Question

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3. Since the surface of the silica gel on a silica gel TLC plate is covered in SI-O-H groups, organic molecules that can hydrogen bond will be much more attracted to the silica gel surface. Given that which of the following compounds would have the lowest Rf value if each of these was analyzed using a slica gel TLC plate and dichloromethane as a solvent? OH

Answer 1

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Ute Answer 3 Ref first we will underslond whalis Ry value. it is the ratio of solule. (spot) to the solven spol. distance travelled by solute distance travelled by solvent silico,- TLC (Polar Solvent (non-polar) OM A B с B__shop nore can act as Hence, hydrogen bonding than_c_and A because it acl_ 'as Hydrogen acceptor and Hydrogen donor, where e only. Hydrogen aceptor,_ but a is_non-polar A loill not show H. H- bonding, B will not_move_at_more_hight on the plate it will interact with groups, forna H- bonding, Hence show lowest Rf value, RU < < Ry value ineneasing order → Si-O-n on

4 Rf value for spott, distance travelled by spał = 2,4 cm distance travelled by sovente S. S cm Rj 04363 2.4 sis Ry value for spet 2. 4 clistance travelled by spot distance travelled by soluent sis 4 Rj 5.5 0,72