?v=-cqh0nHTCdI
In this screencast, Andrew Parsons walks you through the formation of alcohols from reactions between organometallic reagents and either a ketone or aldehyde.

Screencast 23.2
https://www.youtube.com/watch?v=AAV37rPcqic
In this screencast, Andrew Parsons discusses why aldehydes and ketones need protecting and how conversion to an acetal can provide that protection.

Screencast 23.3
https://www.youtube.com/watch?v=RdxoScEm-sg
In this screencast, Andrew Parsons walks you through the steps involved in aldol condensations.