Which of the following is expected to be the base peak in the mass spectrum of pentanal? 
Definitions:
Decline
A gradual deterioration in condition, quality, or level.
Abstinence Syndrome
A characteristic cluster of symptoms that results from a sudden decrease in the level of usage of a substance.
Sudden Decrease
An abrupt reduction or drop in a quantity or quality, which can relate to anything from financial markets to personal health.
Conventional Thought
A stage of cognitive development where individuals' reasoning becomes based on conformity to social standards, rules, and laws.
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