Organic Chemistry
There will be no free rotation around the C3−C4 bond due to the presence of a pi bond.
There will be a free rotation around the C3−C4 bond due to the presence of a pi bond.
There will be no free rotation around the C3−C4 bond due to the presence of a sigma bond.
There will be a free rotation around the C3−C4 bond due to the presence of a sigma bond.