Question

What will be the correct stability order of the different conformations of $n$ -butane ?

• A. Fully-eclipsed $>$ eclipsed $>$ gauche $>$ anti-staggered
• B. Anti-staggered $>$ eclipsed $>$ gauche $>$ fully-eclipsed
• C. Anti-staggered $>$ gauche $>$ eclipsed $>$ fully-eclipsed
• D. Gauche $>$ anti-staggered $>$ eclipsed $>$ fully-eclipsed

Answer 1

Answer: (C)

The overall stability order is : (IV) > (II) > (III) > (I)
i.e. Anti (staggered) $>$ Gauche (skew) $>$ Eclipsed $>$ Fully eclipsed