Question

is the following sugar an aldose or ketose? why? what carbon is its anomeric carbon? is this sugar d or l? which structure (a-d) describes its beta- anomer?

Н CH OH CH2OH CH OH -оон CH2OH ОН о ОН ₂ ООН ОН ОН ОН HO-31 ОН ОН ОН ОН ОН Нота-Н -Н НА-ОН Н -ОН 6CHOH ОН ОН ОН ОН A в D

Answer 1

In this diagram all carbohydrate is monosachharide . The explanation of all question given below -

Ans. The diagram of all sugar given - 0 H CH₂OH CH₂OH (OH CHLOH OH - Но Н 0 2 OH Pyet OH OH HO OH Но TH OH HoHS H OH OH OH B-form OH X-form H olt Alpha fors. (13 CHLOH d-form CH₂OH OH OH OH form B- Aasi Note: The following Sugar which given in diagram is aldose sugar which contain aldehyde groupe Aldose. (The Sugar which contain aldehyde Ketose (The sugar which contain ketone group. Sugar groups. Hence due no. group at c.2 aromer. to presence of aldehyde group it is aldose. Ans. b) carbon first in sugar (Diagrom) represent anomeric carbon. Note - The orientations of hydroxyl C-1 position of Aldose change while in ketose. called s gf-oh apbear up called beta anoser while down called x- anomer. Ang @ 9+ gebreseort e. foron i dex too formos) becouse d and I forma decide by of bottom chiral Centre and this -OH of bottom chiral Center at right side hence it is dextro (d-form) form. In the cyclic structure, structure and structure ① represent beta anomer. because in both case -oh group at first carbon at Ub - position. hence ® anel Structure describe its beta-gnomer. -OH Case Ans. )