<prompt> Number of -OH groups in ribose:4562  <response>: option a : Number of -OH groups in ribose is 4 General rule : Number of -OH groups are always one less than the number of carbons in carbohydrates Glucose 6C has 5 -OH groups. Ribose 5C has 4 -OH groups. MONOSACCHARIDES No of C atoms Generic name Example Ald No. of OH groups 3 Trioses Glyceraldehyde 2 4 Tetroses Erythrose 3 5 Pentoses RiboseXylose Epimer of Ribose Arabinose 4 6 Hexoses GlucoseGalactose Mannose 5 