Q78 · CSIR-NET Chemistry, December 2011
Paper: CSIR-NET December 2011 · Subject: Organic Chemistry · Chapter: Photochemical Reactions · Topic: Photocycloaddition · Marks: 2 · Difficulty: Hard
Match the following starting compounds with corresponding products in photochemical reactions: Starting material / Products (i) 
(A) 
(ii) 
(B) 
(iii) 
(C) 
(D) 
(E) 
(A) (ii) (B) (iii) (C) (D) (E) (a)(i)-(E) (ii)-(A) (iii)-(B)
(b)(i)-(A) (ii)-(C) (iii)-(D)
(c)(i)-(D) (ii)-(C) (iii)-(A)
(d)(i)-(E) (ii)-(A) (iii)-(D)
Answer
Answer: A ✓ checked by 4AB · confidence medium
The source book printed no answer; this one was worked out and checked — see the explanation.
Explanation
2-Heptanone undergoes Norrish II/Yang cyclisation to the cyclobutanol E. 2-Methylcyclohexanone undergoes Norrish I α-cleavage and H transfer to the unsaturated aldehyde A (a).
Study loop for Photochemical Reactions