Chirality

[chupa chups]

Hi all,

I just came up with a question while watching Chad's videos...
Do the 4 different substituents on a chiral carbon include lone pairs like a sulfur does??
Don't they readily interconvert with other substituents? I've never thought about this before...so I'm kinda confused... Can anyone help me with this?

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[chupa chups]

Thank you! I totally get it now=)