IISER Chemistry - Organic Chemistry Based on Functional Group - I
Exam Duration: 45 Mins Total Questions : 30
A compound X of formula C3H8O yields a ketone C3H6O on oxidation .To which of the following classes of compound could X belong?
- (a)
an aldehyde
- (b)
secondary alcohol
- (c)
alkene
- (d)
tertiary alcohol
When sodium is added to ethanol
- (a)
no action occurs
- (b)
only H2 gas is formed
- (c)
NaOC2H5 and O2 are formed
- (d)
NaOC2H5 and H2 are formed
Formation of diethyl ether from ethanol is based on a
- (a)
dehydrogenation reaction
- (b)
dehydration reaction
- (c)
oxidation reaction
- (d)
reduction reaction
When two halogen atoms are attached to the same carbon of alkane , the compound is called
- (a)
vicinal dihaloalkane
- (b)
geminal dihaloalkane
- (c)
halide of alkene
- (d)
dihalide of alkene
The compound which dehydrates most easily is
- (a)
R3COH
- (b)
R2CHOOH
- (c)
CH3CH2OH
- (d)
CH3CH2CH2OH
Which one of the following alcohols is least soluble in water?
- (a)
CH3OH
- (b)
C3H7OH
- (c)
C10H21OH
- (d)
C4H9OH
The order of reactivity of three types of alcohols in esterification is
- (a)
30>20>10
- (b)
30>10>20
- (c)
10>20>30
- (d)
same in the all cases
The compounds which reacts fastest with Lucas reagent at room temperature is
- (a)
butanol-1
- (b)
butanol -2
- (c)
2-mythyl propanol
- (d)
2-mythyl propanol-2
For a given alcohol the order of reactivity of halogen acids is
- (a)
HI>HBr
- (b)
HCL
- (c)
HCl
- (d)
HI
Which one is not the name for benzene hexa-chloride?
- (a)
666
- (b)
lindane
- (c)
malathion
- (d)
gammexane
Out of four compounds phenol,o-cresol,p-cresol and p-nitrophenol which is the strongest acid?
- (a)
phenol
- (b)
o-cresol
- (c)
p-cresol
- (d)
n-nitrophenol
Aspirin is
- (a)
acetyl salicylic acid
- (b)
4-ethoxy acetanilide
- (c)
N-acetyl -4-aminophenol
- (d)
NONE OF THE ABOVE
CHCl3 + NaOH + Compound A \(\rightarrow\) B.B has very unpleasant odour.A could be
- (a)
CH3NO2
- (b)
C6H5OH
- (c)
C6H5NH2
- (d)
CH3CONH2
Consider the following alcohols
(i)\(CH_3-CH_2CH_2CH_2COH_3\)
(ii)\(CH_3-CH_2-CHOH\ CH_3\)
(iii)\(CH_3-CH-OH-CH_3\\??\quad\quad\quad|\\\quad\quad\ \ CH_3\)
The order of increasing b.p. would be
- (a)
(i),(ii) and (iii)
- (b)
(iii),(ii) and (i)
- (c)
(ii),(iii) and (i)
- (d)
None of the three
Hydroboration - oxidation of propene yield
- (a)
CH3CH2CHO
- (b)
CH3CHOHCH3
- (c)
CH3CHOHCH2OH
- (d)
CH3CH2CH2OH
The order for the acidic strength of 1o, 2o, 3o alcohols, H2O and \(RC\equiv CH\) is
- (a)
\(RC\equiv CH>{ 3 }^{ o }>{ 2 }^{ o }>{ 1 }^{ o }>{ H }_{ 2 }O\)
- (b)
\({ 1 }^{ o }>{ 2 }^{ o }>{ 3 }^{ o }>{ H }_{ 2 }O>RC\equiv CH\)
- (c)
\({ H }_{ 2 }O>{ 1 }^{ o },{ 2 }^{ o },{ 3 }^{ o }>RC\equiv CH\)
- (d)
\({ 3 }^{ o }>{ 2 }^{ o }>{ 1 }^{ o }>{ H }_{ 2 }O>RC\equiv CH\)
The compound that will readily reacts with an electrophile is
- (a)
chlorobenzene
- (b)
benzene
- (c)
phenol
- (d)
toluene
The systematic name of PhCH2 COOH is
- (a)
2-phenylethanoic acid
- (b)
phenylmethanoic acid
- (c)
2-phenylmethanoic acid
- (d)
benzeneacetic acid
In which of the following, functional group isomerism is not possible?
