Coordinate Bond

Q.

Explain structures of diborane and boric acid.

Q. The number of sigma and pi-bonds in tetracyanoethene are

1. 
2. 
3. 
4. 

Q. Which of the following molecule has no dative bond?

1. $CO$
2. $C{O}_3^{2-}$
3. $N{H}_4^{+}$
4. All of these

Q. The $B—F$ bond length is the shortest in which of the following species?

1. $B{F}_3\leftarrow N{H}_3$
2. $B{F}_4^{-}$
3. $B{F}_3$
4. $B{F}_3\leftarrow N(C{H}_3{)}_3$

Q.

Which covalent bond is the strongest?

Q. 1) Write \(IUPAC\) name of the following:

A)2) Write \(IUPAC\) name of the following:

B) 3) Write \(IUPAC\) name of the following:

(C)
4) Write \(IUPAC\) name of the following:

D)
5) Write \(IUPAC\) name of the following:

E)
6) Write \(IUPAC\) name of the following:

F)

Q. $N{H}_3$ and $B{F}_3$ form an adduct readily because they form:

1. Covalent bond
2. Coordinate bond
3. Ionic bond
4. hydrogen bond

Q. Predict the correct order of mobility of $B{e}^{2+}$, $M{g}^{2+},$ $S{r}^{2+}$ and $C{a}^{2+}$ions in aqueous medium.

1. $B{e}^{2+}$>$M{g}^{2+}$ > $C{a}^{2+}$> $S{r}^{2+}$
2. $B{e}^{2+}$< $M{g}^{2+}$ < $C{a}^{2+}$< $S{r}^{2+}$
3. $M{g}^{2+}$< $B{e}^{2+}$< $S{r}^{2+}$< $C{a}^{2+}$
4. $B{e}^{2+}$> $M{g}^{2+}$ >$S{r}^{2+}$> $C{a}^{2+}$

Q. Which of the following statement is correct regarding coordinate bond?

1. Electrons are equally shared by the atoms
2. Electrons of one atom are shared between two atoms
3. Hydrogen bond is formed
4. Electrons are completely donated to other atom with no sharing

Q. The enolic form of butanone contains

1. 12 σ bonds, 1 π bond and 2 lone pairs of electrons
2. 11 σ bonds, 1 π bond and 2 lone pairs of electrons
3. 12 σ bonds, 2 π bonds and 2 lone pairs of electrons
4. 13 σ bonds, 1 π bond and 2 lone pairs of electrons.

Q.

How coordinate bond is formed?

Q.

Which of the following molecule or ion possesses electrovalent, covalent and co-ordinate bonds?

1. HCl
2. $N{H}_{4}Cl$
3. $C{l}^{-}$
4. $H_2{O}_2$

Q.

Can ${\mathrm{H}}_3{\mathrm{O}}^{+}$form hydrogen bonds?

Q. The coordinate covalent bond differs from covalent bond in:

1. The donation or sharing in electrons
2. The covalent nature
3. The overlapping of orbitals
4. All of the above

Q. What is a dative bond? How is it formed in ch3no2?

Q.

Name the main factors which are responsible for the existence of a large number of organic compounds.

Q. The correct order of lewis acid strength of $B(OH{)}_3$, $B(N{H}_2{)}_3$, $B{F}_3$ and $BC{l}_3$ is:

1. $B(N{H}_2{)}_3<B(OH{)}_3<B{F}_3<BC{l}_3$
2. $BC{l}_3<B(OH{)}_3<B(N{H}_2{)}_3<B{F}_3$
3. $BC{l}_3<B(N{H}_2{)}_3<B(OH{)}_3<B{F}_3$
4. $B{F}_3<B(OH{)}_3<B(N{H}_2{)}_3=BC{l}_3$

Q. Which of the following does not have any coordinate bond?

1. $S{O}_2$
2. $HN{O}_2$
3. $HN{O}_3$
4. $H_{2}S{O}_3$

Q. There are two types of bonds present in $B_2{H}_6$ one type is 2-centre 2-electron bond and other is 3-centre 2-electron bond.
If the given statement is true enter 1, else enter 0.

Q.

The bond between carbon atoms in graphite is called __________.

Q.

The formulae of two organic acids X and Y are ${\mathrm{C}}_{10}{\mathrm{H}}_{21}\mathrm{COOH}$ and ${\mathrm{C}}_{19}{\mathrm{H}}_{39}\mathrm{COOH}$. Which one of these two exists as a liquid at room temperature?

Q. Consider $I_{2}C{l}_6$ compound and calculate the value of $(x+y)÷z$
Where :
$x=$ Total no. of $(2C–2e^{–})$ bond
$y=$ Total no. of $(3C–2e^{–})$ bond
$z=$ Total no. of $(3C–4e^{–})$ bond
​​​​​​​

Q. $B{F}_3,BC{l}_3,BB{r}_3,B{I}_3$ which has more acidic nature.

Q. Find the total number of $2c-2e$ and $3c-2e$ bonds in $Be(B{H}_4{)}_2$ respectively.

1. $4,8$
2. $6,4$
3. $4,6$
4. $4,4$

Q. $N{H}_{3}andB{F}_3$ form an adduct as they form:

1. Ionic bond
2. Hydrogen bond
3. Covalent bond
4. Coordinate covalent bond

Q.

Adenine pairs with thymine by 'x' hydrogen bonds, guanine forms 'y' hydrogen bonds with cytosine and 'z' hydrogen bonds with thymine. x, y and z are

1. 3, 1, 2

2. 2, 3, 0

3. 2, 1, 3

4. 3, 2, 1

Q. $N{H}_3$ and $B{F}_3$ combine readily with the formation of:

1. a covalent bond
2. a hydrogen bond
3. an ionic bond
4. a coordinate bond

Q. Find out the total number of all $2C-2e^{-}$ and $3C-4e^{-}$ bonds in $BeC{l}_2$.

Q.

Why Sigma bond is a primary bond?

Q. What would be the electron dot structure of carbon dioxide which has formula $C{O}_2$?