The number of aldol reactions that occur in the given transformation are

The colour of light absorbed by an aqueous solution of CuSO₄ is

The number of optically active products obtained from the complete ozonolysis of the given compound is ______.

Which of the following hydrogen halides reacts with AgNO₃(aq.) to give a precipitate that dissolves in Na₂S₂O₃ (aq.) ?