Question

In which of the following are all carbon atoms only triple bonded?

• A. $C_3{H}_6$
• B. $C_2{H}_4$
• C. $C_2{H}_2$
• D. $C_2{H}_6$

Answer 1

The correct option is C $C_2{H}_2$

$C_3{H}_6:\begin{array}{ccccccccc}& & H& & & & & & \\ & & |& & & & & & \\ H& -& C& -& C& =& C& -& H\\ & & |& & |& & |& & \\ & & H& & H& & H& & \end{array}$
$C_2{H}_4:\begin{array}{ccccccc}H& -& C& =& C& -& H\\ & & |& & |& & \\ & & H& & H& & \end{array}$
$C_2{H}_2:H-C\equiv C-H$
$C_2{H}_6:\begin{array}{ccccccc}& & H& & H& & \\ & & |& & |& & \\ H& -& C& -& C& -& H\\ & & |& & |& & \\ & & H& & H& & \end{array}$

In the compound $C_2{H}_2$, the carbon atoms are only triply bonded.