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Published on: 25/05/2021
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Download CBSE Class 12th Standard CBSE Chemistry question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Chemistry
Questions + Answers key
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1.
Discuss the role of Lewis acid in the preparation of aryl bromides and chlorides in the dark.
2.
Why iodoform has appreciable antiseptic property?
3.
Which of the compounds will react faster in SN1 reaction with the -OH ion?
CH3-CH2-Cl or C6H5-CH2-Cl
1.
The role of Lewis acids in the preparation of aryl chlorides and bromides is to generate the electrophiles, i.e., CI+and Br+ from the corresponding halogens
These electrophiles then react with arenes to form the corresponding aryl halides by electrophilic substitution mechanism.
2.
The antiseptic property of iodoform is due to liberation of 12 when it comes in contact with skin and not due to iodoform itself.
\(\underset { Iodo\ form }{ { CHI }_{ 3 } } \overset { contact\ with\ skinow }{ \longrightarrow } \underset { Iodine }{ { I }_{ 2 } } (has\ antiseptic\ property)\)
3.
SN1 reactions occur through carbocation intermediates. C6H5 -CH2CI readily undergoes ionization to give C6HsCH+2 which is stabilized by resonance.
In constant, CH3CH2CI does not undergo ionization to give CH3CH 2+.As a result, C6H5CH2CI reacts
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