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.	(A) and (R) both are correct statements and (R) explain the (A).
2.	Both (A) and (R) are wrong statements.
3.	(A) is the correct statement and (R) is the wrong statement.
4.	(A) is the wrong statement and (R) is the correct statement.

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