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Comprehension XIV
A substance ' \( \mathrm{X} \) ' dissociates simultaneously into ' \( \mathrm{Y} \) ' and ' \( \mathrm{Z} \) ' as
\[
\begin{array}{c}
\mathbf{X}(\mathrm{g}) \stackrel{A_{1}=2 \times 10^{14} \mathrm{~s}^{-1}, E \mathrm{a}_{1}=12 \mathrm{kcal} / \mathrm{mol}}{\longrightarrow} \mathbf{Y}(\mathrm{g}) \\
\mathbf{X}(\mathrm{g}) \stackrel{A_{1}=2 \times 10^{14} \times e^{-2} \mathrm{~s}^{-1}, E \mathrm{a}_{1}=9 \mathrm{kcal} / \mathrm{mol}}{\longrightarrow} \mathbf{Z}(\mathrm{g})
\end{array}
\]
Which of the following statement is correct regarding the major product of the reactions?
(a) 'Y' will be the major product at \( 300 \mathrm{~K} \).
(b) 'Y' will be the major product at \( 700 \mathrm{~K} \).
(c) 'Y' will be the major product at \( 900 \mathrm{~K} \).
(d) ' \( \mathrm{Z} \) ' will be the major product at \( 900 \mathrm{~K} \).
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