Among the following the number of reactions that produces benzaldehyde is _________.

Consider all possible isomeric ketones including stereoisomers of MW = 100. All these isomers are independently reacted with NaBH₄ (Note : stereoisomers are also reacted separately). The total number of ketones that give a racemic product(s) is/are

The total number of carboxylic acid groups is the product P is _________.

In the scheme given below, the total number of intra molecular aldol condensation products formed from Y is ____________.