Chemistry - Some Important points and important questions on organic chemistry
Exam Duration: 45 Mins Total Questions : 30
The substance which has been asaigned octane number of -45 is
- (a)
n -octane
- (b)
n -heptane
- (c)
n -nonane
- (d)
None
Which branched chain isomer of the hydrocarbon with molecular mass 72 give only one isomer of mono substituted alky1 halide?
- (a)
neopentane
- (b)
isohexane
- (c)
neohexane
- (d)
tertiany buty1 chloride
The 1996 Nobel Prize in chemistry goes to
- (a)
F. Curl
- (b)
H.W. Kroto
- (c)
E.Smalley
- (d)
jointly to the above three persons
Which alkyl halide has maximum density?
- (a)
C3H7I
- (b)
C2H5I
- (c)
CH3 I
- (d)
CH3Br
On treating phenol with PC15 the main product is
- (a)
chlorobenzene
- (b)
triphenyl phosphate
- (c)
hexachlorobenzane
- (d)
BHC
Arrange the following compounds in order of increasing dipole moment : Toluene (1); m-dichlorobenzene (II); o-dichlorobenzene (III); and p-dichlorobenzene (IV).
- (a)
I < IV< II< III
- (b)
IV< I < II < III
- (c)
IV < I < III < II
- (d)
IV< II < I < III
Which of the following compounds does not react with metalic sodium?
- (a)
CH3CH(OH)Ch3
- (b)
CH3-O-CH3
- (c)
CH3COOH
- (d)
C2H5OH
Which of the following will react with water?
- (a)
CHCL3
- (b)
CCL3CHO
- (c)
CCL4
- (d)
CLCH2-CH2-Cl
The regent used to convert ethanoic acid to ethanol is
- (a)
LiAlH4
- (b)
BH3
- (c)
PCl3
- (d)
K2Cr2O7/H+
Ice-cold hydrochloric acid is added to dimethyl ether the product formed is
- (a)
dymethoxy methane
- (b)
dymethyl oxinium chloride
- (c)
methyl chloride
- (d)
methanol and methyl chloride
Compound 'A' C5H10O forms a phenyl hydrazone and gives a negative Tollen's reagent test and iodoform test. on reduction with Zn-Hg/HCl, compound 'A' is gives n-pentane. the compound 'A' is
- (a)
Primary alcohol
- (b)
aldehyde
- (c)
secondary alcohal
- (d)
ketone
In fischer-spier easterification reaction, the order of reactivity of the alcohols follows the sequence
- (a)
\(CH_{ 3 }OH>CH_{ 3 }CH_{ 2 }OH>\left( CH_{ 3 } \right) _{ 2 }>\left( CH_{ 3 } \right) _{ 3 }COH\)
- (b)
\((CH_{ 3 })_{ 3 }COH>(CH_{ 3 })_{ 2 }CHOH>CH_{ 3 }COH\)
- (c)
\(\left( CH_{ 3 } \right) _{ 2 }CHOH>(CH_{ 3 })_{ 3 }COH>CH_{ 3 }OH>CH_{ 3 }CH_{ 2 }OH\)
- (d)
None of these
When glycerol is heated with KHSO4 or ZnCl2 or H2SO4 the product formed is
- (a)
formaldehyde
- (b)
acetaldehyde
- (c)
acrolein
- (d)
None of these
Glycerol when heated with oxalic acid at 383 K gives
- (a)
formic acid
- (b)
acetic acid
- (c)
alyl alcohal
- (d)
None of these
When ethyl alcohol reacts with diazomethane(CH2N2)in presence of HBF4, th eproduct formed would be
- (a)
Methyl ethyl ether and N2
- (b)
Diethyl ethre and N2
- (c)
methyl alcohol and methyl amine
- (d)
None of the above
2,4 dinitrophenyl hydrazine is called
- (a)
Tollens reagent
- (b)
Bayer's regent
- (c)
Brady's reagent
- (d)
Fehling's solution
By the Hydrolysis of 1,1,1-trichloro ethane the product formed is
- (a)
formic acid
- (b)
oxalic acid
- (c)
acitic acid
- (d)
None of the above
methyl magnesium bromide reacts with cyanogen chloride to give
- (a)
Acetonitrile
- (b)
ethane nitrile
- (c)
methyl cyanide
- (d)
All of the above
methyl isocyanide on acid hydrolysis gives
- (a)
acetic acid + NH3
- (b)
methyle amine and formic acid
- (c)
acetic acid and formic acid
- (d)
None is correct
Among the given compounds, the most suscribable to nucleophilic attack at the carbonyl group is
- (a)
MeCOCL
- (b)
MeCHO
- (c)
MeCOOMe
- (d)
MeCOOCOMe
C6H6 \(\overset { [0] }{ \underset { { V }_{ 2 }{ O }_{ 5 } }{ \longrightarrow } } \) X . Here X is
- (a)
maleic anhydride
- (b)
acetic acid
- (c)
propanoic acid
- (d)
succinic acid
Which one of the following reagents would not yield alkane?
- (a)
\({ C }_{ 2 }{ H }_{ 5 }OH\quad \overset { HI/Red\ P }{ \underset { { 150 }^{ 0 }C }{\longrightarrow } } \)
- (b)
refluxing butanoic with Zn/Hg-HCl
- (c)
hydrolysis of ethyne
- (d)
electrolysis of sodium proponate solution
C2H5Br \(\overset { AgCN }{ \longrightarrow } \quad X\quad \overset { Reduction }{ \underset { Zn/Hg-HCl }{ \longrightarrow } } \quad Y\) , Y is
- (a)
n-propylamine
- (b)
ethylamine
- (c)
isopropylamine
- (d)
ethylmethylamine
Identify Z in the series
\(C_3H_7OH\xrightarrow[160°-180°C]{conc.H_2SO_4}X\xrightarrow{Br_2}Y\xrightarrow[alc.KOH]{Excess of}Z\)
- (a)
\(CH_3-CH-CH_2\\\quad\quad\quad\ |\ \ \quad\quad|\\\quad \quad \quad NH_2\ \ \ NH_2\)
- (b)
\(CH_3-CH-CH_2\\\quad\quad\quad\ |\quad\quad\ \ |\\\quad\quad\quad OH\quad\ OH\)
- (c)
\(CH_3-C=CH_2\\\quad\quad\quad\ |\\\quad\quad\quad\ OH\)
- (d)
\(CH_3-C\equiv CN\)