Question

23. Consider the expected 'H NMR spectrum of 2,4-dimethyl-1,4-pentadiene. Which of the following is likely to be observed? 4.31 A) 3 signals: all singlets B) 7 signals: all singlets C) 4 signals: two singlets, two doublets D) 4 signals: all singlets E) 3 signals: one singlet, 2 doublets 2..3
Please explain! Some answers say 3 signals, some say 4 signals and I don’t understand

Answer 1

ANSWER:

The number of peak in ¹H NMR spectrum of 2,4-dimethyl-1,4-pentadiene is:

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That means this compound will show 4 signal in which two signal (i.e. 1 & 2) will show doublet and another two signal will show singlet. Hence, option (C) is correct.