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JEE Main levelOne or more correct optionsDifficulty 2 of 3nm194

Which of the following statements about numbers of structural isomers (stereoisomers not counted) is/are correct?

AAlkanes of formula $C X_{5} H X_{12}$ : 3
BHydrocarbons of formula $C X_{4} H X_{8}$ (alkenes and cycloalkanes): 5
COpen-chain alcohols and ethers of formula $C X_{3} H X_{8} O$ : 3
DAlkanes of formula $C X_{6} H X_{14}$ : 6

Answer: A, B, C

C5H12 has 3 (pentane, isopentane, neopentane); C4H8 has 5 (3 alkenes, 2 cycloalkanes); C3H8O has 3 (propan-1-ol, propan-2-ol, methoxyethane); C6H14 has 5, not 6. Correct: A, B, C.

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