Glucose when reduced with HI and red phosphorus gives

• Correct answer
  A

  $n$-hexane
• B

  $n$-heptane
• C

  $n$-pentane
• D

  n-octane

Solution

Glucose on complete reduction with HI and red P finally gives $n$-hexane. This indicates that it contains a straight chain of six carbon atoms.

Hence, the correct answer is option: 'A'.