4-nitrotoluene is treated with bromine to get compound 'P' which

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 Multiple Choice QuestionsMultiple Choice Questions

71.

Which of the following compound will give positive iodoform test?

  • Isopropyl alcohol

  • Propionaldehyde

  • Ethylphenyl ketone

  • Benzyl alcohol


72.

The conversion of ethyl bromide using sodium iodide and dry acetone, this reaction is known as

  • Swarts reaction

  • Finkelstein reaction

  • Sandmeyer reaction

  • Stephen reaction


73.

X and Y in the below reaction are .... and .... respectively

C6H5 - CO2H + X heat C6H5 - COCl QuinolineH2, Pd / BaSO4

  • SOCl2 and C6H5CHO

  • (COCl)2 and C6H5CH3

  • SOCl2 and C6H5CH3

  • (COCl)2 and C6H5CH2OH


74.

The major product P formed in the following reaction is


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75.

The correct order of increasing reactivity of the following alkyl halides, CH3CH2CH(Br)CH3

(I) CH3CH2CH(Br)CH3

(II) (CH3)2CClCH2CH3

(III) CH3CH2CH2Cl and

(IV) Towards SN2 displacement is

  • I < II < III < IV

  • III < I < IV < II

  • III < I < II < IV

  • II < IV < I < III


76.

The product Y for the below reaction is


77.

The product formed in the following reaction is


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78.

4-nitrotoluene is treated with bromine to get compound 'P' which is reduced with Sn and HCl to get compound 'Q'. 'Q' is diazotised and the product is treated with phosphinic acid to get compound 'R'. 'R' is oxidised with alkaline solution KMnO4 to get the final product. Identify the final product.

  • 2-bromobenzoic acid

  • 2-bromo-4-hydroxybenzoic acid

  • benzoic acid

  • 3-bromobenzoic acid


A.

2-bromobenzoic acid

Step 1: Since, NO2 is m-directing group while -CH3 group is o- and p- directing group. Thus, Br group attach at o- position with respect to CH3 and m-position with respect to NO2 group.

Step 2: On reduction with Sn/ HCl, NO2 group changes to -NH2 group.

Step 3: On treatment with NaNO2 + HCl; NH2 changes to diazo group, i.e. Q shows diazotisation.

Step 4: On treatment with H3PO2, only diazo group (N2Cl) reacts and gets removed.

Step 5:On oxidation with KMnO4/ OH-, -CH3 group changes to -COOH group.


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79.

Which one of the following is an allylic halide?

  • 2-chlorobutane

  • Chloroethene

  • 3-bromopropene

  • 2-chlorotoluene


80.

Which one of the following undergoes iodoform test?

  • Propanal

  • Ethanal

  • Benzophenone

  • Benzaldehyde


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