MCQ
Which of the following has the lowest barrier to rotation about the indicated bond ?
- A

- B

- ✓

- D







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$(A)$ Ice floats in water.
$(B)$ Higher Lewis basicity of primary amines than tertiary amines in aqueous solutions.
$(C)$ Formic acid is more acidic than acetic acid.
$(D)$ Dimerisation of acetic acid in benzene.