CBSE 11th Standard Chemistry Subject Organic Chemistry: Some Basic Principles and Techniques Ncert Exemplar 2 Mark Questions 2021
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CBSE 11th Standard Chemistry Subject Organic Chemistry: Some Basic Principles and Techniques Ncert Exemplar 2 Mark Questions 2021
11th Standard CBSE
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Reg.No. :
Chemistry
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Identify the most stable species in the following set of ions giving reasons
\(\overset { + }{ C } { H }_{ 3 },\overset { + }{ C } { H }_{ 2 }Br,\overset { + }{ C } { H }B{ r }_{ 2 },\overset { + }{ C } B{ r }_{ 3 }\)(a) -
Identify the most stable species in the following set of ions giving reasons
\(\overset { - }{ C } { H }_{ 3 },\overset { - }{ C } { H }_{ 2 }CI,\overset { - }{ C } { H }CI_{ 2 },\overset { - }{ C } CI_{ 3 }\)(a) -
Which of the following compounds will not exist as resonance hybrid. Give reason for your answer.
(a) CH3OH
(b) CH3CH = CHCH2NH2(a) -
For testing halogens in an organic compound with AgNO3 solution sodium extract (Lassaigne's test) is acidified with dilute HNO3. What will happen if a student acidifies the extract with dilute H2SO4 in place of diluate HNO3?
(a)
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CBSE 11th Standard Chemistry Subject Organic Chemistry: Some Basic Principles and Techniques Ncert Exemplar 2 Mark Questions 2021 Answer Keys
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\(\overset { + }{ C } { H }_{ 3 }\) is the most stable species because the replacement of H by Br increases positive charge on carbon atom and destabilizes the species.
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\(\overset { - }{ C } CI_{ 3 }\) is the most stable species because on replacing H by CI, negative charge on carbon is reduced and species is stabilized.
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(a) CH3OH as it lacks \(\pi \) -electrons hence it will not exist as resonance hybrid.
(b) CH3CH = CHCH2NH2 As the lone pair of electrons on the N-atom is not conjugated with the -electrons of the double bond, thus, resonance is not possible and hence no resonance hybrid will exist. -
On adding dilute H2 SO4 for testing halogens in an organic compound with AgNO3 white precipate of Ag2SO4 Mmay be mistaken for white precipate of chlorine as AgCI.Hence dilute HNO3 is used instead of dilute H2SO4.
