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Chemistry MCQs for NEET — Practice Questions with Answers

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Phenol and benzoic acid can be distinguished by:

aqueous NaHCO₃

aqueous NaNO₃

aqueous NaOH

conc. H₂SO₄

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Explanation

Phenol being weak acid does not react with aq. NaHCO₃.

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Glycerol on oxidation with dil. HNO₃ gives:

tartronic acid

mesoxalic acid

oxalic acid

glyceric acid

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Explanation

${CHOH}_{|}^{|}_{{CH}_{2} OH}^{{CH}_{2} OH} \to_{D i l . H N O_{3}}^{[O]} {CHOH}_{|}^{|}_{{CH}_{2} OH}^{COOH} (g l y c e r i c a c i d)$

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Ethyl Chloride is converted into diethyl ether by

Wurtz synthesis

Grignard reaction

Perkin's reaction

Williamson's synthesis

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Explanation

(d) C₂H₅Cl + NaOC₂H₅ $\to$ C₂H₅-O-C₂H₅ + NaCl

It is an example of Williamson's synthesis. Limitations of williamson's Synthesis 3 $°$ alkyl halide does not gives Williamson's synthesis. If 3 $°$ alkyl halide used in reaction then alkene formed.

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Which is an excellent antiseptic?

Phenol

Benzyl alcohol

Benzaldehyde

Acetic acid

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Explanation

(a) Phenol is used in carbolic soaps.

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Proof spirit contains about:

48% alcohol by mass

10% alcohol by mass

5% alcohol by mass

90% alcohol by mass

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Explanation

The percentage of alcohol is expressed as proof spirit for tax lavy. It conatins 57.1% (by vol.) or 48% (by mass) of alcohol.

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The value of C-O-C angle in ether molecule is :

180 $°$

150 $°$

90 $°$

110 $°$

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Explanation

Bond angle is 110 $°$ due to steric hindrance of bulky alkyl gps.

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Ethyl alcohol is also known as:

spirit of wine

methyl carbinol

grain alcohol

all of these

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Explanation

C₂H₅OH is obtained from grains, used as wine and called methyl carbinol.

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The products formed in the following reaction, C₆H₅-O-CH₃ + HI $\overset{Heat}{\to}$ are:

C₆H₅OH and CH₃I

C₆H₅I and CH₃OH

C₆H₅CH₃ and HOI

C₆H₆ and CH₃OI

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Explanation

(a) C₆H₅OCH₃ + HI $\to$ C₆H₅OH + CH₃I

Phenol shows stabilization due to resonance.

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CH $\equiv$ CH $\overset{O_{3} / NAOH}{\to}$ X $\overset{Zn / {CH}_{3} COOH}{\to}$ Y is:

CH₂OH-CH₂OH

CH₃CH₂OH

CH3COOH

CH₃OH

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Explanation

(a) CHOCHO $\overset{Reduction}{\to}$ CH₂OHCH₂OH

(X)

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Which of the following reacts with water

CHCl₃

CCl₄

CCl₃CHO

CH₂ClCH₂Cl

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Explanation

CCl₃CHO $\to$ CCl₃CH(OH)₂

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