Which is a stronger Lewis acid in each of the following pairs?
  (a) `Sn^(2+)` or `Sn^(4+)` (b) `BF_(3)`, or `BH_(3)`

Which of the following are SN^2 reactions ?

Why is BF_(3) a Lewis acid?

Which of the following will give SN^(2) mechanism?

Balance the following equations a. Fe^(2+) + Sn^(+2) rarr Sn^(4+) + fe^(2+)

Describe the principle of extraction of each of the following : (a) Sn from SnO_(2) (b) Zn from ZnO ( c) Cr from Cr_(2) O_(3) .

Which of the followings are Lewis acids: H_(2)O, BF_(3), H^(o+) and NH_(4) ?

Which of the followings are Lewis acids: H_(2)O, BF_(3), H^(o+) and NH_(4) ?

Which of the following has larger bond angle in the following pairs ? (a)NH_(3),PH_(3)(b)BeF_(2),BF_(3)(c )H_(2)O,CO_(2)(d)H_(2)O,H_(2)S(e)C CL_(4),C_(2)H_(2) ?

What is ‘A’ in the following reaction? 2Fe^(3+) (aq) + Sn^(2+) (aq) rarr 2 Fe^(2+) (aq) + A

Which of the following compounds gives SN^(1), SN^(2) and SN^(2) mechanisms?