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.

  • A
    $(i)$ and $(ii)$
  • B
    $(ii)$ and $(iv)$
  • C
    $(i)$ and $(iii)$
  • D
    $(iii)$ and $(iv)$

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