Question

Which statement is incorrect:

• A. In ethylene glycol gauche form is more stable than anti form due to intramolecular $H-$ bonding.
• B. Anti form and gauche form have same torsional strain in butane about $C_{2}-C_{3}$ bond.
• C. In case of $\text{X-CH}_{2}\text{-CH}_{2}\text{-X }$ $\left[\text{where X is halogen}\right]$ , anti form is more stable than gauche form about $C-C$ bond, for all halogen
• D. For skew form dihedral angle is $0^\circ < \theta < 60^\circ $

Answer 1

Answer: (C)

$F-CH_{2}-CH_{2}-F,$ Gauche form has greater stability due to gauche effect, then anti form.