The molecular formula of a common organic laboratory anaesthetic is

The question is asking for the molecular formula of a common organic laboratory anaesthetic. To answer this question, we need to look at the options provided. Among the options, we see four different molecular formulas, each with a different combination of atoms. We need to identify which of these is the correct molecular formula for a common organic laboratory anaesthetic. Out of the four options, the molecular formula that corresponds to a common organic laboratory anaesthetic is CHCl₃ (option A). This is the formula for chloroform, which is a commonly used anaesthetic in laboratories. Therefore, the correct answer to this question is option A: CHCl₃.