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HSC Science (Computer Science) 12th Standard Board Exam - Maharashtra State Board Important Questions for Chemistry

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Chemistry
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Explain the fact that in alkyl aryl ethers, the alkoxy group is ring activating and ortho/para directing towards electrophilic aromatic substitution.

Appears in 1 question paper
Chapter: [11] Alcohols, Phenols and Ethers
Concept: Ethers

How will you prepare diethyl ether by dehydration of alcohol?

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Chapter: [11] Alcohols, Phenols and Ethers
Concept: Ethers

Write chemical reactions of following reagents on methoxyethane:

hot HI

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Chapter: [11] Alcohols, Phenols and Ethers
Concept: Classification of Alcohols, Phenols and Ethers

Convert the following:

Ethyl alcohol into ethyl acetate.

Appears in 1 question paper
Chapter: [11] Alcohols, Phenols and Ethers
Concept: Nomenclature of Alcohols, Phenols and Ethers

Write preparation of diethyl ether.

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Chapter: [11] Alcohols, Phenols and Ethers
Concept: Ethers

Convert the following :

cumene to phenol.

Appears in 1 question paper
Chapter: [11] Alcohols, Phenols and Ethers
Concept: Preparation of Alcohols and Phenols

Write the reactions involved in dehydration of 1°, 2° and 3° alcohols.

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Chapter: [11.01] Alcohols
Concept: Addiction > Alcohol >> Mechanism of Dehydration of Alcohols

Which among the following reducing agents is NOT used to reduce acetaldehyde to ethyl alcohol?

(A) Na-Hg and water

(B) Zn-Hg and conc. HCl

(C) H2-Raney Ni

(D) LiAlH4/H+

Appears in 1 question paper
Chapter: [11.01] Alcohols
Concept: Addiction > Alcohol >> Methods of Preparation

How are the following compounds prepared?

Benzyl alcohol from benzyl chloride.

Appears in 1 question paper
Chapter: [11.01] Alcohols
Concept: Addiction > Alcohol >> Methods of Preparation

Identify the compound 'B' in the following series of reaction:

(A) n-propyl chloride

(B) Propanamine

(C) n-propyl alcohol

(D) Isoproply alcohol

Appears in 1 question paper
Chapter: [11.01] Alcohols
Concept: Addiction > Alcohol >> Methods of Preparation

Which of the following reagents is best for the following conversion?

(A) LiAlH4

(B) 

(C) H2/Ni, 453 K

(D) Zn-Hg+HCl(con)

Appears in 1 question paper
Chapter: [11.01] Alcohols
Concept: Addiction > Alcohol >> Methods of Preparation

How is ethanol prepared from methanal by using Grignard reagent?

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Chapter: [11.01] Alcohols
Concept: Addiction > Alcohol >> Methods of Preparation

`CH_3-CH_2-Br"Alcoholic KOH"/""> B " HBR"/"">C"Na/Eather"/"">D`, the Compound D is

(A) ethane

(B) propane

(C) n-butane

(D) n-pentane

Appears in 1 question paper
Chapter: [11.01] Alcohols
Concept: Chemical Properties of Alcohols and Phenols

Which of the following is the first oxidation product of secondary alcohol?

(A) Alkene

(B) Aldehyde

(C) Ketone

(D) Carboxylic acid

Appears in 1 question paper
Chapter: [11.01] Alcohols
Concept: Addiction > Alcohol >> Secondary and Tertiary Alcohols

How will you prepare ethanol, propan-2-ol and 2-methylpropan-2-ol from Grignard’s reagent?

Appears in 1 question paper
Chapter: [11.01] Alcohols
Concept: Addiction > Alcohol >> Methods of Preparation

How are the following compounds prepared?

Propan-1-ol from propanal

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Chapter: [11.01] Alcohols
Concept: Addiction > Alcohol >> Methods of Preparation

Propene on oxidation with diborane in presence of alkaline hydrogen peroxide gives

(a) propane-1- ol

(b) propane-2-ol

(c) allyl alcohol

(d) propane-1, 2-diol

 

Appears in 1 question paper
Chapter: [11.01] Alcohols
Concept: Addiction > Alcohol >> Methods of Preparation

Write resonance structures of aniline. What is the action of benzene diazonium chloride on ethanol? 

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Chapter: [11.01] Alcohols
Concept: Commercially Importance Alcohols

Identify A and B respectively in the following reaction:
\[\ce{tert-butyl alcohol ->[20‰H2SO4][363K] A + H2O ->[HBr][H2O2] B}\]

Appears in 1 question paper
Chapter: [11.01] Alcohols
Concept: Addiction > Alcohol >> Methods of Preparation

Write chemical reactions to prepare ethanamine from:

Acetonitrile

Appears in 1 question paper
Chapter: [11.01] Alcohols
Concept: Addiction > Alcohol >> Methods of Preparation
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