MDCAT Chemistry MCQ #284

A student adds hydrogen cyanide to 0.25 moles of ethanal to form a cyanohydrin. How many moles of HCN are consumed in this reaction?

MDCAT Chemistry MCQ #284

  1. Question 1

    Q1. A student adds hydrogen cyanide to 0.25 moles of ethanal to form a cyanohydrin. How many moles of HCN are consumed in this reaction?

    • A) 0.25 moles
    • B) 0.50 moles
    • C) 0.75 moles
    • D) 1.00 moles

    Answer: 0.25 moles

    Explanation: Nucleophilic addition of HCN to ethanal occurs in a 1:1 molar ratio. 0.5 moles is a distraction based on incorrect stoichiometry.