(A) If two compounds have the same empirical formula but different molecular formula, they have same vapour density.
(R) g/mL is the unit of vapour density.
A. If both assertion and reason are correct and reason is the correct explanation of the assertion
B. If both assertion and reason are correct but reason is not the correct explanation of the assertion
C. If assertion is correct but reason is incorrect
D. If assertion is incorrect but reason is correct