i) Aromatic aldehydes are less reactive than aliphatic aldehydes towards nucleophilic addition reactions. ii) For aldol condensation aldehyde must contain α-hydrogen.

iii) Crossed claisen condensation in not of synthetic importance. 

i) Aromatic aldehydes are less reactive than aliphatic aldehydes towards nucleophilic addition reactions: This statement is true. Aromatic aldehydes contain an electron-withdrawing group (-C=O) attached to the aromatic ring, which makes the carbonyl carbon less electrophilic and less reactive towards nucleophilic addition reactions compared to __________ ________ ___ _____ _____ __________ _____ ____ ________.
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