Most stable conformation of n-butane is :

The most stable conformation of butane is:

The least stable conformation of n-butane is

In the following the most stable conformation m-butane is:

The dihedral angle of the most stable anti-conformation of n-butane is

In the following the most stable configuration of n - butane is

Most stable conformation of ethanol is :

Among the following conformation that corresponds to the most stable conformation of meso-butane-2,3-diol is

Which of the follwing is the most stable conformation of ethane?