Which of the following pairs of compounds are not functional isomers?

Options

A. Methyl cyanide and methyl isocyanide
B. nitromethane and methyl nitrite
C. Ethylidene dichloride and ethylene dichloride
D. glucose and fructose

Answer

C

Explanation

They are position isomers `CH_(3)CHCl_(2)` and `underset(Cl)underset(|)(C)H_(2)overset(Cl)overset(|)(C)H_(2)`
(1) `CH_3CN` and `CH_3NC`
(2) `CH_3NO_2` and `CH_3ONO`
(3) Glucose is aldohexose while fructose is ketohexose