Carbon forms four covalent bonds by sharing its four valence electrons with four univalent atoms,e.g. hydrogen. After the formation of four bonds,carbon attains the electronic configuration of

  • A
    neon
  • B
    helium
  • C
    argon
  • D
    krypton

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(iii) Cyclobutane: $A$ four-carbon ring structure $(C_4H_8)$
(iv) Ethane dimer: Not a valid isomer of butane.

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