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11th Standard English Medium Chemistry Subject Hydrocarbons Creative 2 Mark Questions with Solution Part - I

Published on: 25/06/2021

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Creative Questions in class 11 Chemistry Subject. It will helps to get more idea about question pattern in every Creative questions with solution.

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Std: 11th Standard - Chemistry

chapter: - Creative Questions

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Questions:

Generic 2

5 x 2 = 10

How are branched alkanes formed from normal alkanes?

What are conformation? Explain.

Show the classification of hydrocarbons.

What are activating and deactivating groups?

Define benzenoid and non-benzenoid compounds with example.

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Answers Key:

Generic 2

5 x 2 = 10

Isomerisation is a chemical process by which a compound is transformed into any its isomeric forms. Normal alkanes can be converted into branched alkanes in the presence of AICl₃ and HCI at 298 K.
CH₃ - CH₂ - CH₂ - CH₃ \(\overset { AIC{ I }_{ 3 }/HCI }{ \underset { 298\quad K }{ \longrightarrow } } \overset { { CH }_{ 3 }-CH-{ CH }_{ 3 } }{ \underset { { CH }_{ 3 } }{ | } } \)
This process is of great industrial importance. The quality of gasoline is improved by isomerising its components.

Each carbon in alkanes is Sp³hybridized and the four groups or atoms around the carbon are tetrahedrally bonded. In alkanes having two or more carbons, there exists free rotation about C-C single bond. Such rotation leaves all the groups or atoms bonded to each carbon into an infinite number of readily interconvertible three dimensional arrangements. Such readily interconvertible three dimensional arrangement of a molecule is called conformations.

	Activating	Deactivating
1.	The substituents that increase the rate of substitution compared to benzene are called activating groups.	The substituents that decrease the rate of substitution are called deactivating groups.
2.	The activating group increases the rate by increasing the electron density of the ring.	The deactivating group decreases the rate by decreasing the electron density of the ring.

(i) Benzenoid compounds:
Benzene and its derivatives are called benzenoid compounds

(ii) Non-benzenoid compounds:
The aromatic compounds that are not have benzene ring in their structure are called non-benzenoid compounds.