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NEET Previous Year Chemistry Questions Chapter Biomolecules

1. Sucrose on hydrolysis gives                                          (NEET 2020)

(a) βD-glucose + αD-fructose

(b) αD-glucose + βD-glucose

(c) αD-glucose + βD-fructose

(d) αD-fructose + βD-fructose

2. The difference between amylose and amylopectin is               (NEET 2018)

(a) amylopectin have 1 4 α-linkage and 1 6 α-linkage

(b) amylose have 1 4 α-linkage and 1 6 β-linkage

(c)amylopectin have 1 4 α-linkage and 1 6 β-linkage

(d)amylose is made up of glucose and galactose.

3.

              (NEET 2016)

(a) L-erythrose, L-threose, L-erythrose, D-threose

(b) D-threose, D-erythrose, L-threose, L-erythrose

(c) L-erythrose, L-threose, D-erythrose, D-threose

(d) D-erythrose, D-threose, L-erythrose, L-threose.

4. Which one given below is a non-reducing sugar?                   (NEET 2016)

(a) Glucose       (b) Sucrose

(c) Maltose       (d) Lactose

5. D (+)-glucose reacts with hydroxyl amine and yields an oxime. The
structure of the oxime would be                                                                     
(NEET 2014)

(a)                     (b)

 

(c)                      (d)

6. Which one of the following sets of monosaccharides forms sucrose? (2012)

(a) αD-galactopyranose and αD-glucopyranose

(b) αD-glucopyranose and βD-fructofuranose

(c) βD-glucopyranose and αD-fructofuranose

(d) αD-glucopyranose and βD-fructopyranose

7. Which one of the following statements is not true regarding (+)–lactose? (2011)

(a) On hydrolysis (+)–lactose gives equal amount of D (+)–glucose and D (+)–galactose.

(b) (+)–Lactose is a b-glucoside formed by the union of a molecule of D (+) –       glucose and a Molecule of D(+)–galactose.

(c) (+)–Lactose is a reducing sugar and does not exhibit mutarotation.

(d) (+)–Lactose, C12H22O11 contains 8 – OH groups.

 

8. Which one of the following does not exhibit the phenomenon of mutarotation? (2010)

(a) (+)–Sucrose                     (b) (+)–Lactose

(c) (+)–Maltose                     (d) (–)–Fructose

9. Fructose reduces Tollens’ reagent due to                                           (2010)

(a) Asymmetric carbons

(b) Primary alcoholic group

(c) Secondary alcoholic group

(d) Enolisation of fructose followed by conversion to aldehyde by base.

10. Number of chiral carbons in β-D-(+) glucose is                               (2004)

(a) Five       (b) six

(c) Three     (d) four.