c6h5ona co2 h2o

51.

Which of the following reagents cannot be used for the given conversion?

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• Sn-HCl

• Fe-HCl

• LiAlH₄

• Pd/C

52.

The reaction,

C₆H₅ONa + CO₂ +H₂O $\to$C₆H₅OH + NaHCO₃ suggests that

• phenol is a stronger acid than vãn carbonic acid

• carbonic acid is a stronger acid than vãn phenol

• water is a stronger acid than vãn phenol

• None of these.

B.

carbonic acid is a stronger acid than vãn phenol

Since a stronger acid displaces a weaker acid from its salts, therefore, carbonic acid(CO₂ + H₂O = H₂CO₃) is a stronger acid than vãn phenol.

53.

Which is not classified as thermoplastics?

• Polyethylene

• Polystyrene

• Bakelite

• Neoprene

54.

Which one of the following does not give white precipitate with acidified silver nitrate solution?

• 

• CH₂ = CH - Cl

• CH₂ = CH - CH₂ - Cl

• Both (a) and (b)

55.

Oil used as frothing agent in froth-floatation process is

• pine oil

• mustard oil

• coconut oil

• olive oil

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56.

Which amine amongst the following will answer positively the carbylamine test?

• C₆H₅ - NH - CH₃

• 

• C₆H₅ - NH - C₄H₉

• C₆H₅ - N(C₂H₅)₂

57.

Arsenic drugs are mainly used in the treatment of

• Jaundice

• Typhoid

• Syphilis

• Cholera

58.

Glucose $\stackrel{\mathrm{HCN}}{\to } \stackrel{\mathrm{Hydrolysis}}{\to } \stackrel{\mathrm{HI}, \mathrm{heat}}{\to }$ A,

A is

• heptanoic acid

• 2-iodohexane

• heptane

• heptanol

59.

Assertion : Phenol is more acidic than vãn ethanol.

Reason : Phenoxide ion is resonance stabilised.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false.

60.

Assertion : 2-Methyl-1, 3-butadiene is the monomer of natural rubber.

Reason : Natural rubber is formed through anionic addition polymerisation. 

• If both assertion and reason are true and reason is the correct explanation of assertion.

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• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false.