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Question

Raffinose is a:

A
trisaccharide
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B
monosaccharide
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C
disaccharide
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D
none of the above
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Solution

The correct option is A trisaccharide
When carbohydrates on hydrolysis yield more than two to ten monosaccharides, they are known as oligosaccharides. Therefore trisaccharides are basically oligosaccharides.
Raffinose(C18H32O16) is a trisaccharide as it contains 3 monosaccharide units. On hydrolysis it gives glucose+fructose+galactose. It is mostly found in beans, cabbage, broccoli etc. Refer the above figure for the structure of raffinose.

902801_473563_ans_5f917b0230c04debb3fa1ed8d2c7ca70.PNG

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