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 Multiple Choice QuestionsMultiple Choice Questions

1.

A solution of (–) –1 – chloro –1 – phenylethane is toluene racemises slowly in the presence of a small amount of SbCl5, due to the formation of

  • carbanion

  • Carbene

  • Carbocation

  • free radical


C.

Carbocation


Because of the planar structure of carbonation, both retention and inversion can take place.
709 Views

2.

Which of the following on heating with aqueous KOH, produces acetaldehyde?

  • CH3COCl

  • CH3CH2Cl

  • CH2Cl CH2Cl

  • CH3CH2Cl  


D.

CH3CH2Cl  

217 Views

3.

Iodoform can be prepared from all except

  • ethyl methyl ketone

  • isopropyl alcohol

  • 3-methyl-2-butanone

  • Isobutyl alcohol


D.

Isobutyl alcohol

Iodoform is given by
1) methyl ketones R-CO-CH3
2) alcohols of the type R-CH(OH)CH3
where R can be hydrogen also



340 Views

4.

Arrange the following compounds in order of decreasing acidity

  • II>IV>I>III

  • I>II>III>IV

  • III>I>II>IV

  • IV>III>I>II


C.

III>I>II>IV

Electron withdrawing group increases the acidic strength of the compounds by destabilising and stabilising the phenoxide ion formed respectively.

The presence of an electron withdrawing group increases the acidic strength by stabilising the phenoxide ion. On other hands, the presence of electron releasing group destabilises the phenoxide ion and decrease the acidic strength.

NO2>Cl>CH3>OCH3

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5.

The main product of the following reaction is

straight C subscript 6 straight H subscript 5 CH subscript 2 CH left parenthesis OH right parenthesis CH left parenthesis CH subscript 3 right parenthesis subscript 2 space rightwards arrow with Conc. space straight H subscript 2 SO subscript 4 on top space ?


A.

216 Views

6.

Which of the following reagents may be used to distinguish between phenol and benzoic acid ?

  • Aqueous NaOH

  • Tollen's reagent

  • Molisch reagent

  • Neutral FeCl3


D.

Neutral FeCl3

221 Views

7.

Phenol is heated with a solution of a mixture of KBr and KBrO3.The major product obtained in the above reaction is

  • 2-Bromophenol

  • 3-Bromophenol

  • 4-Bromophenol

  • 2, 4, 6 -Tribromophenol


D.

2, 4, 6 -Tribromophenol

KBr (aq.) + KBrO3 (aq.) → Br2(aq.)

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8.

Select the ether among following that yields methanol as one the products on reaction with cold hydroiodic acid

  • 1-methoxybutane

  • 1-methoxybutane-2-methylpropane

  • 2-methoxy-2-methylpropane

  • methoxybenzene


C.

2-methoxy-2-methylpropane

According Zeise! method, when an ether reacts with cold HI, alkyl iodide and alcohol are formed. In case of asymmetrical ether, the alkyl halide is always formed from the smaller alkyl group provided no tertiary (3°) alkyl group is present and if any 3° alkyl group is present, the halogen gets attached with it. In case of alkyl aryl ethers, the products are always phenol and an alkyl halide.


9.

The major product obtained on the interaction of phenol with sodium hydroxide and carbon dioxide is

  • Benzoic acid

  • Salicylaldehyde

  • Salicylic acid

  • Phthalic acid


C.

Salicylic acid

Kolbe – Schmidt reaction is

368 Views

10.

From amongst the following alcohols the one that would react fastest with conc. HCl and anhydrous ZnCl2, is

  • 1-Butanol

  • 2-Butanol

  • 2-Methylpropan-2-ol

  • 2-Methylpropanol


C.

2-Methylpropan-2-ol

Formation of tertiary butyl carbocation is the most rapid compared to other lesser stable ones with Lucas reagent.

319 Views