{"id":196066,"date":"2025-03-02T09:02:18","date_gmt":"2025-03-02T09:02:18","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=196066"},"modified":"2025-03-02T09:02:20","modified_gmt":"2025-03-02T09:02:20","slug":"draw-the-newman-projections-for-the-anti-and-gauche-forms-of-12-dibromoethane","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/03\/02\/draw-the-newman-projections-for-the-anti-and-gauche-forms-of-12-dibromoethane\/","title":{"rendered":"Draw the Newman projections for the anti and gauche forms of 1,2-dibromoethane"},"content":{"rendered":"\n

Draw the Newman projections for the anti and gauche forms of 1,2-dibromoethane. The molecule has a dipole moment of 1.0 D.<\/p>\n\n\n\n

a) Which form is responsible for the molecular dipole (gauche\/anti)?<\/p>\n\n\n\n

(b) Which conformation of 1,2-dibromoethane is present in the greatest amount at equilibrium (eclipsed\/gauche\/…<\/p>\n\n\n\n

The Correct Answer and Explanation is :<\/strong><\/mark><\/p>\n\n\n\n

a) Which form is responsible for the molecular dipole (gauche\/anti)?<\/strong><\/p>\n\n\n\n

The gauche<\/strong> conformation of 1,2-dibromoethane is responsible for the molecular dipole. In this conformation, the bromine atoms are positioned at a 60\u00b0 dihedral angle relative to each other, resulting in a net dipole moment because the individual bond dipoles do not cancel out. In contrast, the anti<\/strong> conformation, where the bromine atoms are 180\u00b0 apart, has a net dipole moment of zero due to the cancellation of opposing dipoles. \ue200cite\ue202turn0search11\ue201\ue206<\/p>\n\n\n\n

b) Which conformation of 1,2-dibromoethane is present in the greatest amount at equilibrium (eclipsed\/gauche\/anti)? Provide the correct answer and a 300-word explanation.<\/strong><\/p>\n\n\n\n

At equilibrium, the anti<\/strong> conformation of 1,2-dibromoethane predominates. This preference arises from a combination of steric and electronic factors:\ue206<\/p>\n\n\n\n