NEET
Practice Test 12
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An ester (A) with molecular fomula,C9H10O2 was treated with excess of CH3MgBr and the complex so formed was treated with H2SO4 to give an olefin (B). Ozonolys is of (B)gavea ketone with molecular formula C8H8O which shows positive iodoform test. The structure of(A) is

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Benzoic acid gives benzene on being heated with X and phenol gives benzene on being heated with Y. Therefore X and Y are respectively

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Aldehydes that do not undergo aldol condensation are

1.propanal 2.trichloroethanal

3.methanal 4.ethanal

5.benzaldehyde

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In which of the following, the number of carbon atoms does not remain same when carboxylic acid is obtained by oxidation

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    Ketones on oxidation give carboxylic acids with lesser number of carbon atoms, i.e.,

    \(CH_{3}COCH_{3}\overset{[O]}{\rightarrow}CH_{3}COOH+CO_{2}+H_{2}O\)

The above compound describes a condensation polymer which can be obtained in two ways : either treating 3 molecules of acetone (CH3COCH3) with conc. H2SO4 or passing propyne(CH3 C≡CH) through a red hot tube. The polymer is

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    Acetone or Propyne form mesitylene (1,3,5-trimethyl benzene) on distillation with conc. H2SO4.

Which of the following gives reddish brown precipitate on heating with a solution of CuSO4 and alkaline sodium potassium tartarate?

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    Only aldehydes give reddish brown ppt. with Fehling’s solution.

The above shown polymer is obtained when a carbonyl compound is allowed to stand. It is a white solid. The polymer is

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Which of the following is the correct decreasing order of acidic strength of

(i)Methanoic acid (ii)Ethanoic acid
(iii)Propanoic acid (iv)Butanoic acid

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    An electron releasing substituent (+I) intensify the negative charge on the anion resulting in the decrease of stability and thus decreases the acidity of the acid. Hence acid character decreases as the +I-effect of the alkyl group increases as
    \(CH_{3}^{-}<CH_{3}CH_{2}^{-}<CH_{3}CH_{2}CH_{2}^{-}<CH_{3}CH_{2}CH_{2}CH_{2}^{-}\)
    Hence the order becomes :(i) > (ii) > (iii) > (iv)

The catalyst used in the Wacker process of oxidation of ethyne to ethanal is

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    Ethyne get converted to aldehydes and ketones when treated with an acidified aqueous solution of palladium chloride (PdCl2) and cupric chloride (CuCl2) in presence of air or oxygen. This method is known as Wacker’s process.

The carboxyl functional group (– COOH) is present in

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ALDEHYDES, KETONES AND CARBOXYLIC ACIDS
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