[" Which one would undergo "S_(N)2" reaction faster in the following pair? "],[CH_(3)-CH_(2)-Br" and "CH_(5)-C-Br],[CH_(3)]

Which would undergo S_(N^(2)) reaction faster in the following pair and why? CH_(3)-CH_(2)-Br and CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-Br .

Which would undergo S_(N)2 reaction faster in the following pair and why? CH_(3)-CH_(2)-Br and CH_(3)-undersetunderset(Br)(|)oversetoverset(CH_(3))(|)(C)-CH_(3)

Which would undergo SN^1 reaction faster in the following pair and why ? (CH_3-CH_2-Br & (CH_3)_3 C-Br

Which would undergo S_(N)1 reaction faster in the following pair : CH_(3)-CH_(2)-CH_(2)-Br and CH_(3)-underset(Br)underset(|)CH-CH_(3)

Which would undergo S_(N)1 reaction faster in the following pair : CH_(3)-CH_(2)-CH_(2)-Br and CH_(3)-underset(Br)underset(|)CH-CH_(3)

Which would undergo S_(N)1 reaction faster in the following pair? CH_(3)-CH_(2)-CH_(2)-BrandCH_(3)-undersetunderset(Br)(|)(C)H-CH_(3)