The empirical formula of a compound is $C_2H_5O$ and its vapour density is $45$. What is the molecular formula of the compound?

  • A
    $C_2H_5O$
  • B
    $C_6H_{13}O_3$
  • C
    $C_4H_{10}O_2$
  • D
    $C_6H_{15}O_3$

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