The function of ZnCl2 in Lucas test for alcohols is:

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

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Organic Chemistry
114

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

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.

Organic Chemistry MCQ with Answers

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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

118) In water, H−O−H bond angle is 104.5^o, but in ethers (R−O−R), the C−O−C bond angle is about 110^o. The reason to justify it, is:

Positive inductive effect of alkyl groups is more than that of hydrogen

The alkyl group is polar, while hydrogen is not

Distortion caused by the lone pair of oxygen atom is more than compensated by the bulky alkyl groups

The hybridisation of oxygen atoms is different in ethers and in water

Answer is:

Distortion caused by the lone pair of oxygen atom is more than compensated by the bulky alkyl groups

Explanation:

Bulky groups counter balance the repulsion caused by the lone pairs.

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

Organic Chemistry MCQ with Answers

Related Organic Chemistry MCQ with Answers

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

118) In water, H−O−H bond angle is 104.5o, but in ethers (R−O−R), the C−O−C bond angle is about 110o. The reason to justify it, is:

Distortion caused by the lone pair of oxygen atom is more than compensated by the bulky alkyl groups

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:

118) In water, H−O−H bond angle is 104.5^o, but in ethers (R−O−R), the C−O−C bond angle is about 110^o. The reason to justify it, is: