Which of the following statements is incorrect. The members of the homologous series of alkanes :

Foundation

Chemistry Foundation

Important Compounds of Carbon

Question

show a regular gradation of physical properties.

are all straight chain compounds.

have similar chemical properties.

have the general formula C_nH_2n+2

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Homologous series are groups of organic compounds with the same functional group and general formula, differing by CH₂ units. Alkanes are saturated hydrocarbons with the general formula $C_{n} H_{2 n + 2}$ . They show a gradation in physical properties and similar chemical properties. However, alkanes can be straight-chain OR branched-chain compounds (e.g., isobutane). Therefore, the statement that they are all straight chain compounds is incorrect.

Final Answer: are all straight chain compounds.