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BITSAT 2016
Exam
BITSAT
Year
2016
Subject
Chemistry
Chapter
Aldehydes and Ketones

BITSAT 2016 · Chemistry · Aldehydes and Ketones

What will happen when D-(+)-glucose is treated with methanolic -...

What will happen when D-(+)-glucose is treated with methanolic - HCl followed by Tollens' reagent?

Options

  1. AA black ppt. will be formed
  2. BA red ppt. will be formed
  3. CA green colour will appear
  4. DNo characteristic colour or ppt. will be formed.

Correct answer

D. No characteristic colour or ppt. will be formed.

Step-by-step solution

Reaction of D−(+)\mathrm{D}-(+) -glucose with methanolic −HCl-\mathrm{HCl} leads to formation of methyl glucoside \left(\mathrm{C}_{1}-\mathrm{OH}\right. group is methylated) which, being acetal, is not hydrolysable by base, so it will not respond Tollens'reagent.
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