NEET 2016 Phase 2 · ChemistryPrevious Year Question
In which of the following molecules are all atoms coplanar?
Answer: (A) (A). \textbf{Answer:} (a) \textbf{Solution:} Coplanarity of all atoms requires every carbon to be (trigonal planar) and the framework flat.
- A.(A)✓
- B.(B)
- C.(C)
- D.(D)
Correct Answer
(A) (A)
Solution & Explanation
\textbf{Answer:} (a) \textbf{Solution:} Coplanarity of all atoms requires every carbon to be (trigonal planar) and the framework flat. Biphenyl is built entirely from two benzene rings, so all carbon and hydrogen atoms lie in essentially one plane. The cyclohexane-containing options contain (tetrahedral, chair) carbons, which cannot be coplanar; the alkene-dinitrile option has carbons that break planarity. Hence biphenyl is the fully planar system. Hence (a).
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