Which of the following is a monosaccharide?

$A$ diabetic person carries a packet of glucose with him always,because

To detect the reducing and non-reducing sugars,which of the following tests is used?

$A$ sugar '$X$' dehydrates very slowly under acidic conditions to give furfural,which on further reaction with resorcinol gives a coloured product after some time. Sugar '$X$' is

Which of the following statements is incorrect about $\alpha-D$-glucopyranose and $\beta-D$-glucopyranose?

Identify the product obtained when sucrose is treated with conc. $H_2 SO_4$.