Question

Which organic compound among the following is not an isomer of $C{H}_3-CO-C{H}_{2}C{H}_{2}C{H}_{2}C{H}_3$?

• A. $C{H}_{3}C{H}_{2}OCH=CHC{H}_{2}C{H}_3$
• B. $C{H}_{3}CH=CHC{H}_{2}C{H}_{2}CHO$
• C. $(C{H}_3{)}_{2}CHCOC{H}_{2}C{H}_3$
• D. $C{H}_{3}C{H}_{2}COC{H}_{2}C{H}_{2}C{H}_3$

Answer 1

The correct option is B $C{H}_{3}CH=CHC{H}_{2}C{H}_{2}CHO$

Compounds A, C and D have same molecular formula as that of $C{H}_3-CO-C{H}_{2}C{H}_{2}C{H}_{2}C{H}_3$ with a formula of $C_6{H}_{12}O$

But compound B has $C_6{H}_{10}O$ and hence it is not an isomer.