CBSE Questions for Class 11 Medical Chemistry Chemical Bonding And Molecular Structure Quiz 13 - MCQExams.com

Which molecule has zero dipole moment?
  • $$Xe{F}_{2}$$
  • $${SO}_{2}$$
  • $${CH}_{4}$$
  • p-dimethoxy benzene
Which of the following molecules has unequal bond length ?
  • BF$$_3$$
  • PF$$_3$$
  • PF$$_5$$
  • SF$$_6$$
The bonds present in borazole are
  • 9 $$sigma$$, 6 $$pi$$
  • 12 $$sigma$$, 3 $$pi$$
  • 6 $$sigma$$, 9 $$pi$$
  • 15 $$sigma$$ only
The order of O-O bond length $$O_2, H_2O_2, O_3$$ is
  • $$O_2 > O_3 > H_2O_2$$
  • $$H_2O_2 > O_3 > O_2$$
  • $$O_3 > H_2O_2 > O_2$$
  • $$O_2 > H_2O_2 > O_3$$
The structure of $$I{Cl}_{2}^{-}$$ is
  • trigonal
  • octahedral
  • square planar
  • linear
Select the correct statement
  • $$ (C{ H }_{ 3 }{ ) }_{ 3 }\bar { C } $$ is pyramidal while $$\bar { C } (CN{ ) }_{ 3 }$$ is planar
  • $$ \bar { C } (CN{ ) }_{ 3 }$$ is Pyramidal while $$\bar { C } (C{ H }_{ 3 }{ ) }_{ 3 }$$ is plannar
  • both $$ \bar { C } (CN{ ) }_{ 3 }$$and $$\bar { C } (C{ H }_{ 3 }{ ) }_{ 3 }$$ are planar
  • both $$ \bar { C } (CN{ ) }_{ 3 }$$and $$ \bar { C } (C{ H }_{ 3 }{ ) }_{ 3 }$$ are Pyramidal
Total number of electron pairs in $$PCl_{5},\ PCl_{4}^{+}$$ and $$PCl_{6}^{-}$$ are respectively:
  • $$20,16,24$$
  • $$24,16,20$$
  • $$16,20,24$$
  • $$24,20,16$$
Which of the following statements given below is incorrect :
  • $$ONF$$ is isoelectronic with $${O_2}{N^ - }$$
  • $${\rm{O}}{{\rm{F}}_2}$$ is an oxide of fluorine
  • $$C{l_2}{O_7}$$ is an anhydride of perchloric acid
  • $${O_3}$$ molecule is bent
During change of $$NO^{+}\rightarrow NO$$, the electron is added to
  • $$\sigma$$-orbital
  • $$\pi $$-orbital
  • $$\sigma \quad ^{ \ast }$$-orbital
  • $$\pi \quad ^{ \ast }$$-orbital
Hybridization of central atoms in the molecules $$N(CH_3)_3$$ and $$N(SiH_3)_3$$ respectively are:
  • $$sp^2$$ nad $$sp^2$$
  • $$sp^3$$ and $$sp^3$$
  • $$sp^2$$ and $$sp^3$$
  • $$sp^3$$ and $$sp^2$$

Product will be:
1153294_bde91dfa90d04f96934d6589062cbb9b.PNG
Which of the following compound has four bond pair and one lone pair?
  • $${ NH }_{ 4 }^{ + }$$
  • $${ ICI }_{ 4 }^{ - }$$
  • $${ SF }_{ 4 }$$
  • $${ XeF }_{ 4 }$$
The order of number of lone pair of xenon in following compound is.
  • $$XeF_2 > XeF_4 > XeO_3 > XeO_4$$
  • $${XeF_6} > XeOF_4 > XeO_3F_2$$
  • $${XeO_6}^{4-} > {HXeO_4}^-$$
  • $${XeF_5}^- > XeF_2 > XeO_3 > XeO_4$$
In $$ XeO_3F_2 $$ the number of bond pairs on $$Xe$$ atom is:
  • 5
  • 2
  • 0
  • 4

