HSC Science (General) 12th Standard Board Exam - Maharashtra State Board Question Bank Solutions for Chemistry

The following amines is the product of Gabriel phthalimide synthesis.

Mendius reaction is used to convert _____________

Name the process of breaking C-X bond by ammonia in preparation of amines.

Write the order of reactivity of alkyl halides with ammonia.

Write reactions to bring about the following conversions.

Acetamide to Ethylamine

Write reactions to bring about the following conversions.

Acetamide to methylamine

Explain Hoffmann’s exhaustive alkylation with suitable reactions.

Write reactions for the preparation of ethanamine using Gabriel phthalimide synthesis.

Why cannot aniline be prepared by Gabriel phthalimide synthesis?

Explain the following reaction with a suitable example.

Hofmann elimination reaction

Write the name of the product formed by the action of LiAlH₄/ether on acetamide.

Identify the compo ds A and B in the following reactions:

\[\ce{A ->[Nitrating mixture] B ->[(i) Sn/cone. HCI][(ii) NaOH] Aniline}\]

Identify A and B in the following reaction.

\[\ce{C6H5CH2Br ->[Alco.][KCN] A ->[Na/Ethanol][reduction] B}\]

Write the name of reduction product formed when ethyl cyanide is treated with sodium and alcohol.

p - type semi-conductors are made by mixing silicon with impurities of ______.

In a semiconductor, acceptor impurity is.................................

1. antimony
2. indium
3. phosphorous
4. arsenic

What type of semiconductor is obtained when silicon is doped with boron? 

To prepare n-type semiconductor the impurity to be added to silicon should have the following number of valence electrons:

(a) 2

(b) 3

(c) 4

(d) 5

When a hole is produced in P-type semiconductor, there is _______.

What is ‘effective atomic number’ (EAN)?