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For the consecutive first-order reactions starting with pure A, the concentration of the intermediate B

  1. Arises to a maximum and then falls
  2. Bfalls continuously from the start
  3. Crises continuously to a final value equal to the initial [A]
  4. Dremains zero until A is exhausted

Answer: A

B is formed from A at a rate that is initially high and consumed to form C at a rate that grows with . So increases from zero, passes through a maximum when its formation and consumption rates are equal, and then decreases to zero.
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