The correct order for acid strength of compounds CH ≡ CH ,   CH 3 - C ≡ CH and CH 2 = CH 2…

The correct order for acid strength of compounds CH≡CH, CH3-C≡CH and CH2=CH2 is as follows:
  1. CH3-C≡CH>CH≡CH>CH2=CH2
  2. HC≡CH>CH3-C≡CH>CH2=CH2
  3. CH≡CH>CH2=CH2>CH3-C≡CH
  4. CH2-C≡CH>CH2=CH2>HC≡CH

Solution

Because acidic character ∝ stability of conjugate base (Anion)

(a) CH=C−anion(−ve  on Csp)

(b) CH3−C≡C−(−ve  on Csp and +I of −CH3)

(c) CH2=C−H(−ve on Csp2)

Acidic character order CH≡C−Csp>CH3−C≡C−Cspwith+I  of CH3>CH2=C−Csp2
 

Asked in: JEE Main 2019 (12 Jan Shift 1)

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