JEE Advanced2023ChemistryAldehydes and KetonesActual
In the following reactions, P, Q, R and S are the major products. The correct statement(s) about P, Q, R and S is(are)
Options
- ABoth P and Q have asymmetric carbon(s)
- BBoth Q and R have asymmetric carbon(s)
- CBoth P and R have asymmetric carbon(s)
- DP has asymmetric carbon(s), S does not have any asymmetric carbon
Correct answer
C. Both P and R have asymmetric carbon(s)
Step-by-step solution
The cyanide part undergoes reaction with phenyl magnesium bromide followed by acidic water give a ketone. The ketone undergoes reaction with phenyl magnesium bromide again to get a tertiary alcohol. Benzene undergo Friedel craft acylation and gives acetophenone. Acetophenone gives a tertiary alcohol upon reaction with phenyl magnesium bromide. Propanoyl chloride when treated with dibenzyl cadmium gives a ketone. The ketone give tertiary alcohol on reaction with phenyl magnesium bromide. 2-phenyl ethanal gives 1,2-d