Question

Which of the following molecules contains \[\begin{array}{cc}\\
\backslash\phantom{..........}/\\
\ce{C = C}\\
/\phantom{..........}\backslash\\
\end{array}\]  bond between adjacent carbon atoms?

P C₄H₈

Q C₃H₄

R C₃H₆

Options

• Only P

• Only R

• Both P and R

• Both P and Q

Answer 1

Both P and R

Explanation: 

C₄H₈ and C₃H₆ have the general formula C_nH_2n, which corresponds to alkenes (containing a C = C double bond) 

E.g., Butene and propene.

C₃H₄ has the general formula C_nH_2n−2, which commonly represents alkynes containing a C ≡ C triple bond, such as propyne.