Which of the following is NOT a characterstic of chemisorption?

Identify a side chain (R) group present in Leucine, an amino acid.

What is half life of a first order reaction if time required to decrease concentration of reactant from 0.4 M to 0.1 M is $x$ hour?

$$ \text { Identify ' } \mathrm{A} \text { ' in the following reaction. } $$

$$ \mathrm{A}+\text { Acetyl chloride } \xrightarrow[\mathrm{AlCl}_3]{\text { anhydrous }} \text { 2-Chloroacetophenone + 4-Chloroacetophenone }$$