A student has studied the decomposition of a gas $AB _3$ at $25^{\circ} C$. He obtained the following data.

$p ( mm Hg )$ $50$ $100$ $200$ $400$
Relative $t _{1 / 2}( s )$ $4$ $2$ $1$ $0.5$

The order of the reaction is

  • [JEE MAIN 2023]
  • A

    $0.5$

  • B

    $2$

  • C

    $1$

  • D

    $0$

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