Question: is formaldehyde more reactive than benzaldehyde?
Answer: where as in formaldehyde the -h groups attached to the carbonyl carbon get a highly positive change and thus more reactive than that of benzaldehyde. Formaldehyde has a H- (Hydrogen) attached to the Carbonyl carbon of -CHO (aldehyde) group. Whereas , Benzaldehyde has a Ph- (Phenyl) group attached.