Hydrocarbons Question 222
Question: n-pentane and iso pentane can be distinguished by [BVP 2004]
Options:
A) $ Br_2 $
B) $ O_3 $
C) conc. $ H_2SO_4 $
D) $ KMnO_4 $
Show Answer
Answer:
Correct Answer: D
Solution:
On oxidation, with $ KMnO_4 $ , they give different alcohols
$ \underset{n\text{ pentane}}{\mathop{CH_3CH_2CH_2CH_2CH_3}}\underset{[O]}{\mathop{\xrightarrow{KMnO_4}}} $
$ \underset{1{}^\circ \text{ alcohol}}{\mathop{CH_3CH_2CH_2CH_2CHOH_2}} $
$ CH_3CH_2-\underset{CH_3}{\mathop{\underset{|}{\mathop{C}}H}}-CH_3\underset{[O]}{\mathop{\xrightarrow{KMnO_4}}} $
$ \underset{3{}^\circ \text{ alcohol}}{\mathop{CH_3CH_2-\underset{CH_3}{\overset{OH}{\mathop{\underset{|}{\overset{|}{\mathop{C}}}-C}}}H_3}} $
BETA
