The colorless solution of the following substances can be identified without other reagents：
<1> KOH , Na2SO4 , AlCl3
<2>NaHCO3 , Ba(OH)2 , H2SO4
<3>HCl , NaAlO2 , NaHSO4
<4>Ca(OH)2 , Na2CO3 , BaCl2

A. <1><2>
B.<2><3>
C.<1><3><4>
D <1><2><4>

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Indicate whether the specified alkyl halides will form primarily substitution products, only elimination products, both substitution and elimination products, or no products when they react with sodium methoxide. 1-bromobutane 1-bromo-2-methylpropane 2-bromobutane 2-bromo-2-methylpropane