#59 ochem destroyer

[Pentako]

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How is choice A chiral in this problem? I thought double-bonded atoms couldn't be chiral.

Thanks!

 

[TeamGuo]

this is an allene, which does not need 4 different groups attached to a C to be chiral. Since the terminal C has different groups attached to it, and you can rotate the allene molecule side ways it is optically active.

Try wiki, it has decent explanation on allene chirality.