1. The
glyceraldehyde can be represented as
D ( + ) or D ( - ) . Explain this .
Answer : D represents the spatial configuration of the secondary alcoholic
hydroxyl group and the plus ( + ) and ( - )
signs represent the optical rotation.
2 . Name the hexose present in the blood .
Answer : Glucose
3 . The empirical formula for glucose was proved in
__________
Answer : 1886
4 . Who demonstrated that glucose is a straight chain
polyhydroxylic aldehyde ?
Answer : Kiliani
5. Who proved that certain carbon atoms in glucose
molecules are asymmetric ?
Answer : Emil Fisher
6 . How many
asymmetric carbon atoms are present in the glucose molecule ?
Answer : Four
7 . In which
position four asymmetric carbon atoms are present in glucose molecule ?
Answer : Positions are 2, 3, 4, and 5 .
8 . Compounds having asymmetric carbon atoms are
optically active and exist in more than one form and they are called
_____________
Answer : Isomers
9 . What formula is used to calculate the number of
possible isomers for optically active
compound?
Answer : Vant Hoff formula ( I=2n Where I= number of isomers , n = number
of asymmetric carbon atoms .
10 . The number of
possible isomers for glucose molecule is _____________
Answer : 16 ( I=2
= 24 =16 )
11 . Who proposed the ring structure for monosaccharides?
Answer : Fisher
12 . In glucose the formation of a hemiacetal by the condensation of a simple aldehyde and simple alcohol occurs between
______________ and _____________ at carbon atom 5 of the same molecule .
Answer : Aldehyde group, hydroxyl group.
13 . The α and
β form of the sugars are called ____________
Answer : Anomers
14 . What is the difference between D series and L
series in the position of hydroxyl group
of C – 5 ?
Answer : In D series
the hydroxyl group of C -5 is on the
right . In L series
the hydroxyl group of C -5 is on the
left .
15 . The changing
of optical rotation is
called ______________
Answer : Mutarotation
16 . All sugars forming six membered rings are to be
pyranose . Sugars having five membered ring are to be called furanose ring . Who proposed this ?
Answer : Haworth
16 . The pyranose
sugar is depicted as hexagon. The furanose sugar is depicted as _______
Answer : Pentagon
17 . Fruit sugar is ____________
Answer : Fructose
18 . Which sugar is called levulose?
Answer : Fructose
19 . Which monosaccharide is present abundantly in sweet
fruits?
Answer : Fructose
20 . The sugar present in honey is ____________
Answer : Fructose
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