[Olympiad] Which of the following compounds will rotate the plane of polarized light?

2-methylpropane
1-chlorobutane
2-chlorobutane
2-methylbut-2-ene

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A compound rotates polarized light if it is chiral. 2-chlorobutane has a chiral center (C2 is bonded to -H, -Cl, -CH₃, and -CH₂CH₃), making it optically active.

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