Question

Identify the alkynes $A,B,\left(C_{10}{H}_{18}\right)$ and $\left(C_{10}{H}_{16}\right)$ which gives the following reactions. What is (B)?

• A. $Dec-6-yne$
• B. $Hex-1-yne$
• C. $Dec-5-yne$
• D. $Non-5-yne$

Answer 1

The correct option is C $Dec-5-yne$

Since alkyne (B) has no reaction with Grignard reagent, it should be internal and symmetrical alkyne, as evident from the oxidative cleavage reaction with hot alkaline $KMn{O}_4$.
Structure of B is: $Dec-5-yne$