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Chemistry MCQs for NEET — Practice Questions with Answers

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An organic compound A reacts with PCl₅ to give B. The compound B with sodium metal gives n-butane. Thus, A and B are:

C₂H₅OH and C₂H₅Cl

C₂H₅Cl and C₂H₅ONa

C₃H₇OH and CH₃CH₂CH₂OCl

C₄H₉OH and C₄H₉OCl

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Explanation

(a) C₂H₅OH $\overset{{PCl}_{5}}{\to}$ C₂H₅Cl $\to_{Wurtz reaction}^{Na}$ C₂H₅C₂H₅

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The boiling point of p-nitrophenol is higher than that of o-nitrophenol because

NO₂group at p-position behaves in a different way from that at o-position

intramolecular hydrogen bonding exists in p-nitrophenol

there is intermolecular hydrogen bonding in p-nitrophenol

p-nitrophenol has a higher molecular weight than o-nitrophenol

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Explanation

The boiling point of p-nitrophenol is higher than that of o-nitrophenol because in p-nitrophenol, intermolecular hydrogen bonding occurs between the hydrogen of the -OH group and the oxygen of the -NO2 group. This intermolecular hydrogen bonding increases the strength of the intermolecular forces, resulting in a higher boiling point.

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Which of the following compund is oxidised to prepare methyl ethyl ketone?

2-propanol

1-butanol

2-butanol

tert-butyl alcohol

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Explanation

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Ethers are not distilled to dryness for fear of explosion. This is due to formation of:

oxides

alcohol

ketones

peroxides

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Explanation

Peroxides decompose violently on heating.

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Absolute alcohol contains:

40% H₂O

10% H₂O

5% H₂O

100% C₂H₅OH

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Explanation

(d) Absolute alcohol is 100% alcohol.

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Dialkyl sulphides are known as:

sulphonal

mercaptan

thioethers

thioesters

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Explanation

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Diethyl ether absorbs oxygen to form:

red colored sweet smelling compound

acetic acid

ether suboxide

ether peroxide

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Explanation

Diethyl ether absorbs oxygen from the air to form an unstable and highly explosive compound called ether peroxide. It is a colorless oily liquid and is an important industrial hazard.

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Propan-1-ol may be prepared by reaction of propene with

CH₃COOH

H₃BO₃

B₂H₆/NaOH-H₂O₂

H₂SO₄/H₂O

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Explanation

6CH₃CH=CH₂ $\overset{B_{2} H_{6}}{\to}$ 2(CH₃CH₂CH₂)₃B

Tri-n-propyl borane

$↓$ H₂O₂/OH^-

6CH₃CH₂CH₂OH

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Power alcohol is a mixture of petrol and alcohol in the ratio:

4:1

1:4

2:1

1:2

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Explanation

Power alcohol is used to generate power.

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The formula for allyl alcohol is:

CH₃-CH=CHCl

CH₂=CHCH₂OH

CH₂ClCH₂CH₃

none of these

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Explanation

(b) -OH gp. is on allyl gp. (CH₂=CH-CH₂-)

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