Aldehydes Ketones and Carboxylic Acids Test

Result

Aldehydes Ketones and Carboxylic Acids Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

Benzene gets converted to benzaldehyde by Gatterman – Koch reaction. The appropriate reagent for the conversion is

A
Chromic oxide

B
Chlorine

C
Chromyl chloride

D
Carbon monoxide and hydrogen chloride

Solution

Gatterman Koch is a kind of Friedal craft acylation done in presence of CO and HCl using AlCl₃ as a catalyst and are used to produce aromatic aldehydes.
C₆H₆ + CO + HCl → C₆H₅CHO
Question 2
1 / -0

Arrange the following sets of compounds in order of their increasing boiling points : Pentan – 1 – ol, butan – 1 – ol, butan – 2 – ol, ethanol, propan – 1 – ol, methanol

A
Methanol, ethanol, propan – 1 – ol, butan – 2 – ol, butan – 1 – ol, pentan – 1 – ol.

B
Propan – 1 – ol, butan – 2 – ol, butan – 1 – ol, pentan – 1 – ol, methanol, ethanol

C
Pentan – 1 – ol Methanol, ethanol, propan – 1 – ol, butan – 2 – ol, butan – 1 – ol

D
Butan – 2 – ol, butan – 1 – ol, pentan – 1 – ol, methanol, ethanol, propan – 1 – ol

Solution

Boiling point is α Vanderwall forces α Molecular weight.

When the molecular weight is same like in case of butan-1-ol and butan -2- ol, then boiling point increases as branching decreases. because with increase in branching, molecule occupies a spherical shape and surface are of contact decreases and hence boiling point decreases.

So, butan-2-ol will have lower boiling point than butan-1-ol.
Question 3
1 / -0

Arrange the following alcohols, hydrocarbon and ether in order of their increasing boiling points Pentan – 1 – ol, n – butane, pentanal, ethoxyethane.

A
pentanal and pentan – 1 – ol, n – Butane, ethoxyethane

B
ethoxyethane, pentanal and pentan – 1 – ol, n – Butane

C
pentan – 1 – ol , n – Butane, ethoxyethane, pentanal

D
n – Butane, ethoxyethane, pentanal and pentan – 1 – ol

Solution

Alcohols are involved in hydrogen bonding with each other i .e. intermolecular hydrogen bonding and thus have a higher boiling point compared to aldehydes or ketones and ethers.
Aldehydes and ketones due to their polar CO bond have higher boiling point compared to ethers.
Alkanes being non-polar have the least boiling point.