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The rate constant of a reaction is 0.1386 min^-1 . The time for 75% completion of reaction is (in min)

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2.17

4.34

answer is B.

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Detailed Solution

Rate constant (K) =0.1386

$\begin{array}{l} k = \frac{0 .693}{t_{0 .5}}; t_{0.5} = \frac{0.693}{0.1386} \Rightarrow t_{0 .5} = 5 \\ t_{0 .75} = 2 \times t_{0 .5} = 10 \min \end{array}$

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