Assertion (A) The boiling points of noble gases increases from He to Xe. Reason (R) The interatomic van der Waals' attractive forces increases from $\mathrm{He}$ to $\mathrm{Xe}$. The correct answer is

• Correct answer
  A

  Both (A) and (R) are true, and (R) is the correct explanation of (A)
• B

  Both $(\mathrm{A})$ and $(\mathrm{R})$ are true, and $(\mathrm{R})$ is not the correct explanation of (A)
• C

  (A) is true but (R) is not true
• D

  (A) is not true but (R) is true

Hence, the correct answer is option: 'A'.