- (a)
alcohols
- (b)
aldehydes
- (c)
alkyl halides
- (d)
yanides
The geometry of \(\overset { . }{ C } H_{ 3 }\) is
- (a)
pyramidal
- (b)
linear
- (c)
tetrahedral
- (d)
planar
Among the following compounds, the compound which does not show chain isomerism is
- (a)
C3H8
- (b)
C4H10
- (c)
C5H12O
- (d)
C5H10O
The compounds which can be interconverted through rotation around a single bond are called
- (a)
diastereomers
- (b)
conformers
- (c)
positional isomers
- (d)
enantiomers
The correct stability order of the following free radicals is
- (a)
\((CH_{ 3 })_{ 2 }\dot { C } H<(CH_{ 3 })_{ 3 }\dot { C } <(C_{ 6 }H_{ 6 })_{ 3 }\dot { C } <(C_{ 6 }H_{ 5 })_{ 2 }\dot { C } H\)
- (b)
\((C_{ 6 }H_{ 5 })_{ 2 }\dot { C } H<(C_{ 6 }H_{ 5 })_{ 3 }\dot { C } <(CH_{ 3 })_{ 3 }\dot { C } <(CH_{ 3 })_{ 2 }\dot { C } H\)
- (c)
\((C_{ 6 }H_{ 5 })_{ 3 }\dot { C } <(C_{ 6 }H_{ 5 })_{ 2 }\dot { C } H<(CH_{ 3 })_{ 3 }\dot { C } <(CH_{ 3 })_{ 2 }\dot { C } H\)
- (d)
\((CH_{ 3 })_{ 2 }\dot { C } H<(CH_{ 3 })_{ 3 }\dot { C } (C_{ 6 }H_{ 5 })_{ 2 }\dot { C } H<(C_{ 6 }H_{ 5 })_{ 3 }\dot { C } \)
Match the following and choose the correct option
| Column I | Column II |
|---|---|
| A.Carbocation | p. sp2-hybridised carbon with empty p-orbital |
| B.Isomers | q. Species that can supply a pair of electrons |
| C.Nucleophile | r.Cyclohexane and 1-hexene |
| D.sp-hybridisation | s.Ethyne |
- (a)
A B C D q p s r - (b)
A B C D p r s q - (c)
A B C D p r q s - (d)
A B C D p q r s
Consider thiol anion \((RS^{\ominus})\) and alkoxy anion \((RO^{\ominus})\). Which of the following statement is correct?
- (a)
\(RS^{\ominus}\) is less basic and less nucleophilic than \(RO^{\ominus}\)
- (b)
\(RS^{\ominus}\) is less basic but more nucleophilic than \(RO^{\ominus}\)
- (c)
\(RS^{\ominus}\) is more basic and more nucleophilic than \(RO^{\ominus}\)
- (d)
\(RS^{\ominus}\) is more basic but less nucleophilic than \(RO^{\ominus}\)
The correct order of increasing basicity of the given conjugate base (R=CH3) is
- (a)
\(RCO\overset { - }{ O }
- (b)
\(\overset { - }{ R }
- (c)
\(RCO\overset { - }{ O } <\overset { - }{ N } H_{ 2 }
- (d)
\(RCO\overset { - }{ O }
Consider the following reaction, \(PhOEt\xrightarrow[(ii)H_2o]{(i)BBr_3}\) Which of the statement is correct?
- (a)
The products are PhBr+EtOH+H3BO3
- (b)
The products are PhOH+EtBr+H3BO3
- (c)
The liberated Br- attacks Et displacing PhOBr2 that further hydrolysis to give desired products.
- (d)
The role played by BBr3 is similar to that played by in HI through the formation of a complex with ether
When ether comes in contact with air, it form peroxides that tested by the addition of Fe2+ ion and .... to the solution.Fill in the blank.
- (a)
KCN
- (b)
KCNS
- (c)
SnCl2
- (d)
HgCl2
Amongst the following alcohol, the alcohol that would react faster with conc. HCl and anhydrous ZnCl2 is
- (a)
2-butanol
- (b)
2-methyl propan-1-ol
- (c)
1-butanol
- (d)
2-methylbutanol-2-ol
From amongst the following alcohols the one that would react faster with conc. HCl and anhydrous ZnCl2 is
- (a)
2-butanol
- (b)
2-methylpropan-2-ol
- (c)
2-methylpropanol
- (d)
1-butanol
1654060945.png)
1654060942.png)
1653987551.png)
1653987086.png)
1582095229.jpg)
