The rate of the reaction is influenced by the hyperconjugation effect of group R. If R sequentially is I. CH 3- II. CH 3- CH 2- III. H3C - undersetCH underset|CH3 Iv. the increasing order of speed of the above reaction is

Question

The rate of the reaction

is influenced by the hyperconjugation effect of group R. If R sequentially is I. CH 3- II. CH 3- CH 2- III. H3C - undersetCH underset|CH3 Iv.

the increasing order of speed of the above reaction is (A) IV, III, II, I (B) I, II, III, IV (C) I, IV, III, II (D) III, II, I, IV

Tardigrade Admin · Accepted Answer

More the number of H -atoms on the α -carbon of the group R, more are the hyperconjugating structures, weaker is the C - Br bond and hence, higher is the rate of the reaction. Now since CH 3 has three, ethyl has two, iso-propyl has one and tert-butyl group has no α -hydrogen therefore, hyperconjugation effect decreases and hence the rate decreases in the same order.

Q. The rate of the reaction is influenced by the hyperconjugation effect of group R. If R sequentially is I. CH3​− II. CH3​−CH2​− III. H3​C−CH∣CH3​​​ Iv. the increasing order of speed of the above reaction is

IV, III, II, I

I, II, III, IV

I, IV, III, II

III, II, I, IV

Q. The rate of the reaction

is influenced by the hyperconjugation effect of group $R$ . If $R$ sequentially is
I. $C H_{3} -$
II. $C H_{3} - C H_{2} -$
III. $H_{3} C - C H ∣ C H_{3}$
Iv.
the increasing order of speed of the above reaction is