In which reaction product formation takes place by hoffmann rule?

In which reaction product formation takes place by hoffmann rule? Correct Answer I, II, III and IV

All of the above molecules will form product by hoffmann rule that is less substituted C-H bond will be attacked because more stable product will be formed via this in all cases. I. II. When leaving group are F & NH2 type then they give hoffmann product. III. IV.

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