Which of the following is not a biopolymer?

$D$-Glucose exists in $x$ different forms. The value of $x$ (stereoisomer) is

Which of the following reagents is used to identify the straight chain of glucose?

Which one of the following sets of monosaccharides forms sucrose?

Sucrose contains which of the following groups?

$A$ disaccharide $X$ cannot be oxidised by bromine water. The acid hydrolysis of $X$ leads to a laevorotatory solution. The disaccharide $X$ is