Question

Which one is the correct order of acidity ? [2017]
(a) CH ≡ CH > CH₃ – C ≡ CH > CH₂ = CH₂ > CH₃ – CH₃
(b) CH ≡ CH > CH₂ = CH₂ > CH₃ – C ≡ CH > CH₃ – CH₃
(c) CH₃ – CH₃ > CH₂ = CH₂ > CH₃ – C ≡ CH> CH ≡ CH
(d) CH₂ = CH₂ > CH₃ – CH = CH₂ > CH₃ – C ≡ CH > CH ≡ CH

Answer 1

Answer:

The correct option is (a)

Thank you!

Hope it helps you.

Answer 2

Let us solve for it

Explanation:

The acidic character can be decided by hybridization

1. Alkynes are acidic because of sp hybridisation of Carbon atom.
2. The S character in case of alkynes is 50%.
3. Due to large S character, electrons in sp hybrid orbital’s are held more tightly by   nucleus and are quite electronegative.
4. As a result the H – C bond get more displaced towards carbon atom and proton is easily released.

R – C ≡  C – H R – C ≡ / H – bond breaks and H is easily released  

On the basis of it we  now answer the above asked the order is :a) ) CH ≡ CH > CH₃ – C ≡ CH > CH₂ = CH₂ > CH₃ – CH₃