Question

Which amongst the following contains a triple bond?

• A. ${\mathrm{C}}_2{\mathrm{H}}_3$
• B. ${\mathrm{C}}_2{\mathrm{H}}_2$
• C. ${\mathrm{C}}_2{\mathrm{H}}_4$
• D. ${\mathrm{C}}_3{\mathrm{H}}_4$

Answer 1

Answer: (B), (D)

${\mathrm{C}}_3{\mathrm{H}}_4$

Explanation for correct option

(B), and (D)

General formula of alkynes

• The general formula of alkynes is ${\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}–2}$.
• Here, n is the number of carbon atoms in the molecule.
• ${\mathrm{C}}_2{\mathrm{H}}_2$, ${\mathrm{C}}_3{\mathrm{H}}_4$ is satisfying the general formula for alkyne. So, both contain one triple bond.

So, ${\mathrm{C}}_2{\mathrm{H}}_2$, and ${\mathrm{C}}_3{\mathrm{H}}_4$ contains a triple bond.

Explanation for incorrect option

• ${\mathrm{C}}_2{\mathrm{H}}_3$ is not satisfying the formula of alkyne. So, it does not contain a triple bond.
• The general formula of alkenes is ${\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}}$.${\mathrm{C}}_2{\mathrm{H}}_4$ is alkene. So, ${\mathrm{C}}_2{\mathrm{H}}_4$ contains a double bond.
• Hence, options (A), and (C) are incorrect.

${\mathrm{C}}_2{\mathrm{H}}_2$, and ${\mathrm{C}}_3{\mathrm{H}}_4$ contains a triple bond. Hence, options (B), and (D) are correct.