Hydrocarbons - Result Question 49
####32. Acidic hydrogen is present in
$(1985,1 M)$
(a) ethyne
(b) ethene
(c) benzene
(d) ethane
$(1984,1 M)$
(a) alkaline permanganate solution
(b) acidified permanganate solution
(c) neutral permanganate solution
(d) aqueous bromine solution
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Answer:
Correct Answer: 32. (c)
Solution:
- Terminal alkynes are slightly acidic, forms salt with very strong base like $Na, NaNH _2$ etc.
$$ \underset{\text { ethyne }}{H}-C \equiv C-H+Na \xrightarrow{\Delta} H-C \equiv C^{-} Na^{+}+\frac{1}{2} H _2 \uparrow $$
