CLASS
XI A & B
CHEMISTRY
HOME
WORK 23/01/2017
ORGANIC
CHEMISTRY SOME BASIC CONCEPTS
1.
What is the hybridization state of each carbon atom in the following
compounds?
CH2=C=O , CH3 CH = CH2 , (CH3)
2 CO , CH2 = CH CN , C6 H6
2.
Write the bond line formulas
for :
isopropyl alcohol, 2,3-Dimethyl
butanal,Heptan-4-one.
3.
Draw the formulas for the first
five members of each homologous series beginning with the following compounds.
(a) H-COOH (b) CH3COCH3 (c) H-CH = CH2
4.
Draw the resonance structures
of the following compounds . Show the electron shift using curved arrow
notation
(a) C6H5OH
(b) C6H5NO2 (c) CH3 CH = CH CHO (d)
C6H5CHO.
5.
Explain the terms Inductive and
electromeric effects.Which electron displacement effect explains the following
correct orders of acidity of the carboxylic acids?
(a)
Cl3 CCOOH > Cl2CH
COOH > ClCH2COOH
(b)
CH3 CH2
COOH > (CH3)2 CH COOH > (CH3)3
C COOH
6.
Give a brief description of the
principles of the following techniques taking an example in each case.
(a)
Crystallization (b) Distillation (c) Chromatography
7.
A sample of organic compound
contains 69% C, 4.8% H and the remaining
oxygen. Calculate the masses of CO2 and water produced when
0.20 g of this substance is subjected to
complete combustion.
8.
0.3780 g of an organic chloro
compound gave 0.5740 g of silver chloride in Carius method. Calculate the
percentage of chlorine present in the compound.
9.
In the estimation of S by
carius method 0.468 g of an organic sulphur compound afforded 0.668 g of barium
sulphate . Find out the percentage of S in the compound.
10.
Which of the following
carbocation is most stable?
(a)
(CH3)3 C
C+H2 (b) (CH3)3
C+ (c) CH3 CH2
CH2+ (d) CH3C+H CH2 CH3
11.
Explain hyperconjugation effect
with example.
12.
Describe Lassaigne’s test for
halogens, nitrogen and sulphur
No comments:
Post a Comment
Note: only a member of this blog may post a comment.