Important Questions of Hydrocarbons Chemistry | Zigya

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321.

The octane number of a sample of petrol is 40 .It means that its knocking property is equal to the mixture of :

  • 40% n-heptane + 60% iso-octane

  • 40% petrol + 60% iso-octane

  • 60% n-heptane + 40% iso-octane

  • 60% petrol + 40% iso-octane


322.

The main component of marshgas is :

  • methane

  • ethane

  • butane

  • isobutane


323.

Assertion: The presence ofnitro group facilitates nucleophilic substitution reactions in aryl halides.

Reason: The intermediate carbanion is stabilised due to the presence of nitro group.

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

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

  • If assertion is true, but reason is false.

  • Both assertion and reason are false statements.


324.

Assertion : Addition of HBr on 2-butene gives two isomeric products.

Reason: Addition of HBr on 2-butene follows Markovnikov's rule.

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

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

  • If assertion is true, but reason is false.

  • Both assertion and reason are false statements.


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325.

Assertion : p-O2N- C6H5COCH3 is prepared by Friedel Crafts acylation of nitrobenzcne.

Reason : Nitrobenzene easily undergoes electrophilic substitution reaction.

  • 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.


326.

Assertion : Alkyl isocyanides in acidified water give alkyl formamides.

Reason : In isocyanides, carbon first acts as a nucleophile and then as an electrophile.

  • 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.


327.

Assertion : Cyclopentadienyl anion is much more stable than allyl anion.

Reason : Cyclopentadienyl anion is aromatic in character.

  • 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.


328.

Action of acetylene on dilute H2SO4 gives :

  • acetic acid

  • acetaldehyde

  • acetone

  • acetoacetic ester


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329.

The treatment of benzene with isobutene in the presence of sulphuric acid gives

  • iso -butyl benzene

  • tert -butyl benzene

  • n -butyl benzene

  • no reaction


330.

The strongest base among the following is


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