R- Examples CH3 3-methylpentanal CHO 2-cyclopentenecarbaldehyde cyclopent-2-en-1-carbaldehyde => Chapter 18 7Chapter 18 7 Examples CH3 CH2 CH CH3 CH2 C H O CHO 3-methylpentanal 2-cyclopentenecarbaldehyde cyclopent-2-en-1-carbaldehyde =>