CBSE Questions for Class 11 Medical Chemistry Chemical Bonding And Molecular Structure Quiz 12 - MCQExams.com

The correct order of stability of $$Al^+,Al^{+2},Al^{+3}$$ is:
  • $$Al^{+3}>Al^{+2}>Al^+$$
  • $$Al^{+2} > Al^{+3} > Al^+$$
  • $$Al^{+2} < Al^+ > Al^{+3}$$
  • $$Al^{+3} > Al^+ > Al^{+2}$$
Bond-length of $$HCl$$ is $$1.275 \overset oA$$ $$(e=4.8 $$$$\times 10 ^{ -10 }$$ e.s.u.). If dipole moment $$=1.02 D$$ then $$HCl$$ is:
  • $$100\%$$ ionic
  • $$83\%$$ covalent
  • $$50\%$$ covalent
  • $$40\%$$ ionic
The hybridisation of each carbon in the following compound is:
$$\underset {i}{CH_{3}} - \underset {ii}{\overset {\overset {O}{||}}{C}} - \underset {iii}{CH_{2}} - \underset {iv}{CN}$$
  • $$sp^{3}\ sp^{2}\ sp^{3}\ sp$$
  • $$sp^{3}\ sp^{3}\ sp^{2}\ sp$$
  • $$sp^{3}\ sp\ sp^{3}\ sp^{2}$$
  • $$sp^{3}\ sp^{2}\ sp\ sp^{3}$$
Arrange the molecule in the increasing order of bond angle.
  • $${ H }_{ 2 }O< O{ F }_{ 2 }< O{ Cl }_{ 2 }$$
  • $$O{ Cl }_{ 2 }< { H }_{ 2 }O< O{ F }_{ 2 }$$
  • $$O{ F }_{ 2 }< O{ Cl }_{ 2 }< { H }_{ 2 }O\quad $$
  • $$O{ F }_{ 2 }<{ H }_{ 2 }O< O{ Cl }_{ 2 }$$
Correct sequence of repulsion is:
  • Lone pair (LP)-Lone pair $$> $$ Lone pair-bond pair (BP) $$> $$ B.P $$-$$ B.P
  • B.P-B.P$$> $$ B.P-L.P $$> $$ L.P-L.P
  • B.P-B.P $$> $$ L.P.-L.P. $$> $$ BP-LP.
  • double bond-single bond $$< $$ single bond-single bond $$< $$ LP.-LP.
Which of the following is not the correct representation of sigma bond?
The number of $$\sigma$$ and $$\pi$$ bonds in orange azo dye is:
  • $$27$$ and $$5$$
  • $$24$$ and $$7$$
  • $$26$$ and $$7$$
  • $$26$$ and $$6$$
Among the following, the molecules with the lowest dipole moment is
In which of the following compound Cl-atom is involved in H-bonding ?
  • Chloral $$(CCl_3 \, - \, CHO)$$
  • p-chlorophenol
  • o-chlorophenol
  • Hydrochloric acid
Which of the following overlap provides strongest bond?
  • $$s{ p }^{ 3 }-s{ p }^{ 3 }$$
  • $$p-p$$
  • $$s-s$$
  • $$s-p$$
Which of the following has been arranged in order of decreasing dipole moment?
  • $$CH_3Cl> CH_3F> CH_3Br>CH_3I$$
  • $$CH_3F> CH_3Cl> CH_3Br> CH_3I$$
  • $$CH_3Cl> CH_3Br>CH_3I> CH_3F$$
  • $$CH_3F> CH_3Cl> CH_3I> CH_3Br$$
Which of the following compound has highest dipole moment?
The percentage ionic character of a bond having $$1.257A^0$$ its length and $$1.03$$D its dipole moment is:
($$q = 4.8 \times 10^{-10}$$ esu)
  • $$10\%$$
  • $$15\%$$
  • $$16.83\%$$
  • $$18.88\%$$
Which one the following has the smallest dipole moment?
  • 1-Butene
  • Cis-2-Butene
  • Trans-2-Butene
  • 2-methyl-propene
Identify correct order of average molecular dipole moment.
  • $$P{Cl}_{3}{F}_{2}> {N}_{2}{O}_{4(g)}> {N}_{2}{O}_{4(s)}$$
  • $$P{Cl}_{3}{F}_{2}< {N}_{2}{O}_{4(g)}< {N}_{2}{O}_{4(s)}$$
  • $$P{Cl}_{3}{F}_{2}< {N}_{2}{O}_{4(g)}= {N}_{2}{O}_{4(s)}$$
  • All are incorrect.
