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Chemistry MCQs for NEET — Practice Questions with Answers

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Acetic acid is obtained when:

glycerol is heated with sulphuric acid

methyl alcohol is oxidized with potassium permanganate

acetaldehyde is oxidized with potassium dichromate and sulphuric acid

calcium acetate is distilled in presence of calcium formate

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Explanation

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Main product of the reaction,

CH₃CONH₂+HNO₂ $\to$ ... is:

CH₃COOH

CH₃CH₂NH₂

CH₃NH₂

CH₃COONH₄

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Explanation

(a) CH₃CONH₂ $\overset{{HNO}_{2}}{\to}$ CH₃COOH+H₂O+N₂; the function of HNO₂ is to convert $—$ NH₂gp. to $—$ OH gp.

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The $-$ COOH group in a carboxylic acid can be replaced by 'H' by heating the acid with:

Zn with HCl

H₂in presence of nickel

sodalime

bromine and concentrated aqueous alkali

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Explanation

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The compound which on reduction with LiAlH₄gives two alcohols:

CH₃COOCH₃

CH₃CO-O-OC₂H₅

CH₃COCH₃

CH₃CHO

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Explanation

(a) CH₃COOCH₃ $\overset{{LiAlH}_{4}}{\to}$ CH₃CH₂OH+CH₃OH

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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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