Organic Compounds Containing Halogens Question 188
Question: Among the following the most reactive towards alcoholic KOH is
[AIIMS 2004]
Options:
A) $ CH_2=CHBr $
B) $ CH_3COCH_2CH_2Br $
C) $ CH_3CH_2Br $
D) $ CH_3CH_2CH_2Br $
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Answer:
Correct Answer: D
Solution:
The polarity between C-X bond increases by increasing the +I effect which increases by increasing the alkyl group by which X of C-X easily eliminates.
In $ CH_3CH_2CH_2Br $ the polarity is maximum due to 3 alkyl groups while in other compounds polarity decreases due to the presence of double bond, presence of -CO group (-I) and less number of alkyl groups.
$ CH_3CH_2CH_2Br+KOH\xrightarrow{alc\text{.}} $
$ CH_3CH=CH_2+HBr+H_2O $
BETA
