The rate law for hydrolysis of this acetamide, ${CH}_{3} {CSNH}_{2}$ is:

Rate= K [thioacetamide] $[H^{+}]$
In which of the following solutions, will the rate of hydrolysis of thioacetamide(TA) is least at 25° C?

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$0.15 MTA + 0.15 MHCl$

$0.1 MTA + 0.20 M {HNO}_{3}$

$0.1 MTA + 0.20 M {CH}_{3} COOH$

$0.1 MTA + 0.20 MHCOOH$

answer is B.

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Detailed Solution

The rate for the reaction,

$Ratle = k [thio]^{1} {[H^{+}]}^{1}$

$R = k \times 0.1 \times 0.2 R = k \times 0.1 \times 0$

Hence, the rate of hydrolysis of thioacetamide(TA) is least at 25° C is,

$0.1 MTA + 0.20 M {CH}_{3} COOH$

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