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Chemistry NEET Questions — Free MCQ Practice

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In presence of light and heat toluene chlorinated and react with aq. NaOH to give

A. O - Cresol B. P - Cresol C. Mixture of (1) and (2) D. Benzoic acid

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Sulphonation of compound A followed by fusion with NaOH gives mixture of O- cresol & p- cresol. compound A is

A. Benzene B. Toluene C. phenol D. Benzene sulphonic acid

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Explanation

Toluene, when subjected to sulphonation, mainly forms ortho and para isomers of toluenesulfonic acid. Upon fusion with NaOH, these toluenesulfonic acids are converted to o-cresol and p-cresol respectively. Hence, compound A is toluene.

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Assertion and Reason type Questions. Direction:- In each of the following Questions Read the Assertion(A) and Reason (R) carefully. A : Pyrrole is an aromatic heterocyclic compound R : It has a cyclic, delocalised $ 6 \nu $ electrons

A. If both A and R are true and R is the Correct explanation of A B. If both A and R are true but R is not the Correct explanation of A C. If A is true but R is false D. If both A and R are false E. If A is false but R is true

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Explanation

Pyrrole is indeed an aromatic heterocyclic compound because it has a 6Ï€ electron system that is delocalized over the ring, following HÃ¼ckelâ€™s rule (4n + 2 Ï€ electrons, where n = 1). Therefore, both the assertion and reason are true, and the reason correctly explains the assertion.

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Assertion and Reason type Questions. Direction:- In each of the following Questions Read the Assertion(A) and Reason (R) carefully. A : $CH_4$ does not react with $Cl_2$ in dark R : Chlorination of $CH_4$ takes place in Sunlight

A. If both A and R are true and R is the Correct explanation of A B. If both A and R are true but R is not the Correct explanation of A C. If A is true but R is false D. If both A and R are false E. If A is false but R is true

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Explanation

Correct explanation :- Chlorination of $ CH_4 $ is free radical reaction and free radicals are obtained in sunlight.

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Assertion and Reason type Questions. Direction:- In each of the following Questions Read the Assertion(A) and Reason (R) carefully. A : Neopentane forms only one monosubstitated Compound R : Neopentane has high bond energy

A. If both A and R are true and R is the Correct explanation of A B. If both A and R are true but R is not the Correct explanation of A C. If A is true but R is false D. If both A and R are false E. If A is false but R is true

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Explanation

Neopentane forms only one monosubstituted compound due to its highly symmetrical structure, which makes all hydrogen atoms equivalent. However, this property is not due to high bond energy, but rather due to its unique molecular geometry. Therefore, the assertion is true, but the reason is false.

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Assertion and Reason type Questions. Direction:- In each of the following Questions Read the Assertion(A) and Reason (R) carefully. A : Addition of HBr to propene in presence of peroxide gives 1- bromo propane. R : The reaction occurs by Free radical mechanism

A. If both A and R are true and R is the Correct explanation of A B. If both A and R are true but R is not the Correct explanation of A C. If A is true but R is false D. If both A and R are false E. If A is false but R is true

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Explanation

R is Correct explanation of A

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Assertion and Reason type Questions. Direction:- In each of the following Questions Read the Assertion(A) and Reason (R) carefully. A : Styrene on reaction with HBr gives 2-bromo-2-phenylethane R :Benzyl radical is more stable than alkyl radicals

A. If both A and R are true and R is the Correct explanation of A B. If both A and R are true but R is not the Correct explanation of A C. If A is true but R is false D. If both A and R are false E. If A is false but R is true

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Explanation

Correct A:- gives -1- bromo-1- phenyl ethane Correct R:- Benzyl cation is more stable than alkyl cation

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In an attempt to prepare propane by Wurtz reaction 1 mole of methyl bromide and 1 mole of ethyl bromide
are treated with sodium. Assuming equal probability for all possible reaction. How many g of propane will be
obtained?

A.

44 g

B.

22 g

C.

33 g

D.

14.67 g

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Explanation

The possible reacts are
(i) CH3Br + 2Na + CH3Br ---->ï‚® CH3– CH3+ 2NaBr
(ii) CH3Br + 2Na + CH3CH2Br ----->ï‚® CH3CH2CH3+ 2NaBr
(iii) CH3CH2Br + 2Na + CH3CH2Br----> ï‚® CH3–CH2–CH2–CH3+ 2NaBr

1 mol of CH3CH2CH3 weight = 44g

Grams of CH3CH2CH obtained =44/3= 14.67g

Since 3 reactions of possible, the probability of formation of propane is 1/3and mass of propane obtained is
1/3 of mass of mass of 1 mol of propane i.e, 14.67 g

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Assertion and Reason type Questions. Direction:- In each of the following Questions Read the Assertion(A) and Reason (R) carefully. A :Melting point of neopentane is higher than that of iso-pentane R : Neopentane Contains a quaternary carbon

A. If both A and R are true and R is the Correct explanation of A B. If both A and R are true but R is not the Correct explanation of A C. If A is true but R is false D. If both A and R are false E. If A is false but R is true

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Explanation

Correct explanation :- Neopentane being symmetrical packs more closely in the crystal lattice than isopentane

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Assertion and Reason type Questions. Direction:- In each of the following Questions Read the Assertion(A) and Reason (R) carefully. A :Acetylene react with $NaNH_2$ to give Sodium acetylide and ammonia R : SP-hybridized carbon of acetylene are considerably electronegative

A. If both A and R are true and R is the Correct explanation of A B. If both A and R are true but R is not the Correct explanation of A C. If A is true but R is false D. If both A and R are false E. If A is false but R is true

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Explanation

R is the correct explanation of A

Chemistry MCQs for NEET — Practice Questions with Answers

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