For a reaction $X + Y \to Z$, rate $ \propto \, [X]$. What is $(i)$ molecularity and $(ii)$ order of reaction ?

  • A

    $(i)$ can't be defined, $(ii)\,\, 1$

  • B

    $(i)\,\, 2, (ii)\,\, 2$

  • C

    $(i)\,\, 1, (ii)\,\, 1$

  • D

    $(i)\,\, 1, (ii)\,\, 2$

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  • [AIEEE 2004]