Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

51.

The reaction,

C6H5ONa + CO2 +H2C6H5OH + NaHCO3 suggests that

  • phenol is a stronger acid than carbonic acid

  • carbonic acid is a stronger acid than phenol

  • water is a stronger acid than phenol

  • None of these.


B.

carbonic acid is a stronger acid than phenol

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


52.

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.

  • 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.


C.

If assertion is true but reason is false

Natural rubber is formed through cationic addition polymerisation.


53.

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)


D.

Both (a) and (b)

Both options (a) and (b) will not give white precipitate with acidified silver nitrate solution. It is because chlorine is attached to sp2 hybridized C-atom and there is double bond character between C-Cl bond due to resonance, i.e. C-Cl bond is stronger and it cannot be easily replaced.


54.

Glucose HCN Hydrolysis HI, heat A,

A is

  • heptanoic acid

  • 2-iodohexane

  • heptane

  • heptanol


A.

heptanoic acid

In the above reaction A is heptanoic acid. 


55.

Which is not classified as thermoplastics?

  • Polyethylene

  • Polystyrene

  • Bakelite

  • Neoprene


C.

Bakelite

Bakelite is the first plastic made from synthetic components. It is a thermosetting phenol formaldehyde resin, formed from a condensation reaction of phenol with formaldehyde.


56.

Assertion : Phenol is more acidic than 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.


A.

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

Due to stabilised resonance of phenoxide ion, phenol is more acidic than ethanol.


57.

Arsenic drugs are mainly used in the treatment of

  • Jaundice

  • Typhoid

  • Syphilis

  • Cholera


C.

Syphilis

Arsenic drugs such as salvarsan is used for treatment of syphilis.


58.

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

  • Sn-HCl

  • Fe-HCl

  • LiAlH4

  • Pd/C


C.

LiAlH4

With LiAlH4 nitroarenes give azo  compounds.

2C6H5NO2 LiAlH4 C6H5 - N = N - C6H5


59.

Oil used as frothing agent in froth-floatation process is

  • pine oil

  • mustard oil

  • coconut oil

  • olive oil


A.

pine oil

Pine oil is the oil which is used as a frothing agent in froth floatation .


60.

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

  • C6H5 - NH - CH3

  • C6H5 - NH - C4H9

  • C6H5 - N(C2H5)2


B.

Only aliphatic and aromatic 1° amines give positive carbylamine test.