question_answer

Which of the following would give Hofmann alkene?

(I)

(II)

(III)

(IV)

A) I, II             

B)        II, IV                  

C) I, III                

D)        II, III

Correct Answer: C

Solution :

[c] The oxidation of \[3{}^\circ \] amine to amine oxide followed by Cope reaction on heating gives Hofmann alkene (less substituted). (ii) (II) will not give Hofmann alkene. Benzylic H atom is more acidic due to \[(-I)\] effect of Ph. (II) would give (iii) (Ill) will give Hofmann alkene \[C{{H}_{2}}=C{{H}_{2}}\] (iv) (IV) will not give Hofmann alkene (Cope reaction). Same explanation as in (ii) above