Question

In the given Aldose which can form the same osazone
(I) D - glucose
(II) D - gulose
(III) D - mannose
(IV) D - galactose

• A. I, III
• B. I, III, IV
• C. I, II
• D. III, IV

Answer 1

The correct option is A I, III

• D-glucose and D-mannose form the same osazone when treated with an excess of phenylhydrazine because they differ only in the configuration of 1st and 2nd carbon atoms which are transformed to the same form.