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The decreasing order of acidic character...

The decreasing order of acidic character among ethane(I), ethene(II), ethyne(III) and propyne (IV) is:

A

(I)gt(II)gt(III)gt(IV)

B

(II)gt(III)gt(I)gt(IV)

C

(III)gt(IV)gt(II)gt(I)

D

(IV)gt(III)gt(II)gt(I)

Text Solution

Verified by Experts

The correct Answer is:
C
The correct order of decreasing acidity is :
`{:(CH -= CH gt CH -= C -CH_3 gt CH_2 = CH_2 gt CH_3 - CH_3),(" "(III)" "(IV)" "(II)" "(I)):}`
Hydrogen atoms attached to sp-hybridised carbon-atom are most acidic, followed by those attached to `sp^2` -hybridised carbon-atom, and those attached to `sp^3` -hybridised carbon are least acidic.
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