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Exam (elaborations)
CHEM 238 EXAM 2025 QUESTIONS AND ANSWERS
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---7May 20252024/2025A+
- Which of the following is a suitable reagent that will quickly distinguish between pentanal an 3- 
pentanone? - ANS Tollen's Reagent (Tollen's test takes advantage of the relative ease of 
oxidation of an aldehyde to a carboxylic acid..silver(I) dissolved in aqueous ammonia. pg 97 of 
manual) 
In the aldol condensation, the base: - ANS is the first step of the base catalyzed by 
mechanism, a hydroxide (base) ion abstracts one of the alpha-hydrogens to produce the 
enolate. (pg 285) 
Choose...
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Exam (elaborations)
CHEM 238 EXAM 2025 QUESTIONS AND ANSWERS
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--24May 20252024/2025A+Available in bundle
- 3 | P a g e C o p y r i g h t © 2 0 2 5 T H E B R I G H T A L L R I G H T S R E S E R V E D 
I. II. III. 
a. I only 
b. I and II 
c. II and III 
d. I and III 
e. I, II, and III - ANS b. I and II 
How are triazine herbicides prepared? 
a. electrophilic aromatic substitution 
b. SN2 
c. nucleophilic aromatic substitution 
d. dehydrohalogenation 
e. SN1 - ANS c. nucleophilic aromatic substitution 
Which among the derivatives of carboxylic acids are the least reactive towards hydrolysis? 
a. esters...
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Thebright