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MCQ on IR spectroscopy: Page-6

M-18 peak is observed in

(A) Amines

(B) Benzyl alcohols

(C) Aldehydes

(D) Carboxylic acid

Also primary alcohols due to loss of water

Which of the flowing fragment ion is more likely to be formed in MS

(A) Benzylic

(B) Allylic

(C) 3 o carbocation

(D) 1 o carbocation

As the branching increases, the intensity of molecular ion peak of hydrocarbons

(A) Increases

(B) Decreases

(C) No change

(D) Variable

The fragment ion observed in alkynes corresponds to

(A) 28

(B) 41

(C) 39

(D) 31

Propargyl ion