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Aldol condensation will not take place in [1999]

HCHO

CH₃CHO

CH₃COCH₃

CH₃CH₂CHO

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Explanation

(a) Aldol condensation in aldehydes is due to presence of $α$ -hydrogen atoms. These aldehydes which does not have $α$ -hydrogen atom like HCHO, does not give aldol condensation.

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RCOOH $\to$ RCH₂OH. This mode of reduction of an acid to alcohol can be affected only by:

Zn/HCl

Na-alcohol

aluminium isopropoxide and isopropyl alcohol

LiAlH₄

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Explanation

LiAlH₄ is used for converting $-$ COOH to $-$ CH₂OH

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Which of the following has most acidic proton?

CH₃COCH₃

(CH₃)₂C=CH₂

CH₃COCH₂COCH₃

(CH₃.CO)₃CH

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Explanation

(d) Three electron-withdrawing groups attached on -CH.

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Which one of the following can be oxidised to the corresponding carbonyl compound? [2004]

2-hydroxy propane

Ortho-nitro phenol

Phenol

2-methyl-2-hydroxy propane

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Explanation

Among the given options, only 2-hydroxy propane (isopropyl alcohol) can be oxidized to the corresponding carbonyl compound, which is acetone. The other options, such as ortho-nitro phenol, phenol, and 2-methyl-2-hydroxy propane, cannot be easily oxidized to carbonyl compounds.

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Polarisation of electrons in acrolein may be written as

$\overset{δ +}{C} H_{2} = CH - CH = \overset{δ -}{O}$

$\overset{δ +}{C} H_{2} = \overset{δ +}{C} H - CH = \overset{}{O}$

$\overset{δ +}{C} H_{2} = \overset{}{C} H - CH = \overset{δ +}{O}$

$\overset{δ +}{C} H_{2} = CH - \overset{δ +}{C} H = O$

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The conversion of CH₃OH to CH₃COOH can be brought in by:

K₂Cr₂O₇/H⁺

CO + Rh

KMnO₄

H₃PO₄

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Explanation

CH₃OH + CO $\to_{catalyst}^{Rh}$ CH₃COOH

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Benzaldehyde and acetaldehyde can be distinguished by:

iodoform test

2:4 DNP test

${NH}_{3}$ reaction

Wolff-Kishner's reduction

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Explanation

${CH}_{3} CHO$ gives positive iodoform test due to the present of

${CH}_{3} - \underset{O}{\underset{| |}{C}} - unit$

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Fehling's solution is:

acidified copper sulphate solution

ammoniacal cuprous chloride solution

copper sulphate, Rochelle salt + NaOH

none of the above

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Explanation

The solution produces CuO in it.

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Which compounds will not reduce Fehling's solution?

Methanal

Ethanal

Trichloroethanal

Benzaldehyde

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Explanation

An exceptional aldehyde which does not reduce Fehling's solution.

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Acetaldehyde reacts with

only electrophiles

only nucleophiles

only free radicals

both electrophiles and nucleophiles

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