The dipole moment of HBr is $$1.6\times 10^{-30}$$ c.m. and inter atomic spacing is $$1\overset{o}{A}$$. The percentage ionic character of HBr is:
  • $$10$$
  • $$0$$
  • $$15$$
  • $$27$$
The number $$sp^2 - sp^2$$ sigma bonds in the compound given below is:
988162_7b08f124dd8040ee855d570520c8d3d9.PNG
  • 1
  • 3
  • 4
  • 5
The dipole moments of halo compounds are in the order:
  • $$CHCl_3 > CCl_4 > CH_2Cl_2 > CH_3Cl$$
  • $$CH_3Cl > CHCl_3 > CH_2Cl_2 > CCl_4$$
  • $$CH_3Cl > CH_2Cl_2 > CHCl_3 > CCl_4$$
  • $$CHCl_3 > CH_2Cl_2 > CH_3Cl > CCl_4$$
Which molecule contains both polar and nonpolar covalent bond?
  • $$NH_4Cl$$
  • $$HCN$$
  • $$CH_4$$
  • $$H_2O_2$$
Minimum dipole moment containing compound is:
Which of the following will show least dipole character?
  • Water
  • Ethanol
  • Ethane
  • Ether
Isostructural species are those which have the same shape and hybridisation. Among the given species, identify the isostructural pairs.
  • [$$NF_3$$ and $$BF_3$$]
  • [$$BF_4^-$$ and $$NH_4^+$$]
  • [$$BCl_3$$ and $$BrCl_3$$]
  • [$$NH_3$$ and $$NO^-_3$$]
If a molecule $$MX_3$$ has zero dipole moment, the sigma bonding orbitals used by $$M$$ (atomic number $$< 21$$) are:
  • pure $$p$$
  • $$sp$$ hybrid
  • $$sp^2$$ hybrid
  • $$sp^3$$ hybrid
The number and type of bonds between two carbon atoms in calcium carbide are :
  • one sigma, one pi
  • one sigma, two pi
  • two sigma, one pi
  • two sigma, two pi
$$\triangle $$H of which of the following reaction is zero?
  • $${ H }_{ 2 }\left( g \right) \rightarrow { 2H }^{ + }\left( g \right) +{ 2e }^{ - }$$
  • $$2H\left( g \right) +aq\rightarrow { 2H }^{ + }\left( aq \right) +{ 2e }^{ - }$$
  • $$2H\left( g \right) \rightarrow { 2H }^{ + }\left( g \right) +{ 2e }^{ - }$$
  • $${ H }_{ 2 }\left( g \right) +aq\rightarrow { 2H }^{ + }\left( aq \right) +{ 2e }^{ - }$$
The total number of lone pairs of electrons in $$N_2O_3$$ is:
  • 6
  • 8
  • 5
  • none of these
Which of the following statement is correct?
  • Sigma bond is weaker than pie-bond
  • $$HF$$ is less polar than $$HI$$
  • In $$NH^+_4$$ ions $$4$$ coordinate bond is present
  • In $$SF_6$$ all $$S-F$$ bond length are same
The compound with no dipole moment is:
  • methyl chloride
  • carbon tetrachloride
  • methylene chloride
  • chloroform
Which of the following molecules\ions does not contain unpaired electrons?
  • $$N^+_2$$
  • $$O_2$$
  • $$O^{2-}_2$$
  • $$B_2$$
Arrange the following compounds in order of increasing dipole moment :

Toluene (I)
m- dichlorobenzene (II)
o-dichlorobenzene (III)
p- dichlorobenzene (IV)
  • I < IV < II < III
  • IV < I < II < III
  • IV < I < III < II
  • IV < II < I < III

Following is a diagram representation of standard reduction potential values. Which out of the following undergo disproportionation?


1035723_1a29c85df8c54891a9af18ff559c3efe.png
  • $$Cl{O^ - }$$
  • $$C{l_2}$$
  • $$Cl{O_2}$$
  • $$ClO_3^ - $$
In the given reaction:
$${ \left[ Co{ \left( { NH }_{ 3 } \right)  }_{ 5 }{ H }_{ 2 }O \right]  }^{ 2+ }+{ NH }_{ 3 }\longrightarrow compound(Y)+{ e }^{ - }+{ H }_{ 2 }O$$
Compound (X)
Number of unpaired electron in compound X and compound Y are respectively:
  • $$(1,0)$$
  • $$(3,1)$$
  • $$(1,3)$$
  • $$(3,3)$$
Which conformation has non-zero dipolemoment? 
Bonds and lone pairs present in enolic form of butanone are?
  • $$12\sigma$$ bonds, $$1\pi $$ bond and $$2$$ lone pairs of electrons
  • $$11\sigma$$ bonds, $$1\pi $$ bond and $$2$$ lone pairs of electrons
  • $$12\sigma$$ bonds, $$1\pi $$ bond and $$1$$ lone pairs of electrons
  • $$10\sigma$$ bonds, $$2\pi $$ bond and $$2$$ lone pairs of electrons
A certain diatomic molecule, $$AB$$ has dipole moment $$1.6D$$ and the inter-nuclear distance is $$100pm$$. The percentage of electronic charge existing on more electronegative atom is:
  • $$33$$%
  • $$25$$%
  • $$50$$%
  • $$10$$%
Select the correct statement.
