Predict the missing component of each reaction.

1. $CH_4+2 O_2 \rightarrow ?$
   
2. $?+2 NaBr \rightarrow 2 NaCl + Br _2$
   

Options:

• CHO
  
• HCl
  
• $C _2 H _2+ CO _2$
  
• $Cl _2$
  
• $CO _2+2 H _2 O$
  
• Na
  
• $C +2 H _2 O$
  
• HBr