Which of the labeled hydrogen atoms in the following structure is the most acidic? 
Definitions:
Substitute
An alternative or replacement for something else, often found or used when the original is unavailable or unsuitable.
Extend
To prolong the duration of something or to reach out in space or time.
Course of Dealing
A pattern of actions between parties that establishes a common basis for understanding in future transactions.
Usage of Trade
Established customs and practices in a particular industry that are considered binding or enforceable in business transactions.
Q18: Which compound would be expected to show
Q19: When camphor undergoes nucleophilic attack by CH<sub>3</sub>CH<sub>2</sub>MgBr,the
Q33: Which would be more appropriate as the
Q42: Which of the following aromatic compounds is
Q66: In electron ionization,a sample is bombarded with
Q68: Provide the major organic product(s)of the reaction
Q84: Which of the following statements best describes
Q100: What is the major product of the
Q112: Bromination of benzene requires a Lewis acid
Q124: Rank the following groups in order of