Q66 · CSIR-NET Chemistry, June 2013
Paper: CSIR-NET June 2013 · Subject: Organic Chemistry · Chapter: Organic Spectroscopy · Topic: Organic Spectroscopy – General · Marks: 2 · Difficulty: Medium
In the broad band decoupled ${ }^{13} \mathrm{C} \mathrm{NMR}$ spectrum, the number of signals appearing for the two pyrene diols A and B 
(A) 
(B)
(A) (B)(a)eight and eight
(b)eight and sixteen
(c)five and ten
(d)five and eight.
Answer
Answer: D ✓ checked by 4AB · confidence medium
The source book printed C; on checking, D is correct — see the explanation.
Explanation
Pyrene-2,7-diol (D₂h) has five distinct carbons. Pyrene-1,6-diol (C₂h) has eight (d).
Study loop for Organic Spectroscopy