For the reaction, 2X+Y→X2Y What will be the expression for instantaneous rate of the reaction?

For the reaction, $2 X + Y \to X_{2} Y$
What will be the expression for instantaneous rate of the reaction?

A
$\frac{- d [X]}{2 dt}$
B
$+ \frac{1}{2} \frac{d [Y]}{dt}$
C
$- \frac{1}{2} \frac{d [X_{2} Y]}{dt}$
D
None of these

Solution:

$- \frac{d [X]}{2 dt} = \frac{- d}{dt} [Y] = + \frac{d [X_{2} Y]}{dt}$

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