Cannizaro's reaction is exhibited by :
HCHO
CH3CHO
CH3CH2CHO
CH3CH2CH2CHO
A.
HCHO
Aldehydes which do not contain any -hydrogen atom shows Cannizaro's reaction , eg , HCHO , C6H5CHO etc
Williamson's synthesis is used to prepare :
bakelite
PVC
acetone
diethyl ether
D.
diethyl ether
When sodium ethoxide react with ethyl bromide , it gives diethyl ether .
Na + Br CH3CH2OCH2CH3
This reaction is known as Williamson's synthesis .
CH3COOC2H5 with excess of C2H5MgBr and hydrolysis gives :
C2H5-C(CH3)=O
(C2H5)2-C(CH3)-OH
(CH3)2-C=O
(CH3)2-C(C2H5)-OH
B.
(C2H5)2-C(CH3)-OH
When esters react with excess of Grignard reagent , 3° alcohol is formed .
Which of the following can exhibit keto-enol tautomerism ?
H--H
(CH3)3C--H
CH3--H
CCl3--H
C.
CH3--H
Tautomerism is a special kind of functional isomerism in which the isomers exist in dynamic equilibrium with each other .It arises due to migration of hydrogen atom from one polyvalent atom to the other within the same molecule .The isomers thus obtained are called tautomers .
Thus , HCHO , CCl3CHO and (CH3)3CCHO do not show tautomerism due to the absence of hydrogen atom w.r.t carbonyl (2(-)C=O) group while CH3CHO shows tautomerism as
The IUPAC name for the formula :
is :
2-methyl-2-butenoic acid
3-methyl-3-butenoic acid
3-metyl-2-butenoic acid
2-methyl-3-butenoic acid
C.
3-metyl-2-butenoic acid
IUPAC name is 3-methyl-2-butenoic acid .
Glucose has following functional group :
aldehyde
aldehyde and alcohol
alcohol
ketone and alcohol
B.
aldehyde and alcohol
Structure of glucose is as
CHO-(CHOH)4-CH2OH
Hence , glucose contains both aldehyde and alcohol groups .
The increasing order of acidity is :
CHCl2COOH , CH2ClCOOH , CH3COOH
CH3COOH , CHCl2COOH , CH2ClCOOH
CH2BrCOOH , CH2ClCOOH , CH3COOH
CH2BrCOOH , CH2ClCOOH , CHCl2COOH
D.
CH2BrCOOH , CH2ClCOOH , CHCl2COOH
The acidity of halogen acids depends upon the number , nature and position of halogen atom .Greater the electron withdrawing influence of halogen atom , stronger will be the acid and atoms acidic strength also increases .Thus , the increasing order of acidity is :
CH2BrCOOH < CH2ClCOOH < CHCl2COCH
Chloroform , on exposing to air and sunlight produce :
chloropicrin
phosgene
carbon tetrachloride
benzene
B.
phosgene
Chlorofonn is oxidised to poisonous phosgene in the presence of air as :
CHCl3 + O2 + HCl
Therefore , chloroform is stored in dark coloured bottles to protect it from light .
Natural rubber is a polymer of :
cis-isoprene
trans-isoprene
co-cis and trans isoprene
None of the above
A.
cis-isoprene
Natural rubber is a polymer of cis-isoprene .
Invert sugar is a mixture of :
glucose and fructose
glucose and lactose
glucose and galactose
only glucose
A.
glucose and fructose
+ H2O +
Sucrose is dextrorotatory and the resulting solution is laevorotatory with specific rotation of -39.9° because fructose has a greater specific rotation .Since , there is a change in sign from dextrorotatory to laevorotatory , the reaction is called inversion reaction and thus , sucrose (obtained from glucose and fructose) is called invert sugar .