The pair of species with the same bond order is:
  • NO,CO
  • $$O_2^{2 - }{B_2}$$
  • $$O_2^ + ,N{O^ + }$$
  • None of the above
The charge of an electron is $$-1.6 \times 10^{-19}C$$.The value free charge on $$Li^+$$ ion will be 
  • $$3.6\times 10^{19}C$$
  • $$1\times 10^{-19}C$$
  • $$1.6\times 10^{-19}C$$
  • $$2.6 \times 10^{-19}C$$
$$LiH + \underline {B}_2H_6 \rightarrow 2Li \underline{B}H_4$$

Find the change in hybridization of the underlined atom.
  • $$sp^2 \rightarrow sp^3$$
  • $$sp^3 \rightarrow sp^2$$
  • $$sp \rightarrow sp^3$$
  • None
The number of right angled bonds in $${ BrF }_{ 5 }$$ is:
  • Six
  • Eight
  • Zero
  • Four
Which has zero dipole moment
  • cis-2-butene
  • trans-2-butene
  • 1-butene
  • 2-methyl-1-propene
What is the formal charge on $$Cl$$ in the following Lewis structure?
1230611_a82794ec0fbe4b2486535c264dc976ab.png
  • $$0$$
  • $$+3$$
  • $$+5$$
  • $$+7$$
Select the isomer given below, which have non-zero dipole moment?
  • all of these
For a diatomic molecule the dipole moment is 1.2 D and bond length is 1.0$$\overset { \circ  }{ A } $$ then charge fraction on each atoms is:
  • $$12\%$$
  • $$18\%$$
  • $$25\%$$
  • $$29\%$$
Which of the following species is polar?
  • $$IF_7$$
  • $$CIF_3$$
  • $$XeF_4$$
  • $$SiF_4$$
Which of the following molecules has the shortest $$C=C$$ bond length?
  • $$CH_2=C=CH_2$$
  • $$CH_3-CH=CH_2$$
Which of the following molecules will have polar bonds but zero dipole moment?
  • $$ O_2 $$
  • $$ CHCI_3 $$
  • $$ CF_4 $$
  • None of these
In $$CH_3CH_2OH$$ the bond that undergoes heterolytic most readily is :
  • C-C
  • C-H
  • C-O
  • O-H
How many pi (n) electrons are there in the following molecules?
1289102_a3a3fd972a0b4120a66fd53e63eb7629.PNG
  • 4
  • 6
  • 8
  • 10
In which of the following order is correct for diopole moment?
  • $$CH_3F > CH_3CI > CH_3Br > CH_3I$$
  • $$CH_3CI > CH_3Br > CH_3F > CH_3I$$
  • $$CH_3Br > CH_3CI > CH_3I > CH_3F$$
  • $$CH_3CI > CH_3F > CH_3Br > CH_3I$$
Which of the following is correct order of dipole moment.
  • $$CHC{L_3} > C{H_2}C{l_2} > C{H_3}Cl > CC{l_4}$$
  • $$C{H_3}Cl > C{H_2}C{l_2} > CHC{l_3} > CC{l_4}$$
  • $$C{H_2}C{l_2} > C{H_3}Cl > CHC{l_3} > CC{l_4}$$
  • $$CHC{l_3} > C{H_3}Cl > C{H_2}C{l_2} > CC{l_4}$$
Which of the following is incorrect order of dipole moment 
  • $$N{H_3} > N{F_3} > NC{l_3}$$
  • $$N{H_3} > NC{l_3} > N{F_3}$$
  • $$C{H_3}Cl > C{H_3}F > C{H_3}Br$$
  • $$HF > HCl > HBr$$
Which of the following species has maximum dipole moment
  • $$C{H_3}F$$
  • $$C{H_3}Cl$$
  • $$C{H_3}Br$$
  • $$C{H_3}I$$
Which of the following is the correct order of dipole moment?
  • $$P(CF_3)_3(CH_3)_2 > P(CH_3)_3(CF_3)_2$$
  • $$CH_3F > CH_3 Cl$$
  • $$CH_2 Cl_2 > CH_3Cl$$
Which of the following species is non polar?
  • $$SO_{2}$$
  • $$NO_{2}^{\ominus}$$
  • $$XeOF_{2}$$
  • $$PCl_{3}F_{2}$$
Which of the following have largest dipole moment ?
Find the total number of sigma bonds in $$H_nP_nO_{3n}$$ where n > 2.
  • 3n
  • 4n
  • 5n
  • 3 (n-1)
Which of the following compounds will show highest dipole moment 
The dipole moment of the ammonia molecule is $$1.48D$$. The length of the dipole is 
  • $$3.08\times 10^{-13}\ m$$
  • $$5\times 10^{2}\ m$$
  • $$308\ m$$
  • $$None of these$$
Which of the following fluoride of xenon has zero dipole moment?
  • $$XeF_2$$
  • $$XeF_3$$
  • $$XeF_4$$
  • $$XeF_6$$
The enthalpy of combination of $$H_2(g)$$ at $$298\,K$$ to given $$H_2O$$ is $$-298\,kJ\,mol^{-1}$$ and bond enthapies of $$H-H$$ and $$O=O$$ are $$433\,kJ\,mol^{-1}$$ and $$492 kJ\,mol^{-1}$$, respectively.The mean bond enthalpy of $$O-H$$ is:
$$(\Delta H_{vap}$$ of $$H_2O=40.65\,kJ/mol)$$
  • $$464\,kJ\,mol^{-1}$$
  • $$488.5\,kJ\,mol^{-1}$$
  • $$232\,kJ\,mol^{-1}$$
  • $$-232\,kJ\,mol^{-1}$$
How many sigma $$s-sp^3$$ bonds are there in ethane?
  • 7
  • 5
  • 6
  • 3
In which pair, the stronger bond found in the first species
a)$$
O_{2}^{-}, O_{2}
 $$ b) $$
\mathbf{N}_{2} \cdot \mathbf{N}_{2}^{+}
 $$ c) $$
\mathrm{NO}^{+}, \mathrm{NO}^{-}
 $$
  • a only
  • b only
  • a and c only
  • b and c only
Among the species $$C{O_2}C{H_3}CO{O^ - },CO,C{O_3}^{2 - }$$ HCHO which has the weakest carbon oxygen bond 
  • $$C{O_2}$$
  • $$C{H_3}CO{O^ - }$$
  • $$CO$$
  • $$C{O_3}^{2 - }$$
The interaction energy between two temporary dipoles is proportional to (where r is the distance between the two particles)
  • $$1/r^4$$
  • $$1/r^2$$
  • $$1/r^5$$
  • $$1/r^6$$

