MCQ
Epoxides are
- ✓Cyclic ethers
- BNot ethers
- CAryl-alkyl ethers
- DEthers with another functional group

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$\mathrm{Eu}, \mathrm{Cm}, \mathrm{Er}, \mathrm{Tb}, \mathrm{Yb}$ and $\mathrm{Lu}$
