Q: Acetic acid reacts with \$ PCl_5\$ to form :

Acetic acid reacts with \$PCl_5\$ to form acetyl chloride.\$ \underset {\text{acetic acid}}{CH_3 COOH + PCl_5} \rightarrow \underset { \text {acetyl chloride} } {CH_3 COCl} + POCl_3 + HCl \$

Q: In solid state \$PCl_{5}\$ is a :

In solid state \$PCl_5\$ tries to exist as oppositely charged ions like (1) \$PCl_4^{+}\$ and (2) \$PCl_6^{-}\$ as the ionic bonding enhances the crystalline nature . also \$PCl_4^{+}\$ is tetrahedral , while \$PCl_6^{-}\$ is octahedral . these structure fit well into each other which gives more stability to solid structure .Hence option D is correct.

Q: In solid state \$PCl_{5}\$ exist as an ionic solid \$[PCl_{4}]^{+} [PCl_{6}]^{-}\$ hybridisation state of cation and anion respectively :

In the solid state it exists as an ionic solid, \${[PCl4]}^{+}{[PCl6]}^{-}\$. The cation, \${[PCl4]}^{+}\$ is tetrahedral and \${sp}^{3}\$ hybridised. The anion, \${[PCl6]}^{-}\$ is octahedral and is \${sp}^{3}{d}^{2}\$ hybridised.

Q: Among the following the number of compounds that can react with \$PCl_{5}\$ to give \$POCl_{3}\$ is :\$O_{2},CO_{2},SO_{2},H_{2}O,H_{2}SO_{4},P_{4}O_{10}\$

Except for \$O_2\$ and \$CO_2\$ all others react with \$PCl_5\$ to give \$POCl_3\$.\$SO_2(g)+PCl_5(s)\rightarrow SOCl_2(l)+POCl_3(l)\$\$PCl_5+H_2O\rightarrow POCl_3+2HCl\$\$H_2SO_4+2PCl_5\rightarrow 2POCl_3+SO_2Cl_2+HCl\$\$P_4O_10+6PCl5\rightarrow 10POCl_3\$So there 4 compounds which can react with \$PCl_5\$.Hence option C is correct.

Q: Draw structure and write geometry of \$PCl_3\$ and \$PCl_5\$.

\$PCl_3\$ have pyramidal geometry , where as \$PCl_5\$ have trigonal bipyramidal shape.

Q: What happens when \$PCl_5\$ is heated?

When \$PCl_5\$ is heated it decomposes to give \$PCl_3\$ & chlorine gas. An equilibrium is established.\${PCl_5}_{(g)} \rightleftharpoons {PCl_3}_{(g)}+{Cl_2}_{(g)}\$

Q: In the solid state \$PCl_{5}\$ exists as:

In the solid state, \$PCl_5\$ prefers to exist as oppositely charged ion like \$[PCl_4]^+\$ and \$[PCl_6]^-\$ as ionic bonding enhances the crystalline nature. The shape is more stable in the ionic form as it forms the tetrahedral and octahedral shape.

Q: Answer the following:Why does \$PCl_3\$ fume in air?

\$PCl_3\$ combines with moisture of air and undergoes hydrolysis giving fumes of \$HCl\$.\$PCl_3+3H_2O \to H_3PO_3+3HCl\$

Q: Write down a balanced equation for the hydrolysis of \$PCl_{5}\$ with heavy water.

It reacts with heavy water to form phosphorus oxychloride \$(POCl_{3})\$ and deuterium chloride \$(DCl). POCl_{3}\$ reacts further with heavy water to form \$(DCl). POCl_{3}\$.\$PCl_{5} + D_{2}O \rightarrow POCl_{3} + 2DCl\$\$\underline {POCl_{3} + 3D_{2}O \rightarrow D_{3}PO_{4} + 3DCl}\$\$PCl_{5} + 4D_{2}O\rightarrow D_{3}PO_{4} + \underset {Deuterium\ chloride}{5DCl}\$

Question 1

Identify the incorrect statement related to $PCl_5$ from the following:

Accepted Answer

(1) True(2) True(3) True(4) False Due to longer and hence weaker axial bonds, $PCl_5 $ is a reactive molecule.

Question 2

Acetic acid reacts with $ PCl_5$ to form :

Accepted Answer

Acetic acid reacts with $PCl_5$ to form acetyl chloride.$ \underset {\text{acetic acid}}{CH_3 COOH + PCl_5} \rightarrow \underset { \text {acetyl chloride} } {CH_3 COCl} + POCl_3 + HCl $

Question 3

In solid state $PCl_{5}$ is a :

Accepted Answer

&#10;&#10;In solid state $PCl_5$ tries  to exist as oppositely charged ions like&#10;&#10;(1) $PCl_4^{+}$ and (2) $PCl_6^{-}$ as the ionic bonding&#10;enhances the crystalline nature .&#10;&#10;also $PCl_4^{+}$  is&#10;tetrahedral , while $PCl_6^{-}$ is octahedral . these structure fit well into&#10;each other which gives more stability to solid structure .Hence option D is correct.&#10;&#10;

Question 4

In solid state $PCl_{5}$ exist as an ionic solid $[PCl_{4}]^{+} [PCl_{6}]^{-}$ hybridisation state of cation and anion respectively :

Accepted Answer

In the solid state it exists as an ionic solid, ${[PCl4]}^{+}{[PCl6]}^{-}$. The cation, ${[PCl4]}^{+}$ is tetrahedral and ${sp}^{3}$ hybridised. The anion, ${[PCl6]}^{-}$ is octahedral and is ${sp}^{3}{d}^{2}$ hybridised.

