A) \[C{{H}_{4}}\]
B) \[{{C}_{2}}{{H}_{6}}\]
C) \[CH\equiv CH\]
D) \[{{C}_{2}}{{H}_{5}}OH\]
Correct Answer: D
Solution :
Key Idea: Proton donors are acids. Among given choices \[{{C}_{2}}{{H}_{5}}OH\]can give proton \[({{H}^{+}})\] most easily. \[\therefore \] \[{{C}_{2}}{{H}_{5}}OH\] is most acidic among \[{{C}_{6}}{{H}_{6}},C{{H}_{4}}\]\[CH\equiv CH\]and \[{{C}_{2}}{{H}_{5}}OH\]
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