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

How is ethanol prepared from methanal by using Grignard reagent?

`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

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

(A) Alkene

(B) Aldehyde

(C) Ketone

(D) Carboxylic acid

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

How are the following compounds prepared?

Propan-1-ol from propanal

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

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

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

Write chemical reactions to prepare ethanamine from:

Acetonitrile

Write chemical reactions to prepare ethanamine from:

Nitroethane

Write chemical reactions of following reagents on methoxyethane:

dilute H₂SO₄

Convert the following:

acetaldehyde to isopropyl alcohol.

Identify the weakest acidic compound amongst the following

(a) p-nitrophenol                 

(b) p-chlorophenol

(c) p-cresol                         

(d) p-raminophenol

Phenelzine is used as an

(a)  analgesic                      

(b) antiseptic

(c) antipyretic

(d) antidepressant

In phenol carbon atom attached to -OH group undergoes -

1. SP³ hybridisation          
2. SP hybridisation
3. SP² hybridisation
4. No hybridisation

How is carbolic acid prepared from the given compounds :

Aniline

Mention ‘two’ physical properties of carbolic acid.

Write chemical test to distinguish between carbolic acid and alcohol.

Draw the structure of aspirin.

What is the action of the following reagents on phenol - Bromine in CS₂ at low temperature.