Chem 120 final exam questions and
answers 2024
What is the correct order of melting points for the following alkanes, from highest to
lowest temperature? - ANS-heptane > hexane > ethane > methane
2. Given an alkane that contains 25 carbon atoms. How many hydrogen atoms are
present in its structure? a) - ANS-) 52
3. Which of the following properly describes constitutional (structural) isomers? -
ANS-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? - ANS-) 2, 3
5. What is the molecular formula and name of the following compound? - ANS-C4H9Cl,
2-chlorobutane
6. What is the IUPAC name of the compound below? - ANS-methylcyclohexane
which reaction type is most characteristic of alkenes? - ANS-addition
what is the IUPAC name for the compound below? - ANS-trans- 2, 3-
dichlorvos-2-pentene
what is the structure and name of the product of the following reaction? -
ANS-ch3ch2ch2ch3, butane
alkanes and alkenes are no polar compounds and hence have poor solubility in water -
ANS-true
carbon monoxide may be produced in the incomplete combustions of methane. -
ANS-true
The names ortho- dimethylbenzene and 1,4- dimethylbenzene represent the same
, compound - ANS-false
if a compound's name ends with " diene", this suggest that is it an alkene containing two
double bonds in its structure - ANS-true
what is the oxidation of a primary alcohol - ANS-aldehyde
which of the following alcohol is tertiary alcohol? - ANS-2- methyl- 2- butanol
what compound is produced when 2 methyl-3 pentanol is oxidized ? - ANS-2 methyl- 3
pentanone
what class of compounds is represented by the general formula R-O-R - ANS-ethers
which of the following compounds will give a silver mirror finish when treated with
tollens' reagent ? - ANS-butanal
which is the IUPAC name for the following compounds - ANS-2-chloro, 3- hexanol
what is the proper IUPAC name for the three carbon aldehyde - ANS-propanal
what class of compounds is commonly used as a medical anesthetic - ANS-ethers
a phenol is a compound that contains a hydroxyl group attached to a benzene ring -
ANS-true
by definition oxidation is a process that involves removal of hydrogens - ANS-true
The oxidation of a ketoneproduces a carboxylic acid - ANS-true
14. Small (low molecular weight) aldehydesare generally lesswater-soluble than large
ones - ANS-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) - ANS-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
answers 2024
What is the correct order of melting points for the following alkanes, from highest to
lowest temperature? - ANS-heptane > hexane > ethane > methane
2. Given an alkane that contains 25 carbon atoms. How many hydrogen atoms are
present in its structure? a) - ANS-) 52
3. Which of the following properly describes constitutional (structural) isomers? -
ANS-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? - ANS-) 2, 3
5. What is the molecular formula and name of the following compound? - ANS-C4H9Cl,
2-chlorobutane
6. What is the IUPAC name of the compound below? - ANS-methylcyclohexane
which reaction type is most characteristic of alkenes? - ANS-addition
what is the IUPAC name for the compound below? - ANS-trans- 2, 3-
dichlorvos-2-pentene
what is the structure and name of the product of the following reaction? -
ANS-ch3ch2ch2ch3, butane
alkanes and alkenes are no polar compounds and hence have poor solubility in water -
ANS-true
carbon monoxide may be produced in the incomplete combustions of methane. -
ANS-true
The names ortho- dimethylbenzene and 1,4- dimethylbenzene represent the same
, compound - ANS-false
if a compound's name ends with " diene", this suggest that is it an alkene containing two
double bonds in its structure - ANS-true
what is the oxidation of a primary alcohol - ANS-aldehyde
which of the following alcohol is tertiary alcohol? - ANS-2- methyl- 2- butanol
what compound is produced when 2 methyl-3 pentanol is oxidized ? - ANS-2 methyl- 3
pentanone
what class of compounds is represented by the general formula R-O-R - ANS-ethers
which of the following compounds will give a silver mirror finish when treated with
tollens' reagent ? - ANS-butanal
which is the IUPAC name for the following compounds - ANS-2-chloro, 3- hexanol
what is the proper IUPAC name for the three carbon aldehyde - ANS-propanal
what class of compounds is commonly used as a medical anesthetic - ANS-ethers
a phenol is a compound that contains a hydroxyl group attached to a benzene ring -
ANS-true
by definition oxidation is a process that involves removal of hydrogens - ANS-true
The oxidation of a ketoneproduces a carboxylic acid - ANS-true
14. Small (low molecular weight) aldehydesare generally lesswater-soluble than large
ones - ANS-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) - ANS-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
