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MCQ on IR spectroscopy: Page-3

Identify the peak corresponding to McLafferty rearrangement in the following compound. 2-pentanone

28

(B) 31

(C) 43

(D) 58

2. The base peak in mass spectroscopy may be of

(A) M ion

(B) M-12 ion

(C) Either M or M-12

(D) None of the above

3. The molecular ion peak is

(A) M+ ion

(B) M-12

(C) M+1 peak

(D) M-1 peak

Which ion is more stable

(A) M+ ion

(B) M-12 ion

(C) Stability can’t be predicted

(D) Both are equally stable

5. All of the following material can be used as matrix in MALDI, except

(A) Sinapinic acid

(B) Nicotinic acid

(C) Pyrazine-2-carboxylic acid

(D) p-Amino benzoic acid