  • $$C$$ is basic, whereas $${ \left( C{ F }_{ 3 } \right) }_{ 3 }N$$ is not
  • $$PbCl_{2}$$ melts at $$606^{o}\ C$$. whereas $$PbCl_{4}$$ melts at $$114^{o}\ C$$.
  • $$NaCl$$ is soluble is petrol
  • Dipole moment of $$BF_{3}$$ is high
Which one of the following dipole moment order is correct?
  • $$CCl_4 > CH_2Cl_2 > CH Cl_3 > CH_3Cl$$
  • $$CH_3Cl > CH_2Cl_2 > CH Cl_3 > CCl_4$$
  • $$CH_2Cl _2> CH_3Cl > CH Cl_3 > CCl_4$$
  • $$CHCl _3> CH_2Cl_2 > CH_3 Cl > CCl_4$$
When 2-butyne is treated with $$H_2/$$Lindlar's catalyst, compound $$X$$ is produced as the major product and when treated with $$Na/$$liq. $$NH_3$$ it produces $$Y$$ as the major product. Which of the following statements is correct?
  • $$X$$ will have higher dipole moment and higher boiling point than $$Y$$
  • $$Y$$ will have higher dipole moment and higher boiling point than $$X$$
  • $$X$$ will have lower dipole moment and lower boiling point than $$Y$$
  • $$Y$$ will have lower dipole moment and lower boiling point than $$X$$
When $${O}_{2}$$ is converted into $${O}_{2}^{+}$$
  • both paramagnetic character and bond order increases
  • bond order decreases
  • paramagnetic character increases
  • paramagnetic character decreases and the bond order increases
The dipole moment of hydrogen chloride with bond distance $$1.27A^o$$ is $$1.03\ D$$. The percent ionic character of its bond is?
  • $$15$$
  • $$17$$
  • $$19$$
  • $$21$$
Which of the following compound has $$\mu =0$$?
  • $$CCl_4$$
  • $$CHCl_3$$
  • $$HF$$
  • $$NH_3$$
Number and type of bonds between two carbon atom in $$CaC_{2}$$ are :
  • $$one (\sigma )\ and\ one(\pi )\ bonds $$
  • $$one (\sigma )\ and\ two(\pi )\ bonds $$
  • $$3 (\sigma)\ and 2(\pi )\ bonds $$
  • $$one (\sigma)\ bond $$
Dipole moment of $$H_2O$$ is $$1.84 D$$.If the bond angle is $$105^o$$ and $$O-H$$ bond length is $$0.94 AA $$,what is the magnitude of charge on the atom in water molecules?
  • $$2\times10^{-10}$$ esu
  • $$3.28\times10^{-10}$$ esu
  • $$3.22\times10^{-10}$$ esu
  • $$1.602\times10^{-19} C$$
The molecule which have zero dipole moment is
  • $${CH}_{2}{Cl}_{2}$$
  • $${BF}_{3}$$
  • $${NF}_{3}$$
  • $${IF}_{3}$$
Dipole moment is shown by?
  • 1, 2-dichlorobenzene
  • trans 2, 3-dichloro-2-butene
  • 1, 4-DIchlorobenzene
  • trans-1, 2-dinitroethene
Dative bond is not present in ?
  • $$NH_{4}^{+}$$
  • $$N_{2}O$$
  • $$BCl_{3}$$
  • $$B_{3}N_{3}H_{6}$$
Consider the following three halides:
(i) $${CH}_{3}-{CH}_{2}Cl$$
(ii) $${CH}_{2}=CH-Cl$$
(iii) $${C}_{6}{H}_{5}-Cl$$
Arrange $$C-Cl$$ bond lenght of these compounds in decreasing order:
  • $$i> ii> iii$$
  • $$i> iii> ii$$
  • $$iii> ii> i$$
  • $$ii> iii> i$$
A reagent which lowers the oxidation number of an element in a given substance is known as
  • oxidation agent 
  • reduction 
  • reducing agent 
  • oxidation 
Which of the following has zero dipole
  • $${BF}_{3}$$
  • $$BeClBr$$
  • $${CH}_{2}{Cl}_{2}$$
  • $$COS$$
The $$X-X$$ bond length is $$1.00\mathring{A}$$ and $$C-C$$ bond length is $$1.54\mathring{A}$$. The $$C-X$$ bond length is likely to be
  • $$0.80\mathring {A}$$
  • $$1.18\mathring {A}$$
  • $$1.57\mathring {A}$$
  • $$1.68\mathring {A}$$
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