Question 5

Among the following the number of compounds that can react with $PCl_{5}$ to give $POCl_{3}$ is :$O_{2},CO_{2},SO_{2},H_{2}O,H_{2}SO_{4},P_{4}O_{10}$

Accepted Answer

Except  for $O_2$ and $CO_2$ all others react with $PCl_5$ to give $POCl_3$.$SO_2(g)+PCl_5(s)\rightarrow SOCl_2(l)+POCl_3(l)$$PCl_5+H_2O\rightarrow POCl_3+2HCl$$H_2SO_4+2PCl_5\rightarrow 2POCl_3+SO_2Cl_2+HCl$$P_4O_10+6PCl5\rightarrow 10POCl_3$So there 4 compounds which can react with $PCl_5$.Hence option C is correct.

Question 6

Draw structure and write geometry of $PCl_3$ and $PCl_5$.

Accepted Answer

$PCl_3$ have pyramidal geometry , where as $PCl_5$ have trigonal bipyramidal shape.

Question 7

What happens when $PCl_5$ is heated?

Accepted Answer

When $PCl_5$ is heated it decomposes to give $PCl_3$ & chlorine gas. An equilibrium is established.${PCl_5}_{(g)} \rightleftharpoons {PCl_3}_{(g)}+{Cl_2}_{(g)}$

Question 8

In the solid state $PCl_{5}$ exists as:

Accepted Answer

In the solid state, $PCl_5$ prefers to exist as oppositely charged ion like $[PCl_4]^+$ and $[PCl_6]^-$ as ionic bonding enhances the crystalline nature. The shape is more stable in the ionic form as it forms the tetrahedral and octahedral shape.

Question 9

Answer the following:Why does $PCl_3$ fume in air?

Accepted Answer

$PCl_3$ combines with moisture of air and undergoes hydrolysis giving fumes of $HCl$.$PCl_3+3H_2O \to H_3PO_3+3HCl$

Question 10

Write down a balanced equation for the hydrolysis of $PCl_{5}$ with heavy water.

Accepted Answer

It reacts with heavy water to form phosphorus oxychloride $(POCl_{3})$ and deuterium chloride $(DCl). POCl_{3}$ reacts further with heavy water to form $(DCl). POCl_{3}$.$PCl_{5} + D_{2}O \rightarrow POCl_{3} + 2DCl$$\underline {POCl_{3} + 3D_{2}O \rightarrow D_{3}PO_{4} + 3DCl}$$PCl_{5} + 4D_{2}O\rightarrow D_{3}PO_{4} + \underset {Deuterium\ chloride}{5DCl}$

Revise with Concepts

Compounds of Phosphorus - PCl3

Compounds of Phosphorus - PCl5

Quick Summary With Stories

Compounds of Phosphorous - Phosphorous trichloride

Compounds of Phosphorous- Phosphorous pentachloride

Identify the incorrect statement related to $P C l_{5}$ from the following:

Acetic acid reacts with $P C l_{5}$ to form :

In solid state $P C l_{5}$ is a :

In solid state $P C l_{5}$ exist as an ionic solid $[P C l_{4}]^{+} [P C l_{6}]^{-}$ hybridisation state of cation and anion respectively :

Among the following the number of compounds that can react with $P C l_{5}$ to give $P O C l_{3}$ is :
$O_{2}, C O_{2}, S O_{2}, H_{2} O, H_{2} S O_{4}, P_{4} O_{10}$

Draw structure and write geometry of $P C l_{3}$ and $P C l_{5}$ .

What happens when $P C l_{5}$ is heated?

In the solid state $P C l_{5}$ exists as:

Answer the following:
Why does $P C l_{3}$ fume in air?

Write down a balanced equation for the hydrolysis of $P C l_{5}$ with heavy water.

Revise with Concepts

Compounds of Phosphorus - PCl3

Compounds of Phosphorus - PCl5

Quick Summary With Stories

Compounds of Phosphorous - Phosphorous trichloride

Compounds of Phosphorous- Phosphorous pentachloride

Identify the incorrect statement related to PCl5​ from the following:

Acetic acid reacts with PCl5​ to form :

In solid state PCl5​ is a :

In solid state PCl5​ exist as an ionic solid [PCl4​]+[PCl6​]− hybridisation state of cation and anion respectively :

Among the following the number of compounds that can react with PCl5​ to give POCl3​ is : O2​,CO2​,SO2​,H2​O,H2​SO4​,P4​O10​

Draw structure and write geometry of PCl3​ and PCl5​.

What happens when PCl5​ is heated?

In the solid state PCl5​ exists as:

Answer the following: Why does PCl3​ fume in air?

Write down a balanced equation for the hydrolysis of PCl5​ with heavy water.