Question: how many 1 3 diaxial interactions in methylcyclohexane?
Answer: Diaxial interaction (1,3-diaxial interaction): An interaction (usually repulsive) between two axial substituents on a cyclohexane ring. On the top face of this chair cyclohexane, the axial methyl groups and axial hydrogen atom experience diaxial repulsion (indicated with the red dashed line).