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Hydrocarbons Te...

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  • Question 1
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    Intermediate in hydration of alkene is

  • Question 2
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    Directions For Questions

    Hydrogenation of alkenes and alkynes takes place in presence of certain catalysts. In Sabatier Senderen's reaction, the addition of hydrogen takes place in the presence of Raney nickel catalyst. Platinum and palladium can also be used as a catalyst in these reactions. These are the heterogeneous catalyst and used in a finely divided state. Experimentally, it is observed that less crowded alkenes adsorb $$H_{2}$$ at a faster rate. Controlled hydrogenation of alkyne in the presence of Lindlar's catalyst yields cis product i.e., 'cis' alkene. Thus, in the presence of Lindlar's catalyst, 'syn' addition takes place. The relative rate of hydrogenation follows the order:
    $$-C \equiv C - >\ \  >C= C<\ \  > \ \ > C = O > C_{6}H_{6}$$
    Non-terminal alkynes a reduced in presence of $$Na$$ or $$Li$$ metal dissolved in liquid ammonia. In this reaction, the anti-addiction of hydrogen results in the trans-product.
    Answer the following questions:

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    The relative rate of catalytic hydrogenation of following alkenes is

  • Question 3
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    In the given reaction,
    $$CH_{3} - CH\equiv C - CH_{3} \xrightarrow {Na/NH_{3}(liq.)}X$$
    Compound $$(X)$$ will be

  • Question 4
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    Match List - I with List-II and select the correct answer from the codes given below the lists:

    List I
    Reaction    		List II
    Product
    A.$$CH_{3}CH = CH_{2} \underset {(ii)HCOOH}{\xrightarrow {(i) BH_{3}-THF}}$$1.$$n-propylamine$$
    B.$$CH_{3}CH = CH_{2} \xrightarrow {(ii) AgNO_{3}}{\xrightarrow {(i) BH_{3} - THF}}$$2.$$n-propylbromide$$
    C.$$CH_{3}CH = CH_{2} \underset {(ii) Br_{2}}{\xrightarrow {(i) BH_{3} - THF}}$$3.$$n-hexane$$
    D.$$CH_{3}CH = CH_{2} \underset {(ii) Br_{2}}{\xrightarrow {(i) BH_{3} - THF}}$$4.$$n-propane$$

  • Question 5
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    The compound prepared by a substitution reaction of benzene is:

  • Question 6
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    Disubstituted derivatives of benzene are of ________ type/ types.

  • Question 7
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    The number of $$\pi-electrons$$ in benzene molecule are:

  • Question 8
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    Benzene gives mainly:

  • Question 9
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    The ring structure of benzene was first proposed by:

  • Question 10
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    The most appropriate major product of the above sequence of reaction would be:

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