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Q87 (CDS-I/2019) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Organic chemistry basics Answer Verified

Which one of the following statements is not correct?

Result
Your answer: —  Â·  Correct: C
Explanation

Fischer projections represent molecules in an eclipsed conformation [2]. In this projection, horizontal bonds point toward the viewer and vertical bonds point away, which corresponds to an eclipsed arrangement of groups on adjacent carbons [1]. Because eclipsed conformations involve significant torsional strain and steric hindrance, they are generally the least stable conformations of a molecule [1]. Therefore, the statement that the Fischer projection represents the most stable conformation is incorrect. Conversely, Newman projections can represent eclipsed, staggered, and skew (gauche) conformations [1]. Sawhorse projections depict the molecule from an oblique angle where bonds are typically shown at 120° angles to each other to represent the tetrahedral geometry in a two-dimensional plane [1]. Staggered conformations, often shown in Newman or Sawhorse projections, are typically the most stable due to minimized repulsion [1].

Sources

  1. [1] https://www.kngac.ac.in/elearning-portal/ec/admin/contents/2_18KP2CHO5_2021012801300773.pdf
  2. [2] https://rammohancollege.ac.in/images/Study%20Materials/Stereo%20Note-PPT5.pdf
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