Identify correct statements from the following : A. Propanal and propanone are functional isomers. B. Ethoxyethane and methoxypropane are metamers. C. But-2-ene shows optical isomerism. D. But-1-ene and but-2-ene are functional isomers. E. Pentane and 2, 2-dimethyl propane are chain isomers. Choose the correct answer from the options given below :
D. A, B and E only
A. Propanal (CH_3CH_2CHO) and propanone (CH_3COCH_3): Same formula C_3H_6O, different functional groups (aldehyde vs ketone) → Functional isomers. True B. Ethoxyethane (C_2H_5OC_2H_5) and methoxypropane (CH_3OC_3H_7): Same ether group, different alkyl groups → Metamers. True C. But-2-ene (CH_3CH=CHCH_3): No chiral carbon, shows geometrical isomerism (cis-trans), not optical. False D. But-1-ene and but-2-ene: Both are alkenes, differ in position of double bond → Position isomers, not functional isomers. False E. Pentane and 2,2-dimethylpropane: Both C_5H_ 12 , different carbon skeleton → Chain isomers. True Correct: A, B and E only.
Related: Chemistry — General Organic Chemistry · All PYQ Banks