Question

An oligosaccharide (A) on hydrolysis gives 5 molecules of aldohexoses. The number of 'H' atoms in 1 molecule of (A) are equal to 10x+y where x and y are single digit natural numbers. Calculate(x-y).

Answer 1

Oligosaccharide means carbohydrate that yeilds $2$ to $10$ monosacharides units $n$ hydrolysis.

now

$(C_6{H}_{10}{O}_5{)}_n+n{H}_{2}O\underset{}{\overset{H^{+}}{\to }}n{C}_6{H}_{12}{O}_6$

aldohexose

$\because n=5$

$\Rightarrow$ The oligosachharide is $(C_6{H}_{10}{O}_5{)}_5$

$=C_{30}{H}_{50}{O}_{25}$

$\Rightarrow X=5,Y=0$

$\Rightarrow X-Y=5-0=5$

$\Rightarrow X-Y=5$