ORGANIC CHEMISTRY : SOME BASIC PRINCIPLES AND TECHNIQUES
One Mark QuestionsQ1 Suggest a method to purify a liquid which decomposes at its boiling point.
A 1 The process Distillation Under reduced pressure is used to purify a liquid which decomposes at its boiling point.
Q 2 How will you separate a mixture of O-nitrophenol and p- nitrophenol ?
Q 3 Lassaigne’s test is not shown by diazonium Salt. Why?
A 3 On heating diazonium Salts loses Nitrogen and could not fuse with the Sodium metal therefore diazonium Salt do not show Positive Lassaigne’s test for nitrogen.
Q 4 Alcohols are weaker acids than Water, Why ?
A 4 The alkyl group in alcohols has + I effect due to which electron density is increases on Oxygen atom which makes the release of hydrogen ion more difficult from alcohol.R → O →H
Q 5 Why is nitric acid is added to Sodium extract before adding Silver nitrate for testing halogens ?
A 5 Nitric acid is added to decompose NaCN and Na2S
NaCN + HNO3 → NaNO3 + HCN
Na2S + 2HNO3 → 2NaNO3 + H2S
Q 6 which of the two O2NCH2CH2-or CH3CH2O –is expected to be more stable and why ?
A 6 NO2group has –I effect and disperse the negative charge on Oxygen atom O2N ←CH2← CH2O-
Q 7 Arrange the following in increasing Order of Stability ;
(CH3)3C +, CH3CH2CH2C+H2, CH3CH2C+HCH3,CH3C+H2, CH3CH2C+H2A 7 CH3C+H2< CH3CH2C+H2< CH3CH2CH2C+H2<CH3CH2C+HCH3< (CH3)3C +
Q 8 Write the IUPAC name of the following
CH3 CH CH CH2 CH3
CH3CH3
A 8 2,3Dimethylpentane
Q 9 Write the hybridized state of C atoms in the following
CH2 = CH - C Ξ N
A 9 sp2sp2sp
CH2 = CH - C Ξ N
A 10 2,5Dimethylheptane
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