question_answer

The major product obtained after reaction and number of chiral centre is

A)                   

B)

C)                                      

D)  

Correct Answer: C

Solution :

  Idea This problem includes conceptual mixing of reduction of cyanide, carbonyl, intramolecular    nucleophilic    addition reaction and ring cyclisation. 1st step is a reduction of cyanide and carbonyl group. 2nd step is intramolecular nucleophilic substitution reaction. Chiral centre The carbon atom attached to four different substituent are known as chiral centre. Total number of chiral centre = 3. TEST Edge Similar road map problems are also asked in JEE Main including Wurtz reaction, Robinson annelation reaction. So, students should go through these using corbanion as an intermediate.