Consider the following species:
(i) `CH_(3)^(+)`
(ii) `(C_(3)H_(5))_(3)Al`
(iii) `HCHO`
(iv) `CH_(4)`
(v) `(C_(2)H_(5))_(3)N`
(vI) `TiCl_(4)`
(vii) `CO_(2)`
(viii) `SiCl_(4)`
(ix) `BF_(3)`
the find out total number of species which can act as Lewis acid.

Classify the following into polar and non-polar molecules: (i) CO_(2) , (ii) CHCI_(3) , (iii) C CI_(4) , (iv) CH_(3)OCH_(3) , (v) C_(2)H_(5)OH , (vi) C_(2)H_(6) , (vii) CH_(2)CI_(2) , (viii) NH_(3) , (ix) H_(2)O , (x) CH_(3)CI .

Predict which out of the following species are planar. (i) NH_(4)^(+) (ii)CH_(3)^(+)(ii)SF_(4)(iv)OF_(2)(v)H_(2)O

Write the empirical formulae of the following compounds. (i) C_(6)H_(6) (ii) Na_(2)CO_(3) (iii) C_(6)H_(12)O_(6) (iv) H_(2)O_(2) (v) CH_(3)COOH (vi) CuSO_(4)

Which of the following in each pair has larger bond angle (i) CO_(2) , BF_(3) (ii) H_(2)O, H_(2)S (iii) CH_(4), C_(2)H_(2)

Among NH_(3) , H_(2)O , OH^(-) , H^(+) , CO_(2) , C_(2)H_(4) and BF_(3) ,the total number of lewis bases are

Find the the valency factor for following acids (i) CH_(3)CO OH " " (ii) NaH_(2)PO_(4) " " (iii) H_(3)BO_(3)

Consider the following species: CF_(4),GeH_(4),BCl_(3),AlBr_(3),H_(2)O,PH_(3),PCl_(5),CO_(2),CH_(4) and calculate value of (x-y)^(2) : Where, x: Total number of species which can act as only lewis acid. y: total number of species which can act as lewis acid as well as lewis base.

The S_(N^(1)) reactivity of the following halides will be in the order: (i) (CH_(3))_(3)C-Br (ii) (C_(6)H_(5))CHBr (iii) (C_(6)H_(5))_(2)C(CH_(3))Br (iv) (CH_(3))_(2)CHBr (v) C_(2)H_(5)Br