Aldehydes, Ketones And Carboxylic Acids

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Question
CBSEENCH12010611

2-chloro-2-methylpentane on reaction with sodium methoxide in methanol yields:

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  • Both a and c

  • Only c

  • Both a and b

  • All of these

Solution

D.

All of these

Strong nucleophile  left parenthesis straight O with minus on top Me right parenthesis polar solvent (MeOH) gives elimination products Products over substitution products but all products are possible in different yields.
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Question
CBSEENCH12010853

Among the following the one that gives positive iodoform test upon reaction with I2 and NaOH is 

  • CH3CH2CH(OH)CH2CH3

  • C6H5CH2CH2OH

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  • PhCHOHCH3

Solution

D.

PhCHOHCH3

Question
CBSEENCH12010686

Compound (A), C8H9Br, gives a white precipitate when warmed with alcoholic AgNO3. Oxidation of (A) gives a acid (B), C8H6O4. (B) easily forms anhydride on heating. Identify the compound (A)

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Solution

D.

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Question
CBSEENCH12010789

In Cannizzaro reaction given below   2 Ph space CHO space rightwards arrow with colon OH with left parenthesis negative right parenthesis on top on top space PhCH subscript 2 OH space plus space PhC straight O with.. on top subscript 2 superscript left parenthesis negative right parenthesis end superscript spacethe slowest step is

  • The attack of colon straight O with minus on top straight H at the carboxyl group

  • The transfer of hydride to the carbonyl group

  • The abstraction of proton from the carboxylic group

  • The deprotonation of PhCH2OH

Solution

B.

The transfer of hydride to the carbonyl group

Hydride transfer is the slowest step.
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Question
CBSEENCH12010644

In the following sequence of reaction,
Toluene space rightwards arrow with KMnO subscript 4 on top space straight A space rightwards arrow with SOCl subscript 2 on top straight B space rightwards arrow from BaSO subscript 4 to straight H subscript 2 divided by Pd of straight C
The Product C is

  • C6H5COOH

  • C6H5CH3

  • C6H5CH2OH

  • C6H5CHO

Solution

D.

C6H5CHO

Toluene undergoes oxidation with KMnO4, forms benzoic acid. In this conversation, alkyl part of toluene converts into the carboxylic group. Further, the benzoic acid reacts with thionyl chloride (SOCl2) to give benzoyl chloride which upon reduction wth H2/Pd or BaSO4 forms benzaldehyde (Rosenmund reduction).
The reactions are

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