MCQ
Which of the following monosaccharides is a pentose?
  • A
    Fructose
  • B
    Galactose
  • C
    Ribose
  • D
    Glucose

Answer

C. Ribose
Explanation:
Ribose

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$\begin{array}{*{20}{c}}
  {C{H_3} - CH - CH = C{H_3}} \\ 
  {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {C{H_3}\,\,\,\,\,\,\,\,\,\,\,\,} 
\end{array}\xrightarrow{{HBr}}A$

$\begin{array}{*{20}{c}}
  {C{H_3} - CH - CH = C{H_3}} \\ 
  {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {C{H_3}\,\,\,\,\,\,\,\,\,\,\,\,} 
\end{array}\xrightarrow{{HBr + ROOR}}B$

$\begin{array}{*{20}{c}}
  {C{H_3} - CH - CH = C{H_3}} \\ 
  {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {C{H_3}\,\,\,\,\,\,\,\,\,\,\,\,} 
\end{array}\xrightarrow{{NBS}}C$

Compare rate of reaction with $AgNO_3$