Question

Which order reaction obeys the expression $t_{1/2}\propto 1/[A]?$

• A. First
• B. Second
• C. Third
• D. Zero

Answer 1

Answer: (B)

$t_{1/2}\propto a^{1-n}$
if $n=0$
if $n=1$
if $n=2$
i.e., second order.
$t_{1/2}\propto a^{\prime }$
$t_{1/2}\propto a^0$
$t_{1/2}\propto a^{1-2}\to t_{1/2}\propto a^{-1}\to t_{1/2}\propto \frac{1}{a}$