Carbon - halogen bond is most susceptible to cleave in
  • Benzyl bromide
  • Bromobenzene
  • Vinyl bromide
  • Benzyl chloride
The X -X bond lenght is $$1.00$$  $$\mathop A\limits^ \circ  $$ and C - C bond length is $$1.54$$ $$\mathop A\limits^ \circ  $$  . If electronegativities of $$X$$ and $$C$$ are $$3.0$$ and $$2.0$$ respestively the C - X bond length is likely to be :-
  • $$1.27\,\mathop A\limits^ \circ $$
  • $$1.18\,\mathop A\limits^ \circ $$
  • $$1.08\,\mathop A\limits^ \circ $$
  • $$1.28\,\mathop A\limits^ \circ $$
Which of the following has non-zero dipole moment?
  • Trans-2-butene
  • Boron trichloride
Which of the following combinations is not allowed (assumed z-axis is internuclear axis).
  • $$2s$$ and $$2s$$
  • $$2p_{x}$$ and $$2p_{x}$$
  • $$2s$$ and $$2p_{x}$$
  • $$2p_{x}$$ and $$2p_{y}$$
The compound with lowest dipole moment is.
  • $$C{H_3}F$$
  • $$C{H_3}CI$$
  • $$C{H_3}Br$$
  • $$CH{Cl}_3$$

Which of the following compounds has the largest
dipole moment? 
  • $$CH_3-Cl$$
  • $$CH_2-Cl_2$$
  • $$CH-Cl_3$$
  • $$C-Cl_4$$
$$\rm{O-H}$$  bond length is  $$1 \mathop {\text{A}}\limits^ \circ $$  and it's dipole moment is  $$1.5D$$.  So the fraction of the charge on oxygen is
  • $$0.3125$$
  • $$0.4$$
  • $$0.5$$
  • $$0.246$$
0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Class 11 Medical Chemistry Quiz Questions and Answers