Question

the triple bond of an alkyne can be selectively reduced into double bond by ______​

Answer 1

Answer:

The triple bond of alkyne can be selectively reduced into double bond by hydrogenation.

Explanation:

CH≡CH + H ₂→ CH₂≈CH₂

Answer 2

Answer:

addition of hydrogen

Explanation:

As with alkenes, the addition of water to alkynes requires a strong acid, usually sulfuric acid, and is facilitated by mercuric sulfate. However, unlike the additions to double bonds which give alcohol products, addition of water to alkynes gives ketone products ( except for acetylene which yields acetaldehyde ). The explanation for this deviation lies in enol-keto tautomerization, illustrated by the following equation. The initial product from the addition of water to an alkyne is an enol (a compound having a hydroxyl substituent attached to a double-bond), and this immediately rearranges to the more stable keto tautomer.