(D) The molecular formula of ethane is $C_{2}H_{6}$.In ethane,there are two carbon atoms linked by a single covalent bond $(C-C)$.Each carbon atom is

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(D) The molecular formula of ethane is $C_{2}H_{6}$.In ethane,there are two carbon atoms linked by a single covalent bond $(C-C)$.Each carbon atom is further bonded to three hydrogen atoms by single covalent bonds $(C-H)$.Total bonds = $1$ ($C-C$ bond) + $6$ ($C-H$ bonds) = $7$ covalent bonds.Therefore,ethane has $7$ covalent bonds.