CBSE 11th Standard Chemistry Subject Organic Chemistry: Some Basic Principles and Techniques Ncert Exemplar 2 Mark Questions With Solution 2021
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CBSE 11th Standard Chemistry Subject Organic Chemistry: Some Basic Principles and Techniques Ncert Exemplar 2 Mark Questions With Solution 2021
11th Standard CBSE
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Reg.No. :
Chemistry
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Why is nitric acid added to sodium extract before adding silver nitrate for testing halogens?
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Draw the resonance structures for the following compounds. Show the electron shift using curved-arrow notation.
(a) C6H5OH
(b) C6H5NO2
(c) CH3CH = CHCHO
(d) C6H5-CHO
(e) C6H5-CH2
(f) CH3CH = CHCH2 -
Draw the resonance structures for the following compounds. Show the electron shift using curved-arrow notation.CH3CH = CHCHO
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Draw the resonance structures for the following compounds. Show the electron shift using curved-arrow notation.C6H5-CHO
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Draw the resonance structures for the following compounds. Show the electron shift using curved-arrow notation.C6H5-CH2
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CBSE 11th Standard Chemistry Subject Organic Chemistry: Some Basic Principles and Techniques Ncert Exemplar 2 Mark Questions With Solution 2021 Answer Keys
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sodium extract is boiled with nitric acid to decompose NaCN and Na2S if present.
\(\mathrm{NaCN}+\mathrm{HNO}_{3} \longrightarrow \mathrm{NaNO}_{3}+\mathrm{HCN} \uparrow\)
\(\mathrm{Na}_{2} \mathrm{~S}+2 \mathrm{HNO}_{3} \longrightarrow 2 \mathrm{NaNO}_{3}+\mathrm{H}_{2} \mathrm{~S} \uparrow\)
If cyanide and sulphide are not removed, they will react with AgNO3 and hence, will interfere with the silver nitrate test for halogens
\(\mathrm{NaCN}+\mathrm{AgNO}_{3} \longrightarrow \underset{\text { White ppt }}{\mathrm{AgCN}}+\mathrm{NaNO}_{3}\)
\(\mathrm{Na}_{2} \mathrm{~S}+2 \mathrm{AgNO}_{3} \longrightarrow \underset{\text { Black } \mathrm{ppt}}{\mathrm{Ag}_{2} \mathrm{~S}}+2 \mathrm{NaNO}_{3}\) -
(a)
(b)
(c)
(d)
(e)
(f)
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