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Chem 120 final exam questions WITH Accurate Answers
Chem 120 final exam questions WITH Accurate Answers
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Chem 120 final exam questions WITHAccurate Answers
What is the correct order of melting points for the following alkanes, from
highest to lowest temperature? - -heptane > hexane > ethane > methane
-2. Given an alkane that contains 25 carbon atoms. How many hydrogen
atoms are present in its structure? a) - -) 52
-3. Which of the following properly describes constitutional (structural)
isomers? - -compounds with the same molecular formula, but a different
order of attachment of atoms
-4. How many secondary and tertiary carbons, respectively, are in the
following compound? - -) 2, 3
-5. What is the molecular formula and name of the following compound? - -
C4H9Cl, 2-chlorobutane
-6. What is the IUPAC name of the compound below? - -methylcyclohexane
-which reaction type is most characteristic of alkenes? - -addition
-what is the IUPAC name for the compound below? - -trans- 2, 3- dichlorvos-
2-pentene
-what is the structure and name of the product of the following reaction? - -
ch3ch2ch2ch3, butane
-alkanes and alkenes are no polar compounds and hence have poor
solubility in water - -true
-carbon monoxide may be produced in the incomplete combustions of
methane. - -true
-The names ortho- dimethylbenzene and 1,4- dimethylbenzene represent
the same compound - -false
-if a compound's name ends with " diene", this suggest that is it an alkene
containing two double bonds in its structure - -true
-what is the oxidation of a primary alcohol - -aldehyde
-which of the following alcohol is tertiary alcohol? - -2- methyl- 2- butanol
, -what compound is produced when 2 methyl-3 pentanol is oxidized ? - -2
methyl- 3 pentanone
-what class of compounds is represented by the general formula R-O-R - -
ethers
-which of the following compounds will give a silver mirror finish when
treated with tollens' reagent ? - -butanal
-which is the IUPAC name for the following compounds - -2-chloro, 3-
hexanol
-what is the proper IUPAC name for the three carbon aldehyde - -propanal
-what class of compounds is commonly used as a medical anesthetic - -
ethers
-a phenol is a compound that contains a hydroxyl group attached to a
benzene ring - -true
-by definition oxidation is a process that involves removal of hydrogens - -
true
-The oxidation of a ketoneproduces a carboxylic acid - -true
-14. Small (low molecular weight) aldehydesare generally lesswater-soluble
than large ones - -true
-1. You are given fourdifferentcompounds(A, B, C, and D)that
havecomparable weights:Compound A:etherCompound B:ketoneCompound
C:alcoholCompound D:alkaneD, A, B, C
b) Briefly explain your answer. (1 pt) - -D, A, B, C
The highest b.pamong the four given compound is that of alcohol. Alcohols
are able to hydrogen-bond to each other and hence making the interactions
between them stronger and require higher energy to break apart. On the
other hand, alkanes have the lowest b.p because they have no ability to
hydrogen bond.
-give the IUPAC name of the following compound:(1.5pt) - -
ch3ch2ch2↓chch3
sh
IUPAC name: 2-pentanethiol
-Which of the following statements concerning acids and bases is FALSE? - -
e) Carboxylic acids behave as acids because they can accepta proton (H+)
when they are dissolved in water
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