IISER Chemistry - Introduction to organic chemistry
Exam Duration: 45 Mins Total Questions : 30
When formic aid is heated with concentrated sulphuric acid the compound formed is
- (a)
CO
- (b)
CO2
- (c)
HCHO
- (d)
NONE OF THESE
The IUPAC name of the compound having the structure (CH3)3CCH=CH2 is
- (a)
3,3,3-Trimethy1 propene
- (b)
1,1,1-trimethy1 2-propene
- (c)
3, 3-dimethy1 1-butene
- (d)
2, 2-dimethy1 3-butene
Which of the following compounds displays geometrical isomerism?
- (a)
CH2=CHBr
- (b)
CH2=CBr2
- (c)
Cl CH=CH Cl
- (d)
Br2 C=C Cl2
The compounds \(C_2H_5OC_2H_5\)and \(CH_3OCH_2C_2H_5\) are
- (a)
enantiomers
- (b)
geometrical isomers
- (c)
metamers
- (d)
functional isomers
The IUPAC name of CH3CONH2 is
- (a)
propanone
- (b)
acetamide
- (c)
ethanamide
- (d)
propionamide
The correct IUPAC name of \(C{ H }_{ 3 }-C{ H }_{ 2 }-C\equiv CH=C{ H }_{ 2 }\) is
- (a)
3-hexyne-5-ene
- (b)
5-hexyne-3-yne
- (c)
3-hexyne-1-ene
- (d)
1-hexene-3-yne
The IUPAC name for CH3-CH2COCH2-COCOOH is
- (a)
2,4 dioxo-hexanoic acid
- (b)
propiony1 capronic acid
- (c)
\(\alpha ,\gamma \) dioxo-capronic acid
- (d)
hexane dione-2, 4 ic-1-oic
The structure of benzene is best represented as a resonance hybrid of
- (a)
two equivalent structures
- (b)
three equivalent structures
- (c)
four equivalent structures
- (d)
six equivalent structures
What is the number of possible alkynes with the molecular formula C5H8?
- (a)
2
- (b)
3
- (c)
4
- (d)
5
The IUPAC name of the compound represented by the formula \(C{ H }_{ 3 }-CH-C{ H }_{ 2 }=C{ H }_{ 2 }\\ \quad \quad \quad \quad |\\ \quad \quad \quad \quad C{ H }_{ 3 }\) is
- (a)
3-methy1-1-butene
- (b)
1-hexene
- (c)
4-methy1pentene
- (d)
4-methy1-1-pentene
The correct chemical name for\(C{ H }_{ 3 }-CH-C{ H }_{ 3 }\\ \quad \quad \quad \quad |\\ \quad \quad \quad \quad C{ H }_{ 3 }\) would be
- (a)
butane
- (b)
2-methy1-propane
- (c)
isopropy1 methane
- (d)
dimethy1 ethane
The type of isomerism not found in alkenes is
- (a)
geometrical isomerism
- (b)
position isomerism
- (c)
chain isomerism
- (d)
mesomerism
Isomers of a substance must have the same
- (a)
structural formula
- (b)
chemical properties
- (c)
molecular mass
- (d)
physical properties
Which one of the following structures will exhibit cistrans isomerism?
- (a)
CH2Br-CH2Br
- (b)
CBr3-CH3
- (c)
CHBr=CHBr
- (d)
CBr2=CH2
The number of isomerism open chain hydrocarbons with molecular formula C5H10 is
- (a)
3
- (b)
4
- (c)
5
- (d)
6
Which one of the following pairs of isomers is not metamers?
- (a)
CH3-O-C3H7 and C2H5-O-C2H5
- (b)
C2H5CH(OH)CH3 and C2H5-O-C2H5
- (c)
CH3-O-C3H7 and C2H5-O-C2H5
- (d)
(CH3)3 COH and CH3-CHO CH2-CH3
The number of isomeric open chain hydrocarbons (structural isomers) with molecular formula C4H8 is
- (a)
2
- (b)
3
- (c)
4
- (d)
6
In which one of the following compounds, the oxidation number of carbon is zero?
- (a)
CH4
- (b)
CO2
- (c)
HCHO
- (d)
CH3OH
Which one of the following cycloalkanes is least stable?
- (a)
cyclopropane
- (b)
cyclobutane
- (c)
cyclopentane
- (d)
cyclohexane
The IUPAC name of CH2=CH-CHCl is
- (a)
ally1 chloride
- (b)
1-chloro 3 propene
- (c)
2-chloro-1-propene
- (d)
3 chloro propene
Number of \(\sigma \) -bonds in toluene would be
- (a)
8
- (b)
10
- (c)
12
- (d)
15
Which of the following does not show geometrical isomerism?
