Which organic compound among the following is not an isomer of CH3−CO−CH2CH2CH2CH3?
Options:
A .  
CH3CH2OCH=CHCH2CH3
B .  
CH3CH=CHCH2CH2CHO
C .  
(CH3)2CHCOCH2CH3
D .  
CH3CH2COCH2CH2CH3
Answer: Option B : B Compounds A, C and D have same molecular formula as that of CH3−CO−CH2CH2CH2CH3 with a formula of C6H12O But compound B has C6H10O and hence it is not an isomer.
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