Which of the following will show aromatic behaviour ? from

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 Multiple Choice QuestionsMultiple Choice Questions

291.

The end product in the sequence would be 

C3H7OH 170°H2SO4 A Br2 B KOHAlc. C

  • CH3-CCH

  • CH3-C(OH)=CH2

  • CH2=C=CH2

  • CH3-CH(OH)-CH2(OH)


292.

Assertion: Ortho and para-nitrophenol can be separated by steam distillation.

Reason: Para-nitrophenol is steam volatile due to intramolecular hydrogen bonding.

  • 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.


293.

The function of anhydrous AlCl3 in the Friedel-Craft's reaction is to :

  • absorb water

  • absorb HCl

  • to produce electrophile

  • to produce nucleophile


294.

When two double bonds are present on adjacent carbon atoms , the diene is called as :

  • conjugated diene

  • cumulative diene

  • isolated diene

  • None of these


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295.

Lindlar's catalyst/H2RCCR Na/NH3 A ,

A and B are geometrical isomers (RCH=CHR)

  • A is cis , B is trans

  • A is trans , B is cis

  • A and B both are cis

  • A and B both are trans


296.

The homologue of ethyne is :

  • C2H4

  • C3H6

  • C3H3

  • C3H4


297.

Which of the following is a chiral compound?

  • Hexane

  • n-Butane

  • Methane

  • 2,3,4-Trimethylhexane.


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298.

Which of the following will show aromatic behaviour ?

  • None of these


B.

Aromatic compounds exhibits following properties :

(i) They obey Huckel (4n + 2) πe- rule .

(ii) They involve delocalisation of π-electrons .

(iii) Molecule must be planar (ie , sp2 hybridised) .

 Benzene satisfy all these conditions , so it will be aromatic in nature .


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299.

When trans-2-butene is reacted with Br2 then product formed is

  • Meso compounds

  • both (b) and (c)


300.

Assertion : Phenol is more reactive than benzene towards electrophilic substitution reaction.

Reason : In the case of phenol, the intermediate carbocation is more 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.


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