HSC Science (General) १२ वीं कक्षा - Maharashtra State Board Important Questions for Chemistry

Identify the product ‘D’ in the following sequence of reactions:

\[\ce{H3C - CH2 - CH2 - Cl \underset{KOH}{\overset{Alc}{->}} 'B' \overset{HBr}{->} 'C' \underset{Elther}{\overset{Na}{->}}'D'}\]

Identify ‘A’ and ‘B’ in the following reaction :

\[\ce{CH3 - CH = CH2 ->[HBr]'A' ->[alc.KOH]'B'}\]

Discuss the mechanism of alkaline hydrolysis of bromomethane.

State and explain Markownikoff's rule with suitable example

which of the following carbocations is least stable?

(A) 

(B)

(C)

(D)

What is the action of bromine in alkaline medium on

i. CH₃CH₂NO₂

ii. 

The stability order for carbocation is _______.

(A) 2° > 3° > 1° 

(B) 3° > 2° > 1°

(C) 3° > 1° > 2°

(D) 1° > 3° > 2°

How are the following conversions carried out?

2-methylbutan-1-ol into 2 -methylbutanoic acid.

But-1-ene on reaction with HCl in the presence of sodium peroxide yields _______.

IUPAC name of is C₆H₅ − CH₂ − C − CH₂ − CH₂ − CH₂ − CH₃ is _______

(A) 1-Phenylhexan-2-one

(B) 6-Phenylhexan-5-one

(C) 1-Benzylhexan-5-one

(D) Dodecan-5-one

How is nitromethane prepared from the following?

alkyl halide

How is nitromethane prepared from the following?

α-nitroalkene

Draw a neat, labelled energy profile diagram for SN¹ reaction mechanism.

Identify 'A' in the following reaction -

(a) 2- Bromo-2 methylbutane

(b) 1 -Bromo-2,2-dimethylpropane

(c) 1 - Bromo - 3 -methylbutane

(d) 1 - Bromo- 2 -methylpropane

Complete and rewrite the balanced chemical equations

What is the action of the following on ethyl bromide
alcoholic solution of potassium hydroxide.

What is the action of the following on ethyl bromide:
moist silver oxide

Write a short note on Sandmeyer’s reaction. 

What are racemates?

Observe the following compounds and answer the questions given below.

      (I)

\[\ce{\underset{\text{(II)}}{CH3 - CH2 - Br}}\]

1. Identify the type of halides.
2. Explain the nature of the C – Br bond in both of these halides.
3. Which of these compounds will undergo aqueous alkaline hydrolysis readily? Write the reaction in support of your answer.