A) tautomerism
B) chain isomerism
C) position isomerism
D) geometrical isomerism
Correct Answer: C
Solution :
Tautomerism: It is characteristic of compounds having labile hydrogen atom. The two isomers cannot be separated. e.g., nitro compounds. Chain isomerism: The two isomers differ in carbon skeleton. Position isomerism: The position of functional group or substituent group or double or triple bond is different, e. g., n-propyl alcohol and isopropyl alcohol. \[\underset{n-propyi\text{ }alcohol}{\mathop{C{{H}_{3}}C{{H}_{2}}\overset{\begin{smallmatrix} OH \\ | \end{smallmatrix}}{\mathop{C{{H}_{2}}}}\,}}\,\] \[\underset{Isopropyi\text{ }alcohol}{\mathop{C{{H}_{3}}\overset{\begin{smallmatrix} OH \\ | \end{smallmatrix}}{\mathop{CHC{{H}_{3}}}}\,}}\,\] Geometrical isomerism: It is exhibited by compounds having double bond and the two groups attached to two carbon atoms are different.
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