In which of the following molecules, all atoms are coplanar?

4 structure options: cyclohexane, (CH3)2C=C(CN)2, bicyclohexyl, biphenyl

1. [structure shown in figure]

2. [structure shown in figure]

3. [structure shown in figure]

4. [structure shown in figure]

Doubtly Asked 30 Oct 2026 NEET UG 2016 Phase 2 Practice test neet Save WhatsApp Report

1 answer

Best answer

Answer: 4. [structure shown in figure]

Key idea: all atoms are coplanar only if every atom is sp2 or sp (no sp3 carbon or its hydrogens).

Cyclohexane and bicyclohexyl have sp3 carbons, so they are non-planar.
\((CH_3)_2C=C(CN)_2\) has methyl groups, whose H atoms cannot all lie in the plane.
Biphenyl has only sp2 carbons and H atoms, so it is taken as the planar one.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

Was this answer helpful?