Practice Test 18
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DIRECTION : These are Assertion-Reason type question. Question contains two statements:Statement-1 (Assertion) and Statement-2 (Reason). Answer these question from the following four options.

Statement-1 :Different number of electron pairs are present in resonance structures.
Statement-2 :Resonance structures differ in the location of electrons around the constituent atoms.

  • Solution

    Resonance structures contain the same number of unpaired electrons. However, they differ in the way of distribution of electrons.

DIRECTION : These are Assertion-Reason type question. Question contains two statements:Statement-1 (Assertion) and Statement-2 (Reason). Answer these question from the following four options.

Statement-1 :Trans-2-butene on reaction with Br2 gives meso-2, 3-dibromobutane.
Statement-2 :The reaction involves syn-addition of bromine.

  • Solution

    The assertion that trans-2 butene reacts with Br2 to product meso-2, 3-dibromobutane is correct but it does not involve syn-addition of Br2

DIRECTION : These are Assertion-Reason type question. Question contains two statements:Statement-1 (Assertion) and Statement-2 (Reason). Answer these question from the following four options.

Statement-1:Aniline is better nucleophile than anilium ion.
Statement-2 :Anilium ion have +vecharge

  • Solution

    It is fact that aniline is better nucleophile than aniliumion. Anilium ion contain +ve charge, which reduces the tendency to donate lone pair of electron \(C_{6}H_{5}NH_{3}\) .Therefore , both assertion and reason are true

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

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In allene (C3H4), the type(s) of hybridisation of the carbon atoms is (are)

  • Solution

    Allene (C3H4) is \(H_{2}\overset{Sp^{2}}{C} = \overset{Sp}{C} = \overset{Sp^{2}}{C}H_{2}\)

Among the following compounds, the most acidic is

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Organic Chemistry : Some Basic Principles And Techniques
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