Question

Consider the following reactions :
(i) Glucose $+ROH\stackrel{\text{dry}HCl}{\to }$ Acetal
$\underset{(C{H}_{3}CO{)}_{2}O}{\overset{xeq.of}{\to }}$ acetyl derivative
(ii) Glucose $\stackrel{Ni/H_2}{\to }A\underset{(C{H}_{3}CO{)}_{2}O}{\overset{yeq.of}{\to }}$ acetyl derivative
(iii) Glucose $\underset{(C{H}_{3}CO{)}_{2}O}{\overset{zeq.of}{\to }}$ acetyl derivative
'x', 'y' and 'z' in these reactions are respectively.

• A. $5,6$ & $5$
• B. $4,5$ & $5$
• C. $5,4$ & $5$
• D. $4,6$ & $5$

Answer 1

Answer: (D)

(i) Glucose + dry $HCl\stackrel{ROH}{\to }$ Acetal $\underset{(C{H}_{3}CO{)}_{2}O}{\overset{xEq}{\to }}$ acetyl derivative

(ii) Glucose $\stackrel{Ni/H_2}{\to }A\underset{(C{H}_{3}CO{)}_{2}O}{\overset{yEq}{\to }}$ Acetyl derivative

(iii) Glucose $\underset{(C{H}_{3}CO{)}_{2}O}{\overset{zEq}{\to }}$ Acetyl derivative

due to presence of $-OH$ group in Glucose the reaction is



so for (i)