在理论上不能用于设计原电池的化学反应是 （    ）

A．HCl ( aq ) + NaOH ( aq ) =" NaCl" ( aq ) + H2O ( l ) △H < 0

B．2CH3OH ( l ) +3O2 ( g ) = 2CO2 ( g ) + 4H2O ( l )△H < 0

C．4Fe (OH)2 ( s ) + 2H2O ( l ) + O2 ( g ) =" 4Fe" (OH)3( s )△H < 0

D．2H2 ( g ) + O2 ( g ) = 2H2O ( l )△H < 0