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Which of the following molecules possess...

Which of the following molecules possesses only one `pi` bond ?

A

(1) `CH-=CH`

B

(2) `CH_(2)=CH-CHO`

C

(3) `CH_(3)CH=CHCOOH`

D

(4) `CH_(3)CH=CH_(2)`

Text Solution

Verified by Experts

The correct Answer is:
D
Every double bond has one `pi` bond every triple bond has two `pi` bonds.
`CHunderset(2 pi bonds)(-=CH)` , `CH_(2)=underset(2 pi bonds)(CH)-CH=O`
`CH_(3)CH=underset(2 pi "bonds")(CH)overset(O)overset(||)(C )-OH` , `CH_(3)underset(2 pi "bonds")(CH)= CH_(2)`
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