ABC26OR0125 · Organic Spectroscopy
Subject: Organic Chemistry · Chapter: Organic Spectroscopy · Topic: NMR 13C · Exam: CSIR-NET JUNE 2013 · Marks: 2 · Difficulty: Medium
In the broad band decoupled $^{13}$C 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 (as printed): C
Explanation
To count the number of signals, pass the $\mathrm{C_{2}}$ axis and count the number of carbons on either side of the $\mathrm{C_{2}}$ axis. Carbons on either side of $\mathrm{C_{2}}$ axis will give same signal.