Which of the following reactions will give Hoffmann alkene as a major product?

Which of the following alkyl halides gives the most complex mixture of alkenes in an $E_2$ reaction?

The given compound $CH_3-O-CH_2-Br$ undergoes which of the following reactions?

Examine the following statements pertaining to an $S_N2$ reaction:
$(1)$ The rate of reaction is independent of the concentration of the nucleophile.
$(2)$ The nucleophile attacks the $C$ atom on the side of the molecule opposite to the group being displaced.
$(3)$ The reaction proceeds with simultaneous bond formation and bond rupture/cleavage.
Amongst the following,which of the above are true?

Predict the major product for the following $E2$ elimination reaction:

Explain why:
$(i)$ the dipole moment of chlorobenzene is lower than that of cyclohexyl chloride?
$(ii)$ alkyl halides,though polar,are immiscible with water?
$(iii)$ Grignard reagents should be prepared under anhydrous conditions?