$(i)$ Glucose $+ ROH \quad \stackrel{\text { dry } HCl }{\longrightarrow}$ Acetal

$\xrightarrow[{{{\left( {C{H_3}CO} \right)}_2}O}]{{x\,eq.of}}$ acetyl derivative

$(ii)$ Glucose $\xrightarrow{{Ni/{H_2}}}A\xrightarrow[{{{\left( {C{H_3}CO} \right)}_2}O}]{{y\,\,eq.\,of}}$ acetyl derivative.

$(iii)$ Glucose $\xrightarrow[{{{\left( {C{H_3}CO} \right)}_2}O}]{{z\,ed.\,of}}$ acetyl derivative.

$' x ^{\prime},{ }^{\prime} y ^{\prime}$ and ${ }^{\prime} z^{\prime}$ in these reactions are respectively.

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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 ($2$) 

$(a)$ Heated : it is charred

$(b)$ $I_2$ solution : no violet colour

$(c)$ Fehling solution : reddish brown ppt. is observed

$(d)$ It does not reduce copper$(II)$ acetate to $Cu_2O$ . No red precipiated is observed in $5/ min$ 

The carboxylate which satisfy all the above observation