Write increasing order of basic strength of following:
(i). (a) `F^(ɵ)`, (b). `Cl^(ɵ)`, (c). `Br^(ɵ)`, (d). `I^(ɵ)`
(A). `a gt b gt c gt d`
(B). `d lt a lt c lt b`
(C). `d gt a gt b gt c`
(D). `a gt d gt c gt b`
(ii). (a). `CH_(3)^(ɵ)`, (b). `Cl^(ɵ)`, (c) `OH^(ɵ)`, (d). `F^(ɵ)`
(A). `a gt b gt c gt d`
(B). `d lt a lt c lt b`
(C). `d gt a gt b gt c`
(D). `a gt d gt c gt b`
(iii). (a). `R-NH_(2)`, (b). `Ph-NH_(2)`, (c). `R-underset(O)underset(||)(C)-NH_(2)`
(A). `a gt b gt c`
(B). `a lt c lt b`
(C). `a lt b lt c`
(D). `a gt c gt b`
(iv). (a). `NH_(3)`, (b). `MeNH_(2)`, (c). `Me_(2)NH` , (d). `Me_(2)N`
(A). `a lt b lt c lt d`
(B). `d lt a lt c lt b`
(C). `d gt a gt b gt c`
(D). `a gt d gt c gt b`

Answer

(i)A, (ii)A, (iii)A, (iv)A

Explanation

Basic strength : The anion which is less stable take more `H^(+)`.
(iii). In option (B) & (C) 1. pair involve in resonance.
(iv). In gas phase order `-3^(@)gt2^(@)gt1^(@)gtNH_(3)`