Question

Which of the following molecules is associated with triple covalent bond?

• A. Ethane
• B. Ethylene
• C. Acetylene
• D. Carbon dioxide

Answer 1

The correct option is C

Acetylene

Explanation of correct option:

(C) Acetylene

• Among the following given only acetylene has a triple covalent bond.
• The structure of acetylene is $\mathrm{H}-\mathrm{C}\equiv \mathrm{C}-\mathrm{H}$.
• From the structure, it is clear that there are three covalent bonds present in acetylene.

Explanation of incorrect options:

(A) Ethane

• Ethane has only single bonds. The structure is ${\mathrm{H}}_3\mathrm{C}-{\mathrm{CH}}_3$.

(B) Ethylene

• Ethylene has $\mathrm{C}=\mathrm{C}$, the structure is ${\mathrm{H}}_2\mathrm{C}={\mathrm{CH}}_2$.

(D) Carbon dioxide

• Carbon dioxide has a double-bonded structure given as follows $\mathrm{O}=\mathrm{C}=\mathrm{O}$.

Hence, the correct option is (C).