Please give more explanations for these questions

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Please give more explanations for these questions.

(1) Of the molecules below, only ________ is polar. 
A) CCl4
B) CH4
C) SeF4
D) SiCl4

 

(2) Of the molecules below, only ________ is nonpolar. 
A) BF3
B) NF3
C) IF3
D) PBr3
E) BrCl3

 

(3) Which of the molecules has a see-saw shape? 
(i) PCl3 (ii) CCl4 (iii) TeCl4 (iv) XeF4 (v) SF6
A) (i)
B) (ii)
C) (iii)
D) (iv)
E) (v)

 

(4) There are ________ σ bonds and ________ π bonds in H3C-CH2-CH=CH-CH2-C≡CH. 
A) 14, 2
B) 10, 3
C) 12, 2
D) 13, 2
E) 16, 3

 

(5) According to valence bond theory, which orbitals overlap in the formation of the bond in Cl2? 
A) 4p on Cl and 4p on Cl
B) 3p on Cl and 3p on Cl
C) sp on Cl and sp on Cl
D) 3s on Cl and 3s on Cl
E) 2p on Cl and 2p on Cl