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Which one among the following shows maximum ideal behaviour?

  1. $\ce{NH3}$
  2. $\ce{HCl}$
  3. $\ce{Rn}$
  4. $\ce{H2O}$

Ammonia and water have hydrogen bonding so they're ruled out. That leaves radon and $\ce{HCl}$. Radon is a noble gas which means inertness but it's too big in size. That could mean greater van der Waal forces. And $\ce{HCl}$ on the other hand has covalent bonding.

I want to confirm which one of them is more ideal.

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Some molecules are highly polar and thus are subject to electrostatic (dipole-dipole) interactions, which are typically far stronger than the interactions of induced dipoles (commonly referred to as van der Waals forces). See where this gets you.

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