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Chemistry MCQs for NEET — Practice Questions with Answers

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In Kjeldahl's method, nitrogen present is estimated as:

N₂

NH₃

NO₂

None of these

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Explanation

(b) NH₃

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In Kjeldahl's method of estimation of nitrogen, K₂SO₄ acts as:

an oxidising agent

catalytic agent

hydrolysing agent

boiling point elevator

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Explanation

On adding salt boiling point increased.

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A compound which does not give a positive test in Lassaigne’s test for nitrogen is:-

urea

hydrazine

azobenzene

phenyl hydrazine

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Explanation

Lassigne’s test is not given by those compounds in whihc carbon is absent. So, Hydrazine $(H_{2} N - {NH}_{2})$ can't give this test

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The IUPAC name of CH₃-CH=CH-C-OH is:-

But-1-en-4-oic acid

1-hydroxybut-2-en-1-one

But-2-en-1-oic acid

But-2-en-4-oic acid

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The IUPAC name of CH₂=CH-CH=CH₂ is:

Butane

Buta-1,3-diene

Butane-1,3-diene

none of these

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The IUPAC name of CH2|COOH-CH2-CH2|COOH IS:

Pentane-1, 5-dioic acid

Pcntane-1, 5-dicarboxylic acid

Propane-1, 3-dioic acid

none of these

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The IUPAC name of HOOC-CH=CH-COOH is:

But-2-ene-1,4-dicarboxylic acid

But-2-ene-1,4-dioic acid

Ethene dicarboxylic acid

Ethene dioic acid

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Explanation

The IUPAC name for HOOC-CH=CH-COOH is but-2-ene-1,4-dioic acid. The longest carbon chain has 4 carbon atoms, with a double bond at the 2nd position, and carboxyl (-COOH) groups at the 1st and 4th positions, hence the name but-2-ene-1,4-dioic acid.

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The IUPAC name of CH₃-CH=CH-COOH is:

But-2-en-1-oic acid

But-1-en-oic acid

But-2-en-1-carboxylic acid

Propene-1-carboxylic acid

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The IUPAC name of CH3 -CHOH- CH₂- CO-CH₃ is:

2-Hydroxypentan-4-one

4-Hydroxypentan-2-one

4-oxopentan-2-ol

2-oxopentan-4-ol

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Explanation

The key functional groups are the alcohol (-OH) at carbon 4 and the ketone (>C=O) at carbon 2. The longest carbon chain is 5, so the root name is 'pentan'. The '4-hydroxy' prefix indicates the alcohol group at carbon 4, and the '2-one' suffix indicates the ketone group at carbon 2.

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The IUPAC name ofCH₃ — CH₂— ${C_{|}^{|}}_{OH}^{Br} - \overset{Cl}{\overset{|}{CH}}$ — CH₂- Cl is:

3-Bromo-4, 5-dichloropentan-3-ol

3-Bromo-1, 2-dichloro-3-hydroxypentane

3-Bromo-1, 2-dichloropentan-3-ol

3-Bromo-4, 5-dichloro-3-hydroxypentane

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Explanation

The longest carbon chain is 5, so the root name is 'pentan'. The '3-bromo' prefix indicates the bromine atom at carbon 3. The '1,2-dichloro' prefix indicates the chlorine atoms at carbons 1 and 2. The '3-ol' suffix indicates the alcohol (-OH) group at carbon 3.

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