Ncert Exercises & Solutions

Assertion (A):	Deoxyribose, $C_{5} H_{10} O_{4}$ , is not a carbohydrate.
Reason (R):	Carbohydrates are hydrates of carbon so compounds that follow $C_{x} {(H_{2} O)}_{y}$ the formula are carbohydrates.

1.	Both (A) and (R) are True and (R) is the correct explanation of (A).
2.	Both (A) and (R) are False.
3.	(A) is True but (R) is False.
4.	(A) is False but (R) is True.

Hint: Deoxyribose is a carbohydrate.

The carbohydrates may be defined as optically active polyhydroxy aldehydes or ketones or the compounds which produce

such units on hydrolysis. Carbohydrates are hydrates of carbon so compounds that follow

C_{x} {(H_{2} O)}_{y}

the formula are carbohydrates is not always true. hence, it is not a correct statement.

Deoxyribose

C_{5} H_{10} O_{4}

is a carbohydrate. The structure is as follows:

= β-D-2-deoxyribose