Hydrocarbons - Result Question 14
####18. 2,3-Dimethyl-2-butene can be prepared by heating which of the following compounds with a strong acid ?
[2015 RS]
(a) $(CH_3)_2 CH-CH-CH=CH_2$
(b) $(CH_3)_3 C-CH=CH_2$
(c) $(CH_3)_2 C=CH-CH_2-CH_3$
(d) $(CH_3)_2 CH-CH_2-CH=CH_2$
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Solution:
- (b)
CC(C)=C(C)C
2,3-Dimethyl-2-butene
(a) $(CH_3)_2 CH-CH-CH=CH_2$ contain 7 carbon atoms $\stackrel{+}CH_3$
(b)
$ 2 RCOOK \xrightarrow[\text{ Oxidation }]{\text{ Electrolytic }} \underset{\text{ Anode }}{2 RCOO^{-}}+\underset{\text{ Cathode }}{2 K^{+}} $
At anode $2 RCOO^{-} \to 2 RCOO+2 e^{-} \longrightarrow$
$ R-R+2 CO_2 $
$ \begin{matrix} \text{ At Cathode } & 2 K^{+}+2 e^{-} \to 2 K \\ & 2 K+H_2 O \to 2 KOH+H_2 \uparrow \end{matrix} $
