The compound shown has the molecular formula $C X_{5} H X_{10} O$ . How many acyclic structural isomers of this formula contain a single C=O group (aldehydes and ketones), counting the compound shown? Ignore stereoisomers.

Answer: C

The compound is pentan-2-one. Aldehydes: pentanal, 2-methylbutanal, 3-methylbutanal, 2,2-dimethylpropanal (4). Ketones: pentan-2-one, pentan-3-one, 3-methylbutan-2-one (3). Total 7 (checked by computer enumeration from the three C5 skeletons).

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Answer: C

More questions on Isomer counts and degree of unsaturation of drawn compounds

The compound shown has the molecular formula $C X_{5} H X_{10} O$ . How many acyclic structural isomers of this formula contain a single C=O group (aldehydes and ketones), counting the compound shown? Ignore stereoisomers.