91Ó°ÊÓ

Which of the following statements is correct? (a) The Ruff procedure lengthens an aldose chain and gives a single product. (b) (c) The Kiliani-Fischer procedure shortens an aldose chain and gives a single product. (d) The Kiliani-Fischer procedure lengthens an aldose chain and gives two epimers.

Which of the following is \(/\) are co-polymer (s)? (a) Nylon-66 (b) Bakelite (c) Teflon (d) Polystyrene

Which of the following is not a disaccharide? (a) sucrose (b) mannose (c) lactose (d) maltose

Which of the following do not undergo hydrolysis? (a) Glucose (b) Fructose (c) Cane sugar (d) Maltose

Which statement about the pyranose form of mannose is not correct? (a) it exists as two anomeric stereoisomers. (b) it reacts with Tollen's reagent to give a silver mirror (i.e., it is a reducing sugars). (c) reaction with excess \(\mathrm{CH}_{3} \mathrm{I}\) and \(\mathrm{AgOH}\) gives a non-reducing penta-O-methyl derivative. (d) it resists reduction with aqueous sodium borohydride.

Two aldopentoses \(\mathrm{X}\) and \(\mathrm{Y}\) give the same osazone derivative. \(\mathrm{X}\) is oxidised to an optically active aldaric acid by dilute nitric acid. Ruff degradation of \(Y\) gave a tetrose which was similarly oxidised to an optically active aldaric acid. Assign the structures of \(X\) and \(Y\) from the following list.

Among the following polymers, peptide linkage is present in (a) Nylon-66 (b) Protein (c) Nylon-6 (d) Tafflon

What is invert sugar, and why is it so named? (a) the sugar mixture from hydrolysis of sucrose; fructose is isomerised to glucose. (b) the sugar mixture from hydrolysis of sucrose; the optical rotation changes from \((+)\) to \((-)\). (c) the sugar mixture from hydrolysis of starch; \(\alpha\) -glycosidic bonds are changed to \beta-glycosidic bonds. (d) the sugar mixture from hydrolysis of starch; glucose is isomerised to fructose.

Among the following polymers, identify the co-polymer (a) Nylon-6 (b) Buna-N (c) Buna-S (d) Protein

Among the following polymers, identify the co-polymer (a) Terylene (b) Glyptal (c) PVC (d) Protein