Question

91) Highest peak in mass spectrum is called as?
a) Isotopic peak
b) base peak
c) Molecular ion peak
d) ionic peak​

Answer 1

b) base peak

Hope it helps you

Answer 2

Answer:

b) base peak.

Explanation:

The base peak in toluene is due to loss of a hydrogen atom to form the relatively stable benzyl cation. This is thought to undergo rearrangement to form the very stable tropylium cation, and this strong peak at m/e = 91 is a hallmark of compounds containing a benzyl unit.