Aldehydes Ketones and Carboxylic Acids Test

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Aldehydes Ketones and Carboxylic Acids Test - 6

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Weekly Quiz Competition

Question 1
1 / -0

One mole of a symmetrical alkane on ozonolysis gives two moles of an aldehyde having molecular mass of 44u. The alkene is

A
1 – butene

B
2 – butene

C
Ethene

D
Propene

Solution

2-butene on reductive ozonolysis with O₃/Zn will give CH₃CHO which has molecular mass of 44u.

CH₃CH = CHCH₃ + O₃/Zn → 2CH₃CHO

Molecular mass of CH₃CHO = 12+3+12+1+16 = 44u
Question 2
1 / -0

Ketones are reduced to the corresponding alcohols by catalytic hydrogenation to form

A
primary alcohols

B
secondary alcohols

C
tertiary alcohols

D
None of these

Solution

Aldehydes on catalytic hydrogenation using H₂/Pt give primary alcohols while ketones on catalytic hydrogenation using H₂/Pt give secondary alcohols.
Question 3
1 / -0

Which of the following is correct?

A
Sucrose on reaction with NaCl give invert sugar

B
Reaction of vegetable oil with H₂SO₄ gives glycerine

C
Any aldehyde gives secondary alcohol on reductionc

D
C₂H₅OH, iodine with NaOH gives iodoform

Solution

I₂ in presence of NaOH act as a weak oxidising agent and thus C₂H₅OH get oxidizes to CH₃CHO. and –COCH₃ group is important for iodoform .

CH₃CHO + I₂ + OH^- → CHI₃ + HCOO^-

CHI₃ is a yellow ppt known as iodoform
Question 4
1 / -0

A mixture of benzaldehyde and formaldehyde on heating with aqueous NaOH solution gives

A
benzyl alcohol and methyl alcohol

B
benzyl alcohol and sodium formate

C
sodium benzoate and sodium formate

D
sodium benzoate and methyl alcohol

Solution

They will undergo cannizaro reaction as neither benzaldehyde nor formaldehyde has alpha hydrogen.

HCHO will be more reactive towards cannizaro compared to benzaldehyde because of less steric hinderance.

So, OH^- nucleophile will attck on HCHO first and then hydride shift from HCHO to benzaldehyde will occur. and thus HCHO will oxidise to HCOO^- ion and benzaldehyde will reduce to benzylalcohol.
Question 5
1 / -0

Clemmensen reduction of a ketone is carried out in the presence of which of the following?

A
LiAlH₄

B
H₂ and Pt as catalyst

C
Glycol with KOH

D
Zn – Hg with HCl

Solution

For Clemmenson we use Zn-Hg( conc HCl ). This reduction reduces carbonyl groups to alkane. this reduction cannot be used when an acid sensitive group is present.

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Aldehydes Ketones and Carboxylic Acids Test - 6

Result

Aldehydes Ketones and Carboxylic Acids Test - 6

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SHARING IS CARING

Question 1

1 – butene

2 – butene

Ethene

Propene

Solution

Question 2

primary alcohols

secondary alcohols

tertiary alcohols

None of these

Solution

Question 3

Sucrose on reaction with NaCl give invert sugar

Reaction of vegetable oil with H2SO4 gives glycerine

Any aldehyde gives secondary alcohol on reductionc

C2H5OH, iodine with NaOH gives iodoform

Solution

Question 4

benzyl alcohol and methyl alcohol

benzyl alcohol and sodium formate

sodium benzoate and sodium formate

sodium benzoate and methyl alcohol

Solution

Question 5

LiAlH4

H2 and Pt as catalyst

Glycol with KOH

Zn – Hg with HCl

Solution

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Reaction of vegetable oil with H₂SO₄ gives glycerine

C₂H₅OH, iodine with NaOH gives iodoform

LiAlH₄

H₂ and Pt as catalyst