When , CH3-CH2MgBr is treated with CO2 , CH3CH2COOH is formed , The C of -COOH group comes from -
methylene group
-CH3 group
from CO2 gas
None of these
As we learnt ,
Grignard reagent with CO2 (dry ice) forms carboxylic acid via carboxylic acid salt as intermediate.
Carbon of -COOH group comes from CO2 gas.
Hence, the correct answer is Option (3)
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