Select reagents from the table to synthesize this compound f

Select reagents from the table to synthesize this compound from cyclopentanone.

Solution

THIS IS SIMPLE ALDOL CONDENSATIOON...cyclopentanone+2 eq.C6H5CHO in presence of base NaOH/Ethanol..folowed by heating and hydrolysis gives the product

Heating is very important to get conjugated double bond..Other base like LDA can be used but not preferably because it is very strong and favours elimination of Hydrogen ion from cyclopentanone carbanion to give cyclopentanone-2-ene