$(i)$ Enzymes lack in nucleophilic groups
$(ii)$ Enzymes are highly specific both in binding chiral substrates and in catalyzing their reactions
$(iii)$ Enzymes catalyse chemical reactions by lowering the activation energy
$(iv)$ Pepsin is a proteolytic enzyme
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($1$) The compound $R$ is
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($2$) The compound $T$ is
($A$) glycine
($B$) alanine
($C$) valine
($D$) serine
Given the answer question ($1$) and ($2$) 