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Question
Which of the following alkynes is most acidic?
Which of the following alkynes is most acidic?
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Solution
The correct option is D CH≡CH
Compound (b), But 2-yne has no hydrogen attached to sp hybridised carbon. Thus it lacks acidic hydrogen, so all other compounds are more acidic than it.
In compound (c) and (a) i.e., But-1-yne and Propyne has methyl groups which shows + I effect attached to triple bond. As the number of groups which gives + I effect increases, acidic character decreases. (CH3→ gives +I effect)
Thus, ethyne does not have any +I group and it has two sp hydridised hydrogen atom which make it most acidic of all four compounds.
Compound (b), But 2-yne has no hydrogen attached to sp hybridised carbon. Thus it lacks acidic hydrogen, so all other compounds are more acidic than it.
In compound (c) and (a) i.e., But-1-yne and Propyne has methyl groups which shows + I effect attached to triple bond. As the number of groups which gives + I effect increases, acidic character decreases. (CH3→ gives +I effect)
Thus, ethyne does not have any +I group and it has two sp hydridised hydrogen atom which make it most acidic of all four compounds.
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