Which among th the following is the weakest acid?

C H_{3} C O O H

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C_{6} H_{5} O H

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H_{2} O

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C_{2} H_{2}

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Solution

The correct option is D $C_{2} H_{2}$
Compared to most hydrocarbons,acetylene is relatively acidic though it is still much less acidic than water or ethanol. Thus it reacts with strong bases to form acetylide salts e.g. acetylene reacts with sodium amide in liquid ammonia to form sodium acetylide and with butylithium in cold THF to give lithium acetylide. So it is least acidic character as compared to others.

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Similar questions

Which among the following is the weakest acid?

Give th empirical formula of:
(a) $C_{6} H_{6},$ (b) $C_{6} H_{12} O_{6},$
(C) $C_{2} H_{2},$ (d) $C H_{3} C O O H .$

C a C_{2} + H_{2} O \to A H_{2} S O_{4} / H g S O_{4} - -------- \to B

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