MCQ
Which of the following statements about ribose is incorrect
- AIt is a polyhydroxy compound
- BIt is an aldehyde sugar
- ✓It has six carbon atoms
- DIt exhibits optical activity
$Explanation- $Ribose is a monosaccharide having five carbons, thus called pentose sugar. Ribose is the most important pentose present in living organisms. It is an aldose sugar, having an aldehydic functional group. Its molecular formula is represented as $C_5 H_{10} O_5$ . The structural formula of ribose is as follow:
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[Given : $h =6.63 \times 10^{-34}\, J \,s$, and $c =3 \times 10^{8} \,m\, s ^{-1}$ ]
| Process | $\Delta H / kJ\,mol ^{-1}$ | $\Delta S / J K^{-1}$ |
| $A$ | $-25$ | $-80$ |
| $B$ | $-22$ | $40$ |
| $C$ | $25$ | $-50$ |
| $D$ | $22$ | $20$ |
The number of non-spontaneous process from the following is $.....$