CHEM 30B MIDTERM STUDY QUESTIONS
WITH ANSWERS PROVIDED. 2024/2025
UPDATE
1) A hemiacetal contains an OR group and a C=O bonded to
the same carbon.: false
2) An acetal is a compound with two OR groups bonded to the
same carbon.: true
3) An ether has a general structure ROR.: true
4) Acetals are ethers.: true
5) Cyclic hemiacetals are converted to acetals by reaction with
an alcohol.-
: false
6) The carbon located adjacent to the -COOH in a carboxylic
acid is classified as the alpha carbon: true
Carboxylic acids have lower boiling points and melting points
than esters with similar molecular weights because of their
ability to create hydrogen bonds between molecules.: false
A hemiacetal is a compound that contains a hydroxyl group (-
0H) and an alkoxy group (OR) on adjacent carbon atoms: false
10)Which of the following represents the general condensed
formula for an aldehyde?: RCHO
Both aldehydes and ketones contain a carbonyl functional
group. Which other class of compounds also contains a
carbonyl functional group? : carboxylic acid
11. The C=O bond of the carbonyl functional group is
(polar/nonpolar), and the carbon of the carbonyl has a
molecular shape that is with bond angles of . polar;
trigonal planar 120
12. 24)Which compound has the highest boiling point?:
CH3(CH2)4CH20H
1/4
WITH ANSWERS PROVIDED. 2024/2025
UPDATE
1) A hemiacetal contains an OR group and a C=O bonded to
the same carbon.: false
2) An acetal is a compound with two OR groups bonded to the
same carbon.: true
3) An ether has a general structure ROR.: true
4) Acetals are ethers.: true
5) Cyclic hemiacetals are converted to acetals by reaction with
an alcohol.-
: false
6) The carbon located adjacent to the -COOH in a carboxylic
acid is classified as the alpha carbon: true
Carboxylic acids have lower boiling points and melting points
than esters with similar molecular weights because of their
ability to create hydrogen bonds between molecules.: false
A hemiacetal is a compound that contains a hydroxyl group (-
0H) and an alkoxy group (OR) on adjacent carbon atoms: false
10)Which of the following represents the general condensed
formula for an aldehyde?: RCHO
Both aldehydes and ketones contain a carbonyl functional
group. Which other class of compounds also contains a
carbonyl functional group? : carboxylic acid
11. The C=O bond of the carbonyl functional group is
(polar/nonpolar), and the carbon of the carbonyl has a
molecular shape that is with bond angles of . polar;
trigonal planar 120
12. 24)Which compound has the highest boiling point?:
CH3(CH2)4CH20H
1/4
