Some Basic Principles Of Organic Chemistry Question 23
Question: Select the molecule which has only one $ \pi -bond $ [Pb. PMT 1998]
Options:
A) $ CH\equiv CH $
B) $ CH_2=CHCHO $
C) $ CH_3CH=CH_2 $
D) $ CH_3CH=CHCOOH $
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Answer:
Correct Answer: C
Solution:
a.
$ \underset{2\pi -bonds}{\mathop{H-C\equiv C-H}}, $ b.
$ \underset{2\pi -bonds}{\mathop{CH_2=CH-\underset{H}{\mathop{\underset{|}{\mathop{C}},}},=O}}, $ c.
$ \underset{1\pi \text{ bond}}{\mathop{CH_3CH=CH_2}}, $ d.
$ \underset{2\pi -bonds}{\mathop{CH_3-CH=CH-}},\underset{O}{\mathop{\underset{|,|}{\mathop{C}},}},-OH $
