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GS
GS Set-1
Chemistry
Organic Chemistry
113

Organic Chemistry MCQ with Answers

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

Organic Chemistry MCQ with Answers

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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

116) Osmium tetraoxide is used for:

Hydroxylation of alkynes to give trans−isomer

Hydroxylation of alkenes to give cis−isomer

Hydroxylation of alkenes to give syn−addition

Hydroxylation of alkenes to give anti−addition

Answer is:

Hydroxylation of alkenes to give syn−addition

117) Dehydration of cyclopenylcarbinol with conc. H₂SO₄ forms:

Cyclopentene

Cyclohexene

Methyl cyclopentane

None of these

Answer is:

Cyclohexene

Organic Chemistry MCQ with Answers

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

o−nitrophenol

Organic Chemistry MCQ with Answers

Related 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

116) Osmium tetraoxide is used for:

Hydroxylation of alkenes to give syn−addition

117) Dehydration of cyclopenylcarbinol with conc. H2SO4 forms:

Cyclohexene

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

117) Dehydration of cyclopenylcarbinol with conc. H₂SO₄ forms: