11242 + Mcqs in Chemistry Page 103 McqOptions

5101.	The structure of \[{{H}_{2}}{{O}_{2}}\] is [CBSE PMT 1999; AFMC 2003]
A.	Planar
B.	Non-planar
C.	Spherical
D.	Linear
Answer» C. Spherical

Discussion

5102.	The hybrid orbitals used by central atoms in \[BeC{{l}_{2}},\,\,BC{{l}_{3}}\] and \[CC{{l}_{4}}\] molecules are respectively [MP PMT 1999]
A.	\[s{{p}^{2}},\,\,s{{p}^{3}}\] and \[sp\]
B.	\[s{{p}^{{}}},\,\,s{{p}^{2}}\] and \[s{{p}^{3}}\]
C.	\[s{{p}^{2}},\,\,s{{p}^{3}}\] and \[s{{p}^{2}}\]
D.	\[s{{p}^{2}},\,\,sp\] and \[s{{p}^{3}}\]
Answer» C. \[s{{p}^{2}},\,\,s{{p}^{3}}\] and \[s{{p}^{2}}\]

Discussion

5103.	\[s{{p}^{3}}\] hybridization leads to which shape of the molecule [MP PET/PMT 1998]
A.	Tetrahedron
B.	Octahedron
C.	Linear
D.	Plane triangle
Answer» B. Octahedron

Discussion

5104.	As the \[p-\]character increases, the bond angle in hybrid orbitals formed by \[s\] and atomic orbitals [MP PMT 1997]
A.	Decreases
B.	Increases
C.	Doubles
D.	Remains unchanged
Answer» B. Increases

Discussion

5105.	Out of the following hybrid orbitals, the one which forms the bond at angle\[{{120}^{o}}\], is [MP PMT 1997]
A.	\[{{d}^{2}}s{{p}^{3}}\]
B.	\[s{{p}^{3}}\]
C.	\[s{{p}^{2}}\]
D.	\[sp\]
Answer» D. \[sp\]

Discussion

5106.	In benzene molecule all \[C-C\] bond lengths are equal because
A.	All carbon atoms are equivalent
B.	All carbon atoms are \[s{{p}^{2}}\] hybridised
C.	All \[C-C\] bonds in benzene, have same order
D.	All \[C-C\] bonds are single covalent bond
Answer» D. All \[C-C\] bonds are single covalent bond

Discussion

5107.	The shapes of \[BC{{l}_{3}},\,\,PC{{l}_{3}}\]and \[IC{{l}_{3}}\]molecules are all
A.	Triangular
B.	Pyramidal
C.	\[T-\]shaped
D.	All above are incorrect
Answer» B. Pyramidal

Discussion

5108.	The geometry of sulphur trioxide molecule is
A.	Tetrahedral
B.	Trigonal planar
C.	Pyramidal
D.	Square planar
Answer» C. Pyramidal

Discussion

5109.	The \[PC{{l}_{5}}\] molecule is a result of the hybridisation of [MP PET 1995; DCE 2000; MP PMT 2002]
A.	\[s{{p}^{2}}{{d}^{2}}\]
B.	\[s{{p}^{3}}d\]
C.	\[sp{{d}^{3}}\]
D.	\[s{{p}^{2}}{{d}^{3}}\]
Answer» C. \[sp{{d}^{3}}\]

Discussion

5110.	Which of the following hybridisation has maximum s-characters [MP PET 1995]
A.	\[s{{p}^{3}}\]
B.	\[s{{p}^{2}}\]
C.	\[sp\]
D.	None of these
Answer» D. None of these

Discussion

5111.	The structure of \[P{{F}_{5}}\]molecule is [AFMC 1995; JIPMER 2001]
A.	Tetrahedral
B.	Trigonal bipyramidal
C.	Square planar
D.	Pentagonal bipyramidal
Answer» C. Square planar

Discussion

5112.	The correct order of the \[O-O\] bond length in \[{{O}_{2}},\,\,{{H}_{2}}{{O}_{2}}\] and \[{{O}_{3}}\] is [CBSE PMT 1995]
A.	\[{{O}_{2}}>{{O}_{3}}>{{H}_{2}}{{O}_{2}}\]
B.	\[{{O}_{3}}>{{H}_{2}}{{O}_{2}}>{{O}_{2}}\]
C.	\[{{H}_{2}}{{O}_{2}}>{{O}_{3}}>{{O}_{2}}\]
D.	\[{{O}_{2}}>{{H}_{2}}{{O}_{2}}>{{O}_{3}}\]
Answer» D. \[{{O}_{2}}>{{H}_{2}}{{O}_{2}}>{{O}_{3}}\]

Discussion

5113.	A \[s{{p}^{3}}\] hybridized orbital contains [DPMT 1984; BHU 1985; CPMT 1976]
A.	\[\frac{1}{4}s-\]character
B.	\[\frac{1}{2}s-\]character
C.	\[\frac{2}{3}s-\]character
D.	\[\frac{3}{4}s-\]character
Answer» B. \[\frac{1}{2}s-\]character

Discussion

5114.	In the compound \[C{{H}_{3}}OCl,\] which type of orbitals have been used by the circled carbon in bond formation [MP PET 1994]
A.	\[s{{p}^{3}}valuva\]
B.	\[s{{p}^{2}}\]
C.	\[sp\]
D.	p
Answer» C. \[sp\]

Discussion

5115.	The two types of bonds present in \[{{B}_{2}}{{H}_{6}}\] are covalent and [IIT 1994]
A.	Three centre bond
B.	Hydrogen bond
C.	Two centre bond
D.	None of the above
Answer» B. Hydrogen bond

Discussion

5116.	s-character in \[sp\]hybridised orbitals are
A.	\[\frac{1}{3}\]
B.	\[\frac{1}{2}\]
C.	\[\frac{1}{4}\]
D.	\[\frac{2}{3}\]
Answer» C. \[\frac{1}{4}\]

Discussion

5117.	The number of shared pairs of electrons in propane is [BHU 1981]
A.	2
B.	4
C.	6
D.	10
Answer» E.

Discussion

5118.	In diborane, the \[H-B-H\]bond angle is \[{{120}^{o}}\]. The hybridization of boron is likely to be [BHU 1981; CBSE PMT 1999]
A.	\[sp\]
B.	\[s{{p}^{2}}\]
C.	\[s{{p}^{3}}\]
D.	\[ds{{p}^{2}}\]
Answer» D. \[ds{{p}^{2}}\]

Discussion

5119.	The compound in which \[{{C}^{*}}\] uses \[s{{p}^{3}}\]hybrids for bond formation is [IIT 1989]
A.	\[H\overset{+}{\mathop{C}}\,OOH\]
B.	\[{{(N{{H}_{2}})}_{2}}\overset{+}{\mathop{C}}\,O\]
C.	\[{{(N{{H}_{3}})}_{3}}\overset{+}{\mathop{C}}\,OH\]\[HgC{{l}_{2}}\]
D.	\[C{{H}_{3}}\overset{+}{\mathop{C}}\,HO\]
Answer» D. \[C{{H}_{3}}\overset{+}{\mathop{C}}\,HO\]

Discussion

5120.	The hybridization of carbon atoms in \[C-C\] single bond of \[HC\equiv C-CH=C{{H}_{2}}\] is [IIT 1991; MP PET 1995]
A.	\[s{{p}^{3}}-s{{p}^{3}}\]
B.	\[s{{p}^{2}}-s{{p}^{3}}\]
C.	\[sp-s{{p}^{2}}\]
D.	\[s{{p}^{3}}-sp\]
Answer» D. \[s{{p}^{3}}-sp\]

Discussion

5121.	In \[\left[ Cu\,{{\left( N{{H}_{3}} \right)}_{4}} \right]\,S{{O}_{4}},\,\,;\,Cu\] has following hybridization [AIIMS 1988; UPSEAT 2001]
A.	\[ds{{p}^{2}}\]
B.	\[s{{p}^{3}}\]
C.	\[s{{p}^{2}}\]
D.	\[s{{p}^{3}}{{d}^{2}}\]
Answer» B. \[s{{p}^{3}}\]

Discussion

5122.	Carbon atoms in diamond are bonded to each other in a configuration [CPMT 1981]
A.	Tetrahedral
B.	Planar
C.	Linear
D.	Octahedral
Answer» B. Planar

Discussion

5123.	Which of the following molecules has trigonal planer geometry [CBSE PMT 2005]
A.	\[I{{F}_{3}}\]
B.	\[PC{{l}_{3}}\]
C.	\[N{{H}_{3}}\]
D.	\[B{{F}_{3}}\]
Answer» E.

Discussion

5124.	The species in which the central atom uses \[s{{p}^{2}}\]hybrid orbitals in its bonding is [IIT 1988]
A.	\[P{{H}_{3}}\]
B.	\[N{{H}_{3}}\]
C.	\[{{H}_{3}}{{C}^{+}}\]
D.	\[Sb{{H}_{3}}\]
Answer» D. \[Sb{{H}_{3}}\]

Discussion

5125.	In methane the bond angle is [AMU 1983]
A.	\[{{180}^{o}}\]
B.	\[{{90}^{o}}\]
C.	\[{{120}^{o}}\]
D.	\[{{109}^{o}}\]
Answer» E.

Discussion

5126.	Among the following compounds which is planar in shape [AMU 1992]
A.	Methane
B.	Acetylene
C.	Benzene
D.	Isobutene
Answer» D. Isobutene

Discussion

5127.	The two carbon atoms in acetylene are [AMU 1984; MADT Bihar 1982]
A.	\[s{{p}^{3}}\]hybridized
B.	\[s{{p}^{2}}\]hybridized
C.	\[sp\]hybridized
D.	Unhybridized
Answer» D. Unhybridized

Discussion

5128.	Acetate ion contains [AMU 1983]
A.	One \[C,\,\,O\]single bond and one \[C,\,\,O\] double bond
B.	Two \[C,\,\,O\] single bonds
C.	Two \[C,\,\,O\]double bonds
D.	None of the above
Answer» B. Two \[C,\,\,O\] single bonds

Discussion

5129.	The structural formula of a compound is \[C{{H}_{3}}-CH=C=C{{H}_{2}}.\] The type of hybridization at the four carbons from left to right are [CBSE PMT 1989]
A.	\[s{{p}^{2}},\,\,sp,\,\,s{{p}^{2}},\,\,s{{p}^{3}}\]
B.	\[s{{p}^{2}},\,\,s{{p}^{3}},\,\,s{{p}^{2}},\,\,sp\]
C.	\[s{{p}^{3}},\,\,s{{p}^{2}},\,\,sp,\,\,s{{p}^{2}}\]
D.	\[s{{p}^{3}},\,\,s{{p}^{2}},\,\,s{{p}^{2}},\,\,s{{p}^{2}}\]
Answer» D. \[s{{p}^{3}},\,\,s{{p}^{2}},\,\,s{{p}^{2}},\,\,s{{p}^{2}}\]

Discussion

5130.	Number of shared electrons in between carbon-carbon atoms in ethylene molecule is [MADT Bihar 1983]
A.	2
B.	4
C.	6
D.	3
Answer» C. 6

Discussion

5131.	In ethene, the bond angle(s) is/are [CPMT 1976; AMU 1984; MP PMT 1985]
A.	\[{{109}^{o}}28'\]
B.	\[{{120}^{o}}\]
C.	\[{{180}^{o}}\]
D.	Different
Answer» C. \[{{180}^{o}}\]

Discussion

5132.	Which molecule is linear [MP PMT 1984; IIT 1982, 88; EAMCET 1993; CBSE PMT 1992; MP PET 1995; RPMT 1997]
A.	\[N{{O}_{2}}\]
B.	\[Cl{{O}_{2}}\]
C.	\[C{{O}_{2}}\]
D.	\[{{H}_{2}}S\]
Answer» D. \[{{H}_{2}}S\]

Discussion

5133.	Which one of the following compounds has bond angle as nearly \[{{90}^{o}}\] [MP PMT 1985]
A.	\[N{{H}_{3}}\]
B.	\[{{H}_{2}}S\]
C.	\[{{H}_{2}}O\]
D.	\[C{{H}_{4}}\]
Answer» C. \[{{H}_{2}}O\]

Discussion

5134.	The nature of hybridization in the \[BC{{l}_{3}}\] molecule is [EAMCET 1982]
A.	\[sp\]
B.	\[s{{p}^{2}}\]
C.	\[s{{p}^{3}}\]
D.	\[s{{p}^{3}}d\]
Answer» D. \[s{{p}^{3}}d\]

Discussion

5135.	When two pairs of electrons are shared, bond is [MNR 1979]
A.	Single covalent bond
B.	Double covalent bond
C.	Dative bond
D.	Triple bond
Answer» C. Dative bond

Discussion

5136.	The bond angle in carbon tetrachloride is approximately [MNR 1981; MP PMT 1987]
A.	\[{{90}^{o}}\]
B.	\[{{109}^{o}}\]
C.	\[{{120}^{o}}\]
D.	\[{{180}^{o}}\]
Answer» C. \[{{120}^{o}}\]

Discussion

5137.	In the following molecule, the two carbon atoms marked by asterisk () possess the following type of hybridized orbitals \[{{H}_{3}}C-{{C}^{}}\equiv {{C}^{*}}-C{{H}_{3}}\] [NCERT 1984]
A.	\[s{{p}^{3}}\]orbital
B.	\[s{{p}^{2}}\]orbital
C.	\[sp\]orbital
D.	\[s\]orbital
Answer» D. \[s\]orbital

Discussion

5138.	The number of unpaired electrons in \[{{O}_{2}}\] molecule is [MNR 1983; Kerala PET 2002]
A.	0
B.	1
C.	2
D.	3
Answer» D. 3

Discussion

5139.	The compound 1, 2-butadiene has [IIT 1983; MP PMT 1996]
A.	Only \[sp\]hybridized carbon atoms
B.	Only \[s{{p}^{2}}\]hybridized carbon atoms
C.	Both \[sp\]and \[s{{p}^{2}}\]hybridized carbon atoms
D.	\[sp,\,\,s{{p}^{2}}\] and \[s{{p}^{3}}\]hybridized carbon atoms
Answer» E.

Discussion

5140.	As compared to pure atomic orbitals, hybrid orbitals have
A.	Low energy
B.	Same energy
C.	High energy
D.	None of these
Answer» B. Same energy

Discussion

5141.	Which species do not have \[s{{p}^{3}}\]hybridization [DPMT 1985]
A.	Ammonia
B.	Methane
C.	Water
D.	Carbon dioxide
Answer» E.

Discussion

5142.	Experiment shows that \[{{H}_{2}}O\]has a dipole moment while \[C{{O}_{2}}\] has not. Point out the structures which best illustrate these facts [DPMT 1984; NCERT 1983; CPMT 1984]
A.
B.	\[O=C=O\,;\,\,\,H-O-H\]
C.
D.	\[\underset{\underset{C=O\,;}{\mathop{\|\|\,\,\,\,\,\,\,\,\,\,}}\,}{\mathop{O\,\,\,\,\,\,\,}}\,\,\,\,\underset{\underset{O-H}{\mathop{\|\,\,\,\,\,\,\,\,\,\,\,\,\,}}\,}{\mathop{H\,\,\,\,\,\,\,}}\,\]
Answer» B. \[O=C=O\,;\,\,\,H-O-H\]

Discussion

5143.	The central atom in a molecule is in \[s{{p}^{2}}\]hybrid state. The shape of molecule will be [MP PMT 1987; CBSE PMT 1989]
A.	Pyramidal
B.	Tetrahedral
C.	Octahedral
D.	Trigonal planar
Answer» E.

Discussion

5144.	The hybridization of \[Ag\] in the linear complex \[{{\left[ Ag\,{{\left( N{{H}_{3}} \right)}_{2}} \right]}^{+}}\] is [CPMT 1985; BHU 1981]
A.	\[ds{{p}^{2}}\]
B.	\[sp\]
C.	\[s{{p}^{2}}\]
D.	\[CC{{l}_{4}}\]
Answer» C. \[s{{p}^{2}}\]

Discussion

5145.	Which has the shortest \[C-C\] bond length [NCERT 1982; CPMT 1989]
A.	\[{{C}_{2}}{{H}_{5}}OH\]
B.	\[{{C}_{2}}{{H}_{6}}\]
C.	\[{{C}_{2}}{{H}_{2}}\]
D.	\[{{C}_{2}}{{H}_{4}}\]
Answer» D. \[{{C}_{2}}{{H}_{4}}\]

Discussion

5146.	In \[HCHO,\,\,'C'\] has hybridization [AIIMS 1987]
A.	\[sp\]
B.	\[s{{p}^{2}}\]
C.	\[s{{p}^{3}}\]
D.	All the above
Answer» C. \[s{{p}^{3}}\]

Discussion

5147.	Which of the following is the correct electronic formula of chlorine molecule [CPMT 1971]
A.	\[:\,\underset{.\,.}{\overset{\,\,\,.\,.}{\mathop{Cl}}}\,\,:\,\underset{.\,.}{\overset{\,\,\,.\,.}{\mathop{Cl}}}\,\,:\]
B.	\[:\,\underset{.\,.}{\overset{\,\,\,.\,.}{\mathop{C{{l}^{-}}}}}\,\,:\,\,:\,\,\underset{.\,.}{\overset{\,.\,.}{\mathop{C{{l}^{+}}}}}\,\,:\]
C.	\[:\,\underset{{}}{\overset{\,\,\,.\,.}{\mathop{Cl}}}\,\,:\,\underset{{}}{\overset{\,\,\,.\,.}{\mathop{Cl}}}\,\,:\]
D.	\[:\,\underset{{}}{\overset{\,\,\,.\,.}{\mathop{Cl}}}\,\,:\,\underset{{}}{\overset{\,\,\,.\,.}{\mathop{\,:\,Cl}}}\,\,:\]
Answer» B. \[:\,\underset{.\,.}{\overset{\,\,\,.\,.}{\mathop{C{{l}^{-}}}}}\,\,:\,\,:\,\,\underset{.\,.}{\overset{\,.\,.}{\mathop{C{{l}^{+}}}}}\,\,:\]

Discussion

5148.	Which one amongst the following possesses an \[sp\] hybridized carbon in its structure [CBSE PMT 1989]
A.	\[Ca{{I}_{2}}\]
B.	\[C.C{{l}_{2}}=C.C{{l}_{2}}\]
C.	\[C{{H}_{2}}=C=C{{H}_{2}}\]
D.	\[C{{H}_{2}}=CH-CH=C{{H}_{2}}\]
Answer» D. \[C{{H}_{2}}=CH-CH=C{{H}_{2}}\]

Discussion

5149.	Shape of methane molecule is [MNR 1983]
A.	Tetrahedral
B.	Pyramidal
C.	Octahedral
D.	Square planer
Answer» B. Pyramidal

Discussion

5150.	The \[C-H\]bond distance is the longest in [MNR 1990]
A.	\[{{C}_{2}}{{H}_{2}}\]
B.	\[{{C}_{2}}{{H}_{4}}\]
C.	\[{{C}_{2}}{{H}_{4}}B{{r}_{2}}\]
D.	\[{{C}_{6}}{{H}_{6}}\]
Answer» D. \[{{C}_{6}}{{H}_{6}}\]

Discussion

Explore topic-wise MCQs in Joint Entrance Exam - Main (JEE Main).

The structure of \[{{H}_{2}}{{O}_{2}}\] is [CBSE PMT 1999; AFMC 2003]

The hybrid orbitals used by central atoms in \[BeC{{l}_{2}},\,\,BC{{l}_{3}}\] and \[CC{{l}_{4}}\] molecules are respectively [MP PMT 1999]

\[s{{p}^{3}}\] hybridization leads to which shape of the molecule [MP PET/PMT 1998]

As the \[p-\]character increases, the bond angle in hybrid orbitals formed by \[s\] and atomic orbitals [MP PMT 1997]

Out of the following hybrid orbitals, the one which forms the bond at angle\[{{120}^{o}}\], is [MP PMT 1997]

In benzene molecule all \[C-C\] bond lengths are equal because

The shapes of \[BC{{l}_{3}},\,\,PC{{l}_{3}}\]and \[IC{{l}_{3}}\]molecules are all

The geometry of sulphur trioxide molecule is

The \[PC{{l}_{5}}\] molecule is a result of the hybridisation of [MP PET 1995; DCE 2000; MP PMT 2002]

Which of the following hybridisation has maximum s-characters [MP PET 1995]

The structure of \[P{{F}_{5}}\]molecule is [AFMC 1995; JIPMER 2001]

The correct order of the \[O-O\] bond length in \[{{O}_{2}},\,\,{{H}_{2}}{{O}_{2}}\] and \[{{O}_{3}}\] is [CBSE PMT 1995]

A \[s{{p}^{3}}\] hybridized orbital contains [DPMT 1984; BHU 1985; CPMT 1976]

In the compound \[C{{H}_{3}}OCl,\] which type of orbitals have been used by the circled carbon in bond formation [MP PET 1994]

The two types of bonds present in \[{{B}_{2}}{{H}_{6}}\] are covalent and [IIT 1994]

s-character in \[sp\]hybridised orbitals are

The number of shared pairs of electrons in propane is [BHU 1981]

In diborane, the \[H-B-H\]bond angle is \[{{120}^{o}}\]. The hybridization of boron is likely to be [BHU 1981; CBSE PMT 1999]

The compound in which \[{{C}^{*}}\] uses \[s{{p}^{3}}\]hybrids for bond formation is [IIT 1989]

The hybridization of carbon atoms in \[C-C\] single bond of \[HC\equiv C-CH=C{{H}_{2}}\] is [IIT 1991; MP PET 1995]

In \[\left[ Cu\,{{\left( N{{H}_{3}} \right)}_{4}} \right]\,S{{O}_{4}},\,\,;\,Cu\] has following hybridization [AIIMS 1988; UPSEAT 2001]

Carbon atoms in diamond are bonded to each other in a configuration [CPMT 1981]

Which of the following molecules has trigonal planer geometry [CBSE PMT 2005]

The species in which the central atom uses \[s{{p}^{2}}\]hybrid orbitals in its bonding is [IIT 1988]

In methane the bond angle is [AMU 1983]

Among the following compounds which is planar in shape [AMU 1992]

The two carbon atoms in acetylene are [AMU 1984; MADT Bihar 1982]

Acetate ion contains [AMU 1983]

The structural formula of a compound is \[C{{H}_{3}}-CH=C=C{{H}_{2}}.\] The type of hybridization at the four carbons from left to right are [CBSE PMT 1989]

Number of shared electrons in between carbon-carbon atoms in ethylene molecule is [MADT Bihar 1983]

In ethene, the bond angle(s) is/are [CPMT 1976; AMU 1984; MP PMT 1985]

Which molecule is linear [MP PMT 1984; IIT 1982, 88; EAMCET 1993; CBSE PMT 1992; MP PET 1995; RPMT 1997]

Which one of the following compounds has bond angle as nearly \[{{90}^{o}}\] [MP PMT 1985]

The nature of hybridization in the \[BC{{l}_{3}}\] molecule is [EAMCET 1982]

When two pairs of electrons are shared, bond is [MNR 1979]

The bond angle in carbon tetrachloride is approximately [MNR 1981; MP PMT 1987]

In the following molecule, the two carbon atoms marked by asterisk (*) possess the following type of hybridized orbitals \[{{H}_{3}}C-{{C}^{*}}\equiv {{C}^{*}}-C{{H}_{3}}\] [NCERT 1984]

The number of unpaired electrons in \[{{O}_{2}}\] molecule is [MNR 1983; Kerala PET 2002]

The compound 1, 2-butadiene has [IIT 1983; MP PMT 1996]

As compared to pure atomic orbitals, hybrid orbitals have

Which species do not have \[s{{p}^{3}}\]hybridization [DPMT 1985]

Experiment shows that \[{{H}_{2}}O\]has a dipole moment while \[C{{O}_{2}}\] has not. Point out the structures which best illustrate these facts [DPMT 1984; NCERT 1983; CPMT 1984]

The central atom in a molecule is in \[s{{p}^{2}}\]hybrid state. The shape of molecule will be [MP PMT 1987; CBSE PMT 1989]

The hybridization of \[Ag\] in the linear complex \[{{\left[ Ag\,{{\left( N{{H}_{3}} \right)}_{2}} \right]}^{+}}\] is [CPMT 1985; BHU 1981]

Which has the shortest \[C-C\] bond length [NCERT 1982; CPMT 1989]

In \[HCHO,\,\,'C'\] has hybridization [AIIMS 1987]

Which of the following is the correct electronic formula of chlorine molecule [CPMT 1971]

Which one amongst the following possesses an \[sp\] hybridized carbon in its structure [CBSE PMT 1989]

Shape of methane molecule is [MNR 1983]

The \[C-H\]bond distance is the longest in [MNR 1990]

In the following molecule, the two carbon atoms marked by asterisk () possess the following type of hybridized orbitals \[{{H}_{3}}C-{{C}^{}}\equiv {{C}^{*}}-C{{H}_{3}}\] [NCERT 1984]