# The number of structural isomers possible for ${C_4}{H_8}$ is.1) $4$2) $3$3) $5$ 4) $6$

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Hint: We know that the molecules with the same molecular formula but different molecular geometries are called isomers. There are a number of types of isomers. They are,
Conformational isomers.
Constitutional isomers.

We must know that an alkane with 4 carbon atoms would have the formula $\;{C_4}{H_{10}}$ but the given hydrocarbon has two hydrogens less, so it must contain either a double bond or a ring. There are five possible isomers. They are But-1-ene, But-2-ene, 2-Methylpropane, Cyclobutane, and methyl cyclopropane.We can draw the all possible isomeric structures as,

Therefore, the option 3 is correct.