Question

If number of aldose, ketose, furanose and pyranose units present in maltose are $p,q,r,s$ respectively. Find the value of $p+q+r+s$

Answer 1

Answer: 4

Monomer of maltose is $\alpha$ -D-glucopyranose. It is disaciharide, so $2$ aldose and $2$ pyranose forms are present in maltose.
Hence, $p=2,q=0,r=0$ and $s=2$
So, sum of $p+q+r+s=2+0+0+2=4$.