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Solution


Q.

The two functional groups characteristic of sugars are           [2018]
1 hydroxyl and methyl  
2 carbonyl and methyl  
3 carbonyl and phosphate  
4 carbonyl and hydroxyl.  

Ans.

(4)

Carbohydrates (commonly called sugars) are chemically defined as polyhydroxy aldehyde or ketones. All sugar molecules have one carbonyl group (-CO-) in addition to hydroxyl group (OH) on other carbon atoms.