Despite having an aldehydic group:
(a) Glucose does not give 2, 4-DNP test. What does this indicate?
(b) Draw the howorth structure of -D-(+)-Glucopyranose.
(c) What is the significance of D and (+) here?

Asked by Topperlearning User | 22nd Jun, 2016, 08:00: AM

Expert Answer:

(a) This indicates that the aldehydic group in glucose is not free.
(b)

(c) 'D' gives the configuration, i.e. the group at carbon 5 is on the right hand side and (+) indicates that the isomer is Dextrorotatory.

Answered by  | 22nd Jun, 2016, 10:00: AM