Question

Polarisation of electrons in acrolein may be written as :
A. `overset(delta+)(C)H_(2)=CH-CH=overset(delta-)(O)`
B. `overset(delta+)(C)H_(2)=overset(delta+)(C)H-CH=O`
C. `overset(delta+)(C)H_(2)=CH-CH=overset(delta+)(O)`
D. `overset(delta-)(C)H_(2)=CH-overset(delta+)(C)H=O`

Answer 1

Correct Answer - A
In `CH_(2)=CH-CHO` due to -M- effect of -CHO group, polarisation of electron takes place as follows:

Hence, partial polarisation is represented as
`overset(delta+)(CH_(2))=CH-CH=overset(delta+)(O)`