Aldehydes Ketones and Carboxylic Acids Test

Result

Aldehydes Ketones and Carboxylic Acids Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

IUPAC name of CH₃CHO is

A
Ethanal

B
Acetaldehyde

C
Formaldehyde

D
None of these

Solution

CH₃CHO is ethanal as we have two carbons in main chain so, the word root is 'Eth' and the functional group is aldehydic group so, suffix is 'al'. Hence, IUPAC name will be Ethanal.
Question 2
1 / -0

CH₃CH(OCH₃)CHO is called

A
Methoxypropionaldehyde

B
alpha Methoxypropionaldehyde and 2 – Methoxypropanal

C
2 – Methoxypropanal

D
None of these

Solution

This is alpha Methoxypropionaldehyde( common name) and 2 – Methoxypropanal (IUPAC name)
Question 3
1 / -0

The carbonyl carbon atom

A
forms a π – bond with oxygen

B
sp² – hybridised

C
forms three sigma (σ) bonds

D
All of these

Solution

R₁R₂C=O is carbonyl so 3 sigma bond . two sigma bond with C chain attached (R1 and R2) and one sigma bond with the oxygen atom. and it also form1 pie bond with oxygen.

hybridisation of carbony carbon = sp² as it forms total 3 sigma bond and has zero lone pair.

if number of sigma bond + lonepair =3 then hybridisation is sp²
Question 4
1 / -0

Ozonolysis of alkenes followed by reaction with zinc dust and water gives depending on the substitution pattern of the alkene

A
aldehyde

B
a mixture of both aldehyde and ketone

C
any of these

D
ketone

Solution

Reductive ozonolysis yields aldehyde or ketone depending on the nature of alkene.

for example: CH₂=CH₂ on reaction with O₃/Zn will give 2 molecule of HCHO

while CH₃C(CH₃)=CHCH₃ on the reaction with O₃/Zn will give one molecule of propanone and one molecule of acetaldehyde

and CH₃C(CH₃)=C(CH₃)CH₃ on reaction with O₃/Zn will give 2 molecule of propanone.