Which of the following alkynes is least acidic?

C H_{3} C \equiv C H

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C H_{3} C \equiv C C H_{3}

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C H_{3} C H_{2} C \equiv C H

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C H \equiv C H

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Solution

The correct option is B $C H_{3} C \equiv C C H_{3}$
But-2-yne has no hydrogen attached to sp hybridised carbon. So all other compounds are more acidic than it and is least acidic.
But -1-yne and Propyne have groups having + I effect ( $C H_{3} \to$ give + I effect) attached to triple bond. As the number of groups which give +1 effect increases, acidic character decreases.
Acetylene is most acidic among all.
Hence correct option is b.

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Which organic compound among the following is not an isomer of $C H_{3} - C O - C H_{2} C H_{2} C H_{2} C H_{3}$ ?

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