JEE Main Chemistry question

Which statement is true regarding the acidity and C–H bond distance in ethane, ethene and acetylene?

(A)Acetylene is the weakest acid and has the longest C–H bond distance
(B)Acetylene is the strongest acid and has the shortest C–H bond distanceCorrect
(C)Ethane is the strongest acid and has the longest C–H bond distance
(D)Ethene is the strongest acid and has the shortest C–H bond distance

Answer: (B)

Solution

Increasing -character (, i.e. ethane ethene acetylene) both shortens the C–H bond (the bonding electrons sit closer to the more electronegative-behaving -rich carbon) and increases

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Question ID VK-142432