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Bond Order an...

Bond Order and Enthalpy

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Q.

Define bond order. Calculate the bond order of C₂, H₂, and N₂.

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Q.

How do I write the electron configuration of an oxygen molecule?

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Q.

The correct order of the $O - O$ bond length in $O_{2}, H_{2} O_{2}$ and $O_{3}$ is

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Q. Which of the following is correct regarding to bonding of Al2(CH3)6:- 1. 22(2C-2e bond ) & 2(3C-2e) bond 2. 4(2C-2e ) bond & 2(3C-2e) bond 3. All central atom are having complete octet 4. Molecule is planar

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Q.

Of the species, $NO, {NO}^{+}, {NO}^{2 +} and {NO}^{-}$ , the one with minimum bond strength is:

${NO}^{-}$
${NO}^{+}$
${NO}^{2 +}$
$NO$

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Q. Which of the following options represents the correct bond order?

$O_{2}^{-} < O_{2} > O_{2}^{+}$
$O_{2}^{-} > O_{2} > O_{2}^{+}$
$O_{2}^{-} < O_{2} < O_{2}^{+}$
$O_{2}^{-} > O_{2} < O_{2}^{+}$

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Q.

For the reaction: $C_{2} H_{6} \to_{}^{} C_{2} H_{4} + H_{2}$ . The reaction enthalpy $∆ rH =$ __________ $kJ {mol}^{- 1}$ . (Round off to the Nearest Integer).

[Given: Bond enthalpies in $kJ {mol}^{- 1}; C - C : 347; C = C : 611; C - H : 414; H - H : 436$ ]

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Q. Which one of the following compounds does not exhibit resonance?

$C H_{3} C H_{2} O C H = C H_{2}$
$C H_{3} C H_{2} C H_{2} C O N H_{2}$
$C H_{3} C H_{2} C H = C H C H_{2} N H_{2}$

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Q.

If the activation energy of a reaction is 80.9 kJ mol^–1, the fraction of molecules at 700K, having enough energy to react to form products is e^–x. The value of x is ______. (Rounded off to the nearest integer) [Use R = 8.31 JK^-1 mol^-1]

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Q.

The PP bond energy is X KJ/mole then the energy needed for the dissociation of 124 grams of white phosphorus is

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Q. Why do the transition elements exhibit higher enthalpies of atomisation?

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Q. The correct order of bond lengths is:

$O_{2}^{+} > O_{2}^{2 -} > O_{2}^{-}$
$O_{2}^{-} > O_{2}^{+} > O_{2}^{2 -}$
$O_{2}^{2 -} > O_{2}^{-} > O_{2}^{+}$
$O_{2}^{+} > O_{2}^{-} > O_{2}^{2 -}$

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Q.

why does an electron releasing group decrease polarity of bonds

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Q.

Why do coordination compounds have color?

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Q.

Which of the following has the highest bond angle?

$H_{2} O$
$H_{2} S$
${NH}_{3}$
${PH}_{3}$

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Q. Explain the non - liner shape of

H_{2} S

and non planar shape of

P C l_{3}

using valence shell electron pair repulsion theory.

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Q. Which of the following bonds has the highest bond energy?

$C - C$
$C \equiv C$
$C = C$
$C - H$

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Q.

How many σ-bonds and π bonds are present in the given compound?

${CH}_{3} - {CH}_{2} - CH = CH - C \equiv CH$

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Q.

How do you express the bond strength in terms of bond order?

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Q. What do you meant by term bond order? Calculate the bond order of

N_{2}, C_{2}, H_{2}, N_{2}

.

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Q. The electronegativity of

F, O, N, C l

and

H

are

4.0, 3.5, 3.0, 3.2

and

2.1

respectively. The strongest bond between the following will be:

$O - H$
$O - C l$
$N - H$
$F - O$

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Q.

Out of the following which has smallest bond length

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Q. The bond order of

X - O

bond in

H P O_{3}^{2 -}

and

C l O_{4}^{-}

are respectively

$1.33 a n d 1.25$
$1.25 a n d 1.75$
$1.33 a n d 1.33$
$1.33 a n d 1.75$

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Q. The bond order of

X - O

bond in

H P O_{3}^{2 -}

and

C l O_{4}^{-}

are respectively

$1.25 a n d 1.75$
$1.33 a n d 1.25$
$1.33 a n d 1.33$
$1.33 a n d 1.75$

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Q. Bond order of Benzene is

1.5

. Explain how.

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Q. Draw the resonance structures for the following compounds. Show the electron shift using curved-arrow notation.
a)

C_{6} H_{5} O H

b)

C_{6} H_{5} N O_{2}

c)

C H_{3} C H = C H - C H O

d)

C_{6} H_{5} - C H O

e)

C_{6} H_{5} - + C H_{2}

f)

C H_{3} C H = C H + C H_{2}

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Q. Consider the following statements regarding hydrides of VIA group elements.
i) The order of volatility

H_{2} O < H_{2} T e < H_{2} S e < H_{2} S

ii) The order of Boiling point

H_{2} O > H_{2} T e > H_{2} S e > H_{2} S

iii) The order of bond angles

H_{2} O > H_{2} S > H_{2} S e > H_{2} T e

Choose the correct option.

ii & iii are correct
i & iii are correct
All are correct
Only i is correct

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Q. Match the ionization processes listed in column-I with the changes observed as listed in column - II. For this use the codes given below:

\begin{matrix} Column-I & Column-II (a) N_{2} \to N_{2}^{+} & (p) Bond order increases and magnetic property is changed (b) O_{2}^{+} \to O_{2}^{2 +} & (q) Bond order decreases and magnetic property is not changed (c) B_{2} \to B_{2}^{+} & (r) Bond order increases and magnetic property is not changed (d) N O^{-} \to N O & (s) Bond order decreases and magnetic property is changed \end{matrix}

Note: Here change in magnetic property refers to change from diamagnetic to paramagnetic or paramagnetic to diamagnetic.

$\begin{matrix} a & b & c & d s & p & r & q \end{matrix}$
$\begin{matrix} a & b & c & d s & p & q & r \end{matrix}$
$\begin{matrix} a & b & c & d r & q & s & p \end{matrix}$
$\begin{matrix} a & b & c & d p & s & q & r \end{matrix}$

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Q.

Question 51

What is meant by the term average bond enthalpy? Why is there difference in bond enthlpy of O - H bond in ethanol $(C_{2} H_{5} O H)$ and water?

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Q. The table shown below gives the bond dissociation energies

(E_{d i s})

for single covalent bonds of carbon

(C)

atoms with element

^{'} A^{'},^{'} B^{'},^{'} C^{'}

and

^{'} D^{'}

. Which element has the smallest atoms?

\begin{matrix} Bond & E_{d i s} ({kJ mol}^{- 1}) C - A & 240 C - B & 328 C - C & 276 C - D & 485 \end{matrix}

$C$
$A$
$D$
$B$

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