Chemistry - STEREO ISOMERISM Question with Solution | TestHub

Read the two carbons along the line of sight : the front carbon carries $\mathrm{C}{\mathrm{H}}_3$, H, H and the back carbon carries ${\mathrm{C}}_2{\mathrm{H}}_5$, H, H, so the skeleton is $\mathrm{C}{\mathrm{H}}_3-\mathrm{C}{\mathrm{H}}_2-\mathrm{C}{\mathrm{H}}_2-\mathrm{C}{\mathrm{H}}_2-\mathrm{C}{\mathrm{H}}_3$ = n-pentane. 2-Methylbutane would show $\mathrm{C}{\mathrm{H}}_3$, $\mathrm{C}{\mathrm{H}}_3$, H on the front carbon; 2-methylpentane would need six carbons; n-hexane would need a propyl group on the back carbon.