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Chemistry MCQs for NEET — Practice Questions with Answers

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How many secondary carbon atoms does methyl cyclopropane have ?

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Explanation

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The total number of secondary H-atoms in the structure given below are : $(CH_3)_2CHCH_2C_2H_5$

A. 1 B. 4 C. 3 D. 2

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Which of the following radicals are bivalent ? (a) Ethylidene (b) Vinylidene (c) Benzyl (d) Methylidyne

A. a,d B. a,b,d C. a,b D. a,b,c

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Explanation

Bivalent radicals are those that have two valence electrons available for bonding. Ethylidene (CH3-CH) and Vinylidene (CH2=C) are examples of bivalent radicals. Benzyl and Methylidyne are not bivalent radicals.

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The derived name of $ ( CH_3) _4C $ is -

Tetramethylmethane

2,2 - Dimethylpropane

Neopentane

None of these

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Explanation

The derived name of $(CH_3)_4C$ is Tetramethylmethane. This name reflects the structure of the compound, which consists of a central carbon atom bonded to four methyl groups.

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IUPAC name of $ (CH_3)_2 CH-CH_2 -CH_2Br $ is

A. 1 - bromo pentane B. 2 - methyl - 4 bromo pentane C. 1 - bromo - 3 methyl butane D. 2 - methyl - 3 bromo propane

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Explanation

The IUPAC name of $(CH_3)_2CH-CH_2-CH_2Br$ is 1-Bromo-3-methylbutane. According to the IUPAC nomenclature rules, the longest carbon chain is identified first, and then the substituents are named accordingly.

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Which one of the following IUPAC name is correct ?

A. 2 - methyl - 3 - ethyl pentane B. 2 - ethyl - 3 - methyl pentane C. 3 - ethyl - 2 - methyl pentane D. 3 - methyl - 2 - ethyl pentane

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The IUPAC name of the compound Br(Cl) CH.CF3 is :

A. haloethane B. 1,1,1 -trifluoro-2-bromo-2-chloroethane C. 2- bromo -2- chloro -1 ,1,1 -trifluoroethane D. 1- bromo -1 - chloro- 2,2 ,2 -trifloro ethane

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Explanation

The correct IUPAC name for the compound Br(Cl) CH.CF3 is 2-bromo-2-chloro-1,1,1-trifluoroethane. The numbering should ensure the lowest possible locants for the substituents. Hence, the correct option is 2-bromo-2-chloro-1,1,1-trifluoroethane.

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The structure of 4-methylpentene-2 is

A. $ (CH_3)_2 CH -CH_2CH=CH_2 $ B. $ (CH_3)_2CH-CH=CH-CH_3 $ C. $ (CH_3)_2CH-CH_2-CH=CH_2 $ D. $ (CH_3)_2C = CHCH_2CH_3 $

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Reasoning

Statement I : The general IUPAC name of esters is alkyl alkanoate.

Statement II: The simplest ester is HCOOCH3

If both Statement- I and Statement- II are true, and Statement - II is the correct explanation of Statement– I.

If both Statement - I and Statement - II are true but Statement - II is not the correct explanation of Statement – I.

If Statement - I is true but Statement - II is false.

If Statement - I is false but Statement - II is true.

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Reasoning Statement I : The IUPAC name for the compound $C_6H_5COOCH_2CH_2COOH$ is 3-benzoyloxy propanoic acid. Statement II : $C_6H_5CH_2O$ is called benzoyloxy group.

A. If both Statement- I and Statement- II are true, and Statement - II is the correct explanation of Statementâ€“ I. B. If both Statement - I and Statement - II are true but Statement - II is not the correct explanation of Statement â€“ I. C. If Statement - I is true but Statement - II is false. D. If Statement - I is false but Statement - II is true.

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