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(A) Butane has the molecular formula $C_4H_{10}$.Structural isomers are compounds with the same molecular formula but different structural arrangement

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$(i)$ and $(ii)$

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(A) Butane has the molecular formula $C_4H_{10}$.Structural isomers are compounds with the same molecular formula but different structural arrangements.$(i)$ $n$-butane is a straight-chain isomer of butane $(C_4H_{10})$.(ii) Isobutane ($2$-methylpropane) is a branched-chain isomer of butane $(C_4H_{10})$.(iii) Cyclobutane has the formula $C_4H_8$,so it is not an isomer of butane.(iv) The structure shown is not a valid isomer of butane.Therefore,$(i)$ and $(ii)$ are the correct structural isomers of butane.

Which of the following are correct structural isomers of butane $(C_4H_{10})$?
$(i)$ $n$-butane: $CH_3-CH_2-CH_2-CH_3$
(ii) Isobutane ($2$-methylpropane): $CH_3-CH(CH_3)-CH_3$
(iii) Cyclobutane: $A$ four-carbon ring structure $(C_4H_8)$
(iv) Ethane dimer: Not a valid isomer of butane.

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Which of the following are correct structural isomers of butane $(C_4H_{10})$?$(i)$ $n$-butane: $CH_3-CH_2-CH_2-CH_3$(ii) Isobutane ($2$-methylpropane): $CH_3-CH(CH_3)-CH_3$(iii) Cyclobutane: $A$ four-carbon ring structure $(C_4H_8)$(iv) Ethane dimer: Not a valid isomer of butane.