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Aldehyde ketones & carboxylic Acid MCQs for NEET — Chemistry Questions with Answers

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Acid chlorides react with Grignard reagents to give:

esters

ethers

carbonyl compounds

none of these

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Amides may be converted into amines by reaction named after:

Perkin

Claisen

Hofmann

Kekule

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Explanation

This is Hofmann's bromamide reaction.

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When formic acid reacts with PCl_3,it forms:

formyl chloride

acetyl chloride

methyl chloride

propionyl chloride

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Explanation

(a) 3HCOOH+PCl₃ $\to$ $\underset{(Less stable)}{3 HCOCl}$ +H₃PO₃

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What are the organic products formed in the following reaction?

C₆H₅ $-$ COO $-$ CH_{3 $\to_{2 . H_{3} O^{+}}^{1 . {LiAIH}_{4}}$}

C₆H₅ $-$ CH₂ $-$ OH and CH₃ $-$ OH

C₆H₅ $-$ OH and CH₃ $-$ OH

C₆H₅ $-$ CH₃ and CH₃ $-$ OH

C₆H₅ $-$ CH₂ $-$ OH and CH₄

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Explanation

(a) C₆H₅COOCH₃ $\overset{Red}{\to}$ C₆H₅CH₂OH+CH₃OH

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Which acid gives wine red colour with neutral FeCl₃?

Propanoic acid

Acetic acid

Formic acid

None of these

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Explanation

(b) It is a test for acetate radical.

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The reverse of esterification is known as:

acidolysis

trans-esterification

hydrolysis

neutralization

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Explanation

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A distinctive and characteristic functional group in fat is:

keto group

ester group

basic group

none of these

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Explanation

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Preparation of β-hydroxy ester is favoured by:

Cannizzaro's reaction

Reformatsky reaction

Claisen condensation

Wittig reaction

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Explanation

The Reformatsky reaction is a method for the preparation of Î²-hydroxy esters. It involves the reaction of an Î±-halo ester with a ketone or aldehyde in the presence of zinc metal, which forms a zinc enolate intermediate that reacts with the carbonyl compound to give the Î²-hydroxy ester product.

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The IUPAC name of carproic acid is :

pentanoic acid

hexanoic acid

heptanoic acid

octanoic acid

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Explanation

(b) Caproic acid is ${CH}_{3} ({CH}_{2})_{4} COOH .$

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Lactic acid extracted from muscle is:

levo-rotatory

dextro-rotatory

similar with synthetic lactic acid

none of the above

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Explanation

(b) Lactic acid prepared from meat extract of muscles is dextro-rotatory and is therefore called sarcolactic acid

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