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GS
GS Set-1
Chemistry
Organic Chemistry
111

Organic Chemistry MCQ with Answers

111) Which of the following is the most suitable method for removing the traces of water from ethanol?

Heating with sodium metal

Passing dry HCl gas through it

Distilling it

Reacting with Mg

Answer is:

Reacting with Mg

Explanation:

Magnesium first reacts with ethanol to form magnesium ethoxide, which then reacts with water to regenerate ethanol along with magnesium hydroxide.

Organic Chemistry MCQ with Answers

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112) Oxymercuration−demercuration reaction of 1−methyl cyclohexene gives:

trans−2−methyl cyclohexanol

cis−2−methyl cycloheaxanol

1−methyl cyclohexanol

Mixture of cis− and trans−2−methyl cyclohexanol

Answer is:

1−methyl cyclohexanol

Explanation:

During oxymercuration−demercuration reactions, products corresponding to Markownikov′s addition of H₂O are formed.

113) Phenol, when it first reacts with concentrated sulphuric acid and then with concentrated nitric acid, gives:

2,4,6−trinitrobenzene

o−nitrophenol

p−nitrophenol

Nitrobenzene

Answer is:

o−nitrophenol

114) The function of ZnCl₂ in Lucas test for alcohols is:

To act as acid catalyst and react with HCl to form H₂ZnCl₄

To act as base catalyst and react with NaOH to form Na₂Zn(OH)₄

To act as amphoteric catalyst

To act as neutral catalyst

Answer is:

To act as acid catalyst and react with HCl to form H₂ZnCl₄

Explanation:

In presence of anhydrous ZnCl₂, alcohol reacts with conc. HCl to produce alkyl chloride.

115) HBr reacts with CH₂=CH−OCH₃ under anhydrous conditions at room temperature to give:

CH₃CHO and CH₃Br

BrCH₂CHO and CH₃OH

BrCH₂−CH₂−OCH₃

CH₃−CHBr−OCH₃

Answer is:

CH₃−CHBr−OCH₃

Organic Chemistry MCQ with Answers

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111) Which of the following is the most suitable method for removing the traces of water from ethanol?

Reacting with Mg

Organic Chemistry MCQ with Answers

Related Organic Chemistry MCQ with Answers

112) Oxymercuration−demercuration reaction of 1−methyl cyclohexene gives:

1−methyl cyclohexanol

113) Phenol, when it first reacts with concentrated sulphuric acid and then with concentrated nitric acid, gives:

o−nitrophenol

114) The function of ZnCl2 in Lucas test for alcohols is:

To act as acid catalyst and react with HCl to form H2ZnCl4

115) HBr reacts with CH2=CH−OCH3 under anhydrous conditions at room temperature to give:

CH3−CHBr−OCH3

Organic Chemistry MCQ with Answers

114) The function of ZnCl₂ in Lucas test for alcohols is:

To act as acid catalyst and react with HCl to form H₂ZnCl₄

115) HBr reacts with CH₂=CH−OCH₃ under anhydrous conditions at room temperature to give:

CH₃−CHBr−OCH₃