Question

Which one of the following pairs are called position isomers?

Options

• \[\ce{CH2(OHCH2COOH) and CH3 - CH(OH)COOH}\]

• \[\ce{C2H5OH and CH3OH}\]

• \[\ce{(C4H5)2CO and CH3COOCH2CH2CH3}\]

• All of the above.

Answer 1

\[\ce{CH2(OHCH2COOH) and CH3 - CH(OH)COOH}\]

Explanation:

For isomerism molecular formula must be same

\[\begin{array}{cc}
\ce{CH2 - CH2 - COOH}\phantom{...}\ce{CH3 - CH - COOH}\\
|\phantom{..............................}|\phantom{............}\\
\ce{OH}\phantom{...........................}\ce{OH}\phantom{..........}\end{array}\]

for position isomerism substituents position must be different.