Chemistry - Introduction to organic chemistry
Exam Duration: 45 Mins Total Questions : 30
Percentage of carbon is maximum in
- (a)
peat
- (b)
lignite
- (c)
bituminous
- (d)
anthracite
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
Number of isomers of nitrophenol,C6H4(OH)NO2 is
- (a)
0
- (b)
3
- (c)
4
- (d)
2
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
Which of the following compounds will show functional isomerism?
- (a)
CH3CH2CH2OH and CH3 CHOH-CH3
- (b)
C2H5NH2 and (CH3)2 NH
- (c)
CH3CH2OH and CH3-O-CH3
- (d)
CH3CH(CH3)2 and CH3CH2CH2CH3
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
Which of the following molecular formulae belongs to the acetylene series?
- (a)
C7H12
- (b)
C9H18
- (c)
C12H26
- (d)
C15H30
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 isomers must have the same
- (a)
structural formula
- (b)
molecular formula
- (c)
physical properties
- (d)
NONE OF THE ABOVE
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 isomers with the same molecular and structural formula are called
- (a)
optical isomers
- (b)
geometrical isomers
- (c)
stereo isomers
- (d)
tautomers
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
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
Which of the following statements is not correct about pairs of enantiomers?
- (a)
They have similar physical properties
- (b)
They have identical biological activities
- (c)
They have similar chemical properties towards chiral reagents
- (d)
Dextro from rotate plane polarised light to the right
In benzene molecule, in forming C-H bond, the s-orbital of hydrogen overlaps with
- (a)
pz-orbital of carbon
- (b)
sp-hybrid orbital of carbon
- (c)
sp2-hybrid oribital of carbon
- (d)
sp3-hybrid oribital of carbon
Number of \(\sigma \) -bonds in toluene would be
- (a)
8
- (b)
10
- (c)
12
- (d)
15
A similarity between optical and geometrical isomerism is that
- (a)
each forms equal number of isomers for a given compound
- (b)
if in a compound one is present then so is the other
- (c)
both are included in stereo isomerism
- (d)
they have no similarity
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
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
which one of the following is optically active?
- (a)
\(C{ H }_{ 3\quad \quad \quad }\quad CO-NH\quad \quad \quad\quad C{ H }_{ 3\quad \quad \quad }\quad \\ \quad \quad \diagdown \quad \quad \diagup \quad \quad \quad \quad \quad \diagdown \quad \quad \quad \diagup \\ \quad \quad \quad \quad C\quad \quad \quad \quad \quad \quad \quad \quad C\\ \quad \quad \diagup \quad \quad \diagdown \quad \quad \quad \quad \quad \diagup \quad \quad \diagdown \\ H\quad \quad \quad \quad \quad H-CO\quad \quad \quad \quad \quad H\)
- (b)
\(C{ H }_{ 3\quad \quad \quad }\quad CO-NH\quad \quad \quad \quad \quad H\\ \quad \quad \diagdown \quad \quad \diagup \quad \quad \quad \quad \quad \diagdown \quad \quad \quad \diagup \\ \quad \quad \quad \quad C\quad \quad \quad \quad \quad \quad \quad \quad C\\ \quad \quad \diagup \quad \quad \diagdown \quad \quad \quad \quad \quad \diagup \quad \quad \diagdown \\ H\quad \quad \quad \quad NH-CO\quad \quad \quad \quad \quad C{ H }_{ 3\quad \quad \quad }\)
- (c)
\(C{ H }_{ 3 }-C{ H }_{ 2 }-COOH\)
- (d)
\(\quad\quad COOH\\ \quad \quad \quad \quad |\\ \quad H-C-OH\\ \quad \quad \quad \quad |\\ \quad H-C-OH\\ \quad \quad \quad \quad |\\ \quad \quad COOH\\ \)