4. Suggest a plausible arrow-pushing mechanism for the following reaction. -NH N I Me _NH ОН ОН conc. HCI H2O 110 °C, Зh N TH Me ОН ОН 4 76%

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Actinides

The elements in which the extra electron tends to enter the 5f-orbitals of (n–2)th main shell are considered 5f-block elements. They are also named actinides. Actinides include 15 elements, from atomic number 89 to 103.