Search & Filtering
What substances exist primarily in only one state?
37. Which of the following statements is INCORRECT?
(1) The bond angles involving the carbonyl group are approximately 120 O in ketones
(2) The resonance description of the polar carbonyl group is represented as follows: C O C O 30
(3) The ketone carbonyl group is more stable and less reactive towards nucleophiles than the aldehyde carbonyl group because the carbonyl carbon atom of a ketone bears two electron donating groups.
(4) Aldehydes and ketones undergo nucleophilic addition reactions to the carbonyl group, with the nucleophilic attack on the planar, uncrowded carbon atom and the electrophilic attack on the partially negative and weakly basic oxygen atom
36. Which of the following statements is INCORRECT?
(1) Propanal has a lower boiling point than propanol because propanol is more polar and the dipole-dipole attractive forces between the molecules are stronger.
(2) Propanone is soluble in water because the carbonyl oxygen atom of propanone can form hydrogen bonds with the protons of the water molecule.
(3) Butan-2-one has a lower boiling point than propan-2-one because of the larger alkyl groups bonded to the carbonyl carbon atom increases the degree of bonding between molecules.
(4) Acetone is more soluble in water than butan-2-one because the larger alkyl groups bonded to the carbonyl carbon atom reduces the extent of intermolecular hydrogen bonding with the protons of the water molecule.
Identify the major product formed in the reaction below:
3-Hexyne + excess hydrogen + Pt catalyst →
Which of the alkyne addition reactions below involve(s) an enol intermediate?
(1) hydroboration/oxidation
(2) hydrogenation in the presence of a metal catalyst
(3) halogenation
(4) none of the above
Which of the following reactions will take place as shown?
(1)
CH3 C C CH2CH3 + Na / NH3 C C
H
H CH2CH3
CH3
(2)
CH3 C C CH2CH3 + Na / NH3 CH3CH2CH2CH2CH3
(3)
CH3C CH + HBr CH CH CH Br 3
(4)
CH3C CH + HBr (excess) CH3 CH
Br
CH2Br
Which of the following reactions will NOT produce the MAJOR organic product as shown?
(1)
CH3 C
CH3
CH3
C CH
NaNH2
NH3
CH3Br
CH3 C C
CH3
CH3
C CH3
(2)
CH3 C
CH3
CH3
C CH
NaOH
H2O
CH3Br
CH3 C C
CH3
CH3
C CH3
(3)
H C C H
(i) NaNH2
/NH3
(ii)CH3CH2Br
(i) NaNH2
/NH3
(ii)CH3Br
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(4)
H C C H
NaNH2
NH3
CH3 C
CH3
CH3
Br
CH2 C
CH3
CH3
(1) Acetylene is a stronger acid than ethylene since the conjugate base of acetylene is
more stable than the conjugate base of ethylene
(2) Terminal alkynes are strong acids since ionization gives an acetylide ion in which
the unshared electron pair occupied an orbital with 50% s-character.
(3) The acetylide ion is a carbanion, an anion in which the negative charge is borne by
the carbon atom
(4) The amide ion is a weaker base than the acetylide ion and cannot convert
acetylene to its conjugate base in quantitative yields
a. You are the owner of a company that produces banana oil (isoamyl acetate) in large quantities. Determine which reactant is more cost effective to use in excess given the following information:
