Chemical Bonding and Molecular Structure Test 41

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Chemical Bonding and Molecular Structure Test 41

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is/are correct :

A
Carbon-carbon bond length in $$CaC_2$$ will be more than that in $$CH_2CCH_2$$

B
O-O bond length in $$KO_2$$will be more than that in $$ Na_2O_2$$

C
O-O bond length in $$O_2[PtF_6] $$will be less than that in $$KO_2$$

D
N-O bond length in NO gaseous molecule will be smaller than that bond length in NOCI gaseous molecule.

Solution
Question 2
1 / -0

Bonds and lone pairs present in enolic form of butanone are?

A
$$12\sigma$$ bonds, $$1\pi $$ bond and $$2$$ lone pairs of electrons

B
$$11\sigma$$ bonds, $$1\pi $$ bond and $$2$$ lone pairs of electrons

C
$$12\sigma$$ bonds, $$1\pi $$ bond and $$1$$ lone pairs of electrons

D
$$10\sigma$$ bonds, $$2\pi $$ bond and $$2$$ lone pairs of electrons

Solution
Question 3
1 / -0

The correct order of $$C-N$$ bond length among these compounds is:

A
$$I> II> III$$

B
$$III> II> I$$

C
$$III> I> II$$

D
$$II> I> III$$

Solution

There will be no double bond formed between C and N, as a result of resonance.

Thus the bond length increases from $$1.4{ 3 }\overset { o }{ A } -1.53\overset { o }{ A } $$.

Hence, option(A) is correct.
Question 4
1 / -0

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:

A
$$33$$%

B
$$25$$%

C
$$50$$%

D
$$10$$%

Solution

% of ionic character= observed ionic × 100observed = $$1.6 D$$ =$$ 1.6 × 10−30 cm (since 1 D = 10−30 cm)$$
$$ionic = q × d q = 4.8 × 10−10$$
$$esu = 4.8 × 108 D = 4.8 × 108× 10−30 cm (since 1D = 10−18 esu)$$
$$d = 100 pm = 100 × 10−10 cm$$
$$% ionic character = observed ionic × 100 = 1.6 × 10−30$$
$$4.8 × 108× 10−30× 100 × 10−10 × 100 = 33.33 %$$
Therefore, $$33.33% $$ is the answer.
Question 5
1 / -0

Which one of the following dipole moment order is correct?

A
$$CCl_4 > CH_2Cl_2 > CH Cl_3 > CH_3Cl$$

B
$$CH_3Cl > CH_2Cl_2 > CH Cl_3 > CCl_4$$

C
$$CH_2Cl _2> CH_3Cl > CH Cl_3 > CCl_4$$

D
$$CHCl _3> CH_2Cl_2 > CH_3 Cl > CCl_4$$
Question 6
1 / -0

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?

A
$$X$$ will have higher dipole moment and higher boiling point than $$Y$$

B
$$Y$$ will have higher dipole moment and higher boiling point than $$X$$

C
$$X$$ will have lower dipole moment and lower boiling point than $$Y$$

D
$$Y$$ will have lower dipole moment and lower boiling point than $$X$$

Solution

As we learnt,
Birch Reduction:
Alkynes on reduction with sodium in liquid $${ NH }_{ 3 }$$ form trans alkene where in
Reduction of alkynes.
Proceeds via two single electron transfer from $$Na$$ to alkyne each followed by protonation with $${ NH }_{ 3 }$$.
Cis have higher dipole moment than trans option $$1$$ is correct. i.e,
$$X$$ will have higher dipole moment and higher boiling point than $$Y$$.
Question 7
1 / -0

The dipole moment of hydrogen chloride with bond distance $$1.27A^o$$ is $$1.03\ D$$. The percent ionic character of its bond is?

A
$$15$$

B
$$17$$

C
$$19$$

D
$$21$$
Question 8
1 / -0

Which of the following has zero dipole

A
$${BF}_{3}$$

B
$$BeClBr$$

C
$${CH}_{2}{Cl}_{2}$$

D
$$COS$$

Solution
Question 9
1 / -0

Which of the following compound has $$\mu =0$$?

A
$$CCl_4$$

B
$$CHCl_3$$

C
$$HF$$

D
$$NH_3$$

Solution
Question 10
1 / -0

Number and type of bonds between two carbon atom in $$CaC_{2}$$ are :

A
$$one (\sigma )\ and\ one(\pi )\ bonds $$

B
$$one (\sigma )\ and\ two(\pi )\ bonds $$

C
$$3 (\sigma)\ and 2(\pi )\ bonds $$

D
$$one (\sigma)\ bond $$

Solution