Question

R.Q of $C_{18}{H}_{32}{O}_{16}$ is

• A. 0.715
• B. 1
• C. 1.43
• D. 2.145

Answer 1

The correct option is B 1

The respiratory quotient (R.Q) is the ratio of $C{O}_2$ produced to $O_2$ consumed, while food is being metabolized.

RQ = $C{O}_2$ eliminated / $O_2$ consumed.

The respiratory quotient for carbohydrate metabolism can be demonstrated by the chemical equation for oxidation of glucose.

$C_6{H}_{12}{O}_6$ + 6 $O_2$-----> 6 $C{O}_2$+ 6 $H_{2}O$

Because the gas exchange in this reaction is equal, the respiratory quotient for carbohydrates is: RQ = 6 $C{O}_2$ / 6 $O_2$ = 1.

$C_{18}{H}_{32}{O}_{16}$ is a polysaccharide raffinose, therefore R.Q is 1. Thus, the correct answer is option B.