Assertion -Aldol condensation can be catalysed both by acids and bases- Reason- -Hydroxy aldehydes or ketones readily undergo acid catalysed dehydration-

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Standard XII

Chemistry

Effect on Conductance in Titration

Assertion :Al...

Question

Assertion :Aldol condensation can be catalysed both by acids and bases. Reason: $β$ -Hydroxy aldehydes or ketones readily undergo acid catalysed dehydration.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Both carbanions (formed in presence of base) and enol form (formed in presence of an acid) act as nucleophiles and hence add on the carbonyl group of aldehydes and ketones to give aldols.

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Reason (R) Sodium ethoxide may be prepared by the reaction of ethanol with aqueous NaOH.
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Q. Assertion :Aldol condensation can be catalysed both by acids and bases. Reason:

β

Hydroxy aldehydes or ketones readily undergo acid catalysed dehydration.

Assertion – The non-fusible impurities present in iron ore are removed by $C a C O_{3}$ .

Reason: $C a C O_{3}$ which decomposes into $C a O$ and $C O_{2}$ . The $C a O$ formed reacts with $S i O_{2}$ to remove silica

Q. Assertion: The impurities such as

{SiO}_{2}

present in iron ore is removed by

{CaCO}_{3}

.

Reason:

CaO

formed by decomposition of

{CaCO}_{3}

reacts with

{SiO}_{2}

to form slag.

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Assertion :Aldol condensation can be catalysed both by acids and bases. Reason: β-Hydroxy aldehydes or ketones readily undergo acid catalysed dehydration.

Assertion :Aldol condensation can be catalysed both by acids and bases. Reason: $β$ -Hydroxy aldehydes or ketones readily undergo acid catalysed dehydration.