Should be 1 I think. What's the answer?
Yes it is..can u explain.. @anon
In 3 and 4 the net dipole is zero as the vectors cancel out each other. In cis but-2-ene dipole moment is there but less in comparison to one because O has lone pair and the vectors support the lone pair hence increasing the dipole moment.
Yes A should be correct
Got it @anon