The most stable conformation of $n-$butane is

Explain sawhorse projection with examples.

What is the increasing order of stability for the three main conformers (e.g.,eclipsed,anti,gauche) of $2$-fluoroethanol?

The structures shown below represent .......

Define torsional strain.

In the Newman projection for $2,2$-dimethylbutane,what can $X$ and $Y$ respectively be?
$A$. $H$ and $H$
$B$. $H$ and $C_2H_5$
$C$. $C_2H_5$ and $H$
$D$. $CH_3$ and $CH_3$