Explain the observation:
`(CH_3)_(3)C CH_(2)Clunderset(300^(@)C)overset(AlCl_(3))(rarr)(CH_3)_(2)C ClCH_(2)CH_(3)`

Consider the reactions: (i) (CH_3)_(2)CH-CH_(2)Broverset(C_(2)H_(5)OH)(rarr)(CH_3)_(2)CH-CH_(2)OC_(2)H_(5)+HBr (ii) (CH_3)_(2)CH-CH_(2)Broverset(C_(2)H_(5)O^(-))(rarr)(CH_3)_(2)CH-CH_(2)OC_(2)H_(5)+Br^(-) . Mechanism of reactions (i) and (ii) are respectively-

Complete the reaction : CH_(3)-underset(CH_(3))underset(|)(CH)-O-CH_(2)-CH_(3)overset(HI)rarr

2 -chloro 2 - methylpentane on reaction with sodium methoxide in methanol yields : C_(2)H_(5)CH_(2)underset((a))underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-OCH_(3) " " C_(2)H_(5)CH_(2)underset((b))underset(CH_(3))underset(|)C =CH_(2) " " C_(2)H_(5)CH=underset ((c))underset (CH_(3))underset(|)C-CH_(3)

Arrange the following compounds in the order of increasing S_(N)2 reactivity and explain the order: CH_(3)CH_(2)CH_(2)Br, CH_(3)CH_(3)Br, (CH_3)_(3)C CH_(2)Br, (CH_3)_(2)CHCH_(2)Br.

Major product of the given reaction is CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-underset(CI)underset(|)(CH)-CH_(3)overset(C_(2)H_(5)O^-)rarr