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Hydrocarbons Test - 11

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Hydrocarbons Test - 11
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Name the IUPAC nomenclature of CH3CH2CH2CH=CH2CH_3-CH_2-CH_2-CH=CH_2
    Solution
    Chain of five carbons with double bond on 1,2 carbons, 1- pentene .
  • Question 2
    1 / -0
    Molecular mass of Benzene is _______.
    Solution
    Benzene is C6H6C_6H_6.
    So molecular mass= 12×6+1×6=7812\times 6 + 1\times 6 = 78
  • Question 3
    1 / -0
    Sodium acetate can be converted to ethane by which of the following method?
    Solution
                                                                  
      2CH3COONa++2H2OCH3CH3+2CO2+H2+2NaOH2CH_3COO-Na+ + 2H_2O\rightarrow CH_3CH_3+ 2CO_2+ H_2+2NaOH

    This reaction is called Kolbe's electrolysis.

    Option B is correct.
  • Question 4
    1 / -0
    Which one of the following is reduced with ZnHgZn-Hg and HClHCl to give alkane ?
    Solution

  • Question 5
    1 / -0
    2.84 gms of methyl iodide was completely converted into CH3MgICH_{3} MgI and the product was decomposed by the excess of ethanol. The volume of the gaseous hydrocarbon produced at NTP will be_________.
    Solution
    In this reaction, one mole of Grignard reagent reacts with one mole of alcohol to produce hydrocarbon.

     CH3ICH3MgI+C2H5OHCH4+C2H5OMgICH_3I \rightarrow CH_3MgI +C_2H_5OH\rightarrow CH_4 + C_2H_5OMgI

    Mass of methyl iodide = 2.84 gm (given)
    No. of mole of methyl iodide = 2.84/142 =0.02

    So hydrocarbon produced = 0.02 mole

    So the volume of produced hydrocarbon = 0.448 lit
    (one mole produced 22.4 lit).

    Option C is correct.
  • Question 6
    1 / -0
    The structure of 1,3-dicyclohexyl propane is:
    Solution
    1,3-dicyclohexyl propane contains 2 cyclohexyl ring attached with propane molecule at carbon no. 1 & 3. So option B is correct.
  • Question 7
    1 / -0
    H2C=CH2+H2Ni/3000CC2H6H_{2}C=CH_{2}+H_{2}\xrightarrow[]{Ni/300^{0}C}C_{2}H_{6} to get back the ethene, ethane must be:
    Solution
    Alkanes formed from alkenes, can be reverted back to alkenes by catalytic cracking or thermal decomposition, when heated in the absence of air, gives a mixture of ethylene and hydrogen.
    Cleavage of C-H bonds: This type of fission results in the formation of alkenes. It is catalyzed by the oxides of chromium, vanadium, molybdenum.
  • Question 8
    1 / -0
    On halogenation, an alkane (C5H12C_{5} H_{12} ) gives only one mono halogenated product. The alkane is:
    Solution

  • Question 9
    1 / -0
    Which of the following compounds will form a hydrocarbon on reaction with a Grignard reagent?
    Solution
    A Grignard reagent reacts with compounds containing active H atom, such as water, ammonia, amines, alcohols,  alkynes etc., to form a hydrocarbon. 

    It does not form hydrocarbon with ethanal and propanone.

    RMgX+ROHRH+MgXORRMgX +R'O-H \rightarrow R-H +MgXOR'

    Option A is correct.
  • Question 10
    1 / -0
    The compound obtained by the reaction of methanol and CH3MgXCH_{3} MgX is :
    Solution
    CH3MgXCH_3MgX is the grignard reagent.
    Grignard reagent first of all reacts with the active hydrogen if it is present on the reactant after that it further goes for the substitution reaction.
    Active hydrogen is the hydrogen which is attached with high electronegative elements like oxygen, nitrogen, chlorine.
    For the given reaction: 
    CH3MgXCH_3MgX + CH3OHCH_3OH \to CH4CH_4 + CH3OMgXCH_3OMgX
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