Which of the following compounds contain secondary (2°) radical carbons?

Question

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A secondary (2°) radical carbon is a carbon that is attached to 2 other carbon atoms. In compound I, the radical carbon is tertiary (3°); it is connected to three other carbons. In compound II, there are two secondary radical carbons. In compound III, there are no radical carbons. In compound IV, the radical carbon is secondary because it is attached to two other carbons.

Which of the Following Compounds Contain Secondary (2°) Radical Carbons