Question

Choose the incorrect statement(s) among the following:

• A. There are only six conformers for n-butane
• B. The keto form of acetylacetone in n-hexane is stable than the enol form
• C. The gauche form of ethylene glycol is more stable
• D. 8 isomers are possible for $C_4{H}_6$

Answer 1

Answer: (A), (B), (D)

The correct options are
A There are only six conformers for n-butane
B The keto form of acetylacetone in n-hexane is stable than the enol form
D 8 isomers are possible for $C_4{H}_6$

a) Infinite number of conformers are possible for n-butane as infinite number of orientation can be possible by rotation about $C-C$ bond.

b) In non-polar solvents like n-hexane enol form of acetylacetone dominates over keto form.

c) The gauche form of ethylene glycol is more stable due to hydrogen bonding.

d) DBU of $C_4{H}_6$ is 2. More than 8 isomers are possible for this formula.