- (a)
1, 2-dichloro-1-pentene
- (b)
1, 3-dichloro-2-pentene
- (c)
1, 1-dichloro-1-pentene
- (d)
1, 4-dichloro-2-pentene
In the given heptane \({ ^{ 1 } }C{ H }_{ 3 }-{ ^{ 2 } }C{ H }_{ 2 }-{ ^{ 3 } }C{ H }_{ 2 }-{ ^{ 4 } }C{ H }_{ 2 }-{ ^{ 5 } }C{ H }_{ 2 }-{ ^{ 6 } }C{ H }_{ 2 }-{ ^{ 7 } }C{ H }_{ 3 },\) if one hydrogen is substituted by -OH group to give an optically active alcohol, the substitution should be done at carbon numbered
- (a)
1
- (b)
3
- (c)
4
- (d)
7
IUPAC nomenclature for
\({ CH }_{ 3 }-\begin{matrix} \underset { | }{ H } \\ C- \\ \overset { | }{ OH } \end{matrix}{ CH }_{ 2 }-{ CH }_{ 2 }-\overset { \underset { | }{ Br } }{ CH } -\overset { \underset { | }{ { CH }_{ 3 } } }{ \underset { \quad \overset { | }{ { CH }_{ 3 } } }{ C } } -{ CH }_{ 3 }\)
- (a)
6,6 dimethyl- 5 -bromo heptane - 2-ol
- (b)
1- t - butyl -1-bromo-3-hydroxy pentane
- (c)
2-2-dimethyl-3-bromo heptain 6-ol
- (d)
5-t-butyl-5-bromo-2-hydroxy pentane
The substance represented by the formulae
\(\quad\quad COOH\\ \quad \quad \quad \quad |\\ { H }_{ 2 }N-C-H\\ \quad \quad \quad \quad |\\ H\quad -C-\quad OH\\ \quad \quad \quad \quad |\\ \quad \quad \quad C{ H }_{ 3 }\) and \(\quad\quad\quad COOH\\ \quad \quad \quad \quad |\\ { H }-\quad C \quad -N{ H }_{ 2 }\\ \quad \quad \quad \quad |\\ HO-\quad C-H\\ \quad \quad \quad \quad |\\ \quad \quad \quad C{ H }_{ 3 }\)
- (a)
are enantiomers
- (b)
are geometric isomers
- (c)
are conformational isomers
- (d)
are identical molecules
The compounds are example of
\({ C }_{ 6 }{ H }_{ 5 }\quad \quad \quad \quad H\\ \quad \quad \diagdown \quad \quad \quad \diagup \quad \quad \quad \quad \\ \quad \quad \quad C=C\\ \quad \quad \diagup \quad \quad \quad \diagdown \\ \quad H\quad \quad \quad \quad COOH\)and \({ C }_{ 6 }{ H }_{ 5 }\quad \quad\quad COOH\\ \quad \quad \diagdown \quad \quad \quad \diagup \quad \quad \quad \quad \\ \quad \quad \quad C=C\\ \quad \quad \diagup \quad \quad \quad \diagdown \\ \quad H\quad \quad \quad \quad \quad H\)
- (a)
Optical isomers
- (b)
enantiomers
- (c)
metamers
- (d)
geometrical isomers
The IUPAC name for the following is
\(\quad\quad\quad\quad OH\quad \quad \quad \quad \quad\quad OH\\ \quad \quad \quad \quad \quad |\quad \quad \quad \quad \quad \quad \quad |\\ C{ H }_{ 3 }-CH-C{ H }_{ 2 }-CH-C{ H }_{ 3\\ \\ }\\ \quad \quad \quad \quad \quad |\\ \quad \quad \quad \quad C{ H }_{ 3 }\\ \quad \quad \quad \quad \)
- (a)
1,1-dimethyl 1-1 , 3 butanediol
- (b)
2- methyl -2 , 4 pentanediol
- (c)
4-methyl -2,4 pentanediol
- (d)
1,3,3-trimethyl -1,3 propanediol
Which of the following compounds will show geometrical isomerism
- (a)
\(C{ H }_{ 3 }\quad \quad \quad C{ H }_{ 3 }\quad \\ \quad \quad \diagdown \quad \quad \diagup \quad \\ \quad \quad C=C\\ \quad \quad \diagup \quad \quad \diagdown \\ C{ H }_{ 3 }\quad \quad \quad H\)
- (b)
\(C{ H }_{ 3 }\quad \quad \quad C{ H }_{ 3 }\quad \\ \quad \quad \diagdown \quad \quad \diagup \quad \\ \quad \quad C=C\\ \quad \quad \diagup \quad \quad \diagdown \\ C{ H }_{ 3 }\quad \quad\quad\quad C{ H }_{ 3 }\)
- (c)
\(C{ H }_{ 3 }\quad \quad \quad C{ H }_{ 3 }\quad \\ \quad \quad \diagdown \quad \quad \diagup \quad \\ \quad \quad C=C\\ \quad \quad \diagup \quad \quad \diagdown \\ H\quad \quad \quad \quad \quad H\)
- (d)
\(C{ H }_{ 3 }\quad \quad \quad C{ H }_{ 3 }\quad \\ \quad \quad \diagdown \quad \quad \diagup \quad \\ \quad \quad C=C\\ \quad \quad \diagup \quad \quad \diagdown \\ H\quad \quad \quad \quad \quad H\)
How many primary carbons atoms are there in the compound?
\(\quad\quad\quad H\quad \quad \quad \quad C{ H }_{ 3 }\\ \quad \quad \quad |\quad \quad \quad \quad \quad \quad |\\ C{ H }_{ 3 }-C-C{ H }_{ 2 }-C-C{ H }_{ 3 }\\ \quad \quad \quad \quad |\quad \quad \quad \quad \quad \quad |\\ \quad \quad \quad C{ H }_{ 3 }\quad \quad\quad C{ H }_{ 3 }\)
- (a)
3
- (b)
4
- (c)
5
- (d)
6
The correct basic strength amongst the following compounds is
- (a)
I >II > III >IV
- (b)
I <IV <III <II
- (c)
IV < I <III <II
- (d)
III < IV <II < I