Corey House Synthesis

Q. Thionyl chloride $\left(SOC{l}_2\right)$ is preferred for preparing alkanoyl chloride because

1. side products are gaseous
2. purification of alkanoyl chloride becomes easier
3. $SOC{l}_2$ act as autocatalyst
4. Both (a) and (b)

Q.

In the following reaction, \( R _{2} CuLi \stackrel{ RX }{\longrightarrow} R - R ^{\prime}+ RCu + LiX \text {, the nature of } R \text { and } R ^{\prime} \text { should be } \)

Q. In the following chemical reactions:
$2KI+A2\to KCl+B$
$2KCl{O}_3+B2\to KI{O}_3+C{l}_2$
$A$ and $B$ respectively, are :

1. $C{l}_2,$ $I_2$
2. $I_2,I_2$
3. $C{l}_2,C{l}_2$
4. $I_2,C{l}_2$

Q. Give equations of the following reactions:
(i) Oxidation of propan-1-ol with alkaline $KMn{O}_4$ solution.
(ii) Bromine in $C{S}_2$ with phenol.
(iii) Dilute $HN{O}_3$ with phenol.
(iv) Treating phenol wih chloroform in presence of aqueous $NaOH$.

Q. Sodium nitroprusside when added to an alkaline solution of sulphide ions produces a purple coloured complex. What is the total number of sodium atoms present per molecule in this purple coloured complex?

Q. $ClO{{}_3}^{-}\left(aq\right)+A{s}_2{S}_3\left(s\right)\to C{l}^{-}\left(aq\right)+H_{2}AsO{{}_4}^{-}\left(aq\right)+HSO{{}_4}^{-}\left(aq\right)$

1. None of the above
2. $14ClO{{}_3}^{-}\left(aq\right)+A{s}_2{S}_3\left(s\right)+18H_{2}O\left(l\right)\to 14C{l}^{-}\left(aq\right)+6H_{2}AsO{{}_4}^{-}\left(aq\right)$ $+9HSO{{}_4}^{-}\left(aq\right)+15H^{+}\left(aq\right)$
3. $14ClO{{}_3}^{-}\left(aq\right)+2A{s}_2{S}_3\left(s\right)+20H_{2}O\left(l\right)\to 14C{l}^{-}\left(aq\right)+8H_{2}AsO{{}_4}^{-}\left(aq\right)$$+9HSO{{}_4}^{-}\left(aq\right)+16H^{+}\left(aq\right)$
4. $7ClO{{}_3}^{-}\left(aq\right)+A{s}_2{S}_3\left(s\right)+9H_{2}O\left(l\right)\to 7C{l}^{-}\left(aq\right)+4H_{2}AsO{{}_4}^{-}\left(aq\right)$$+9HSO{{}_4}^{-}\left(aq\right)+15H^{+}\left(aq\right)$

Q. In the reaction:

1. $\frac{molecularweight}{1}$
2. $\frac{molecularweight}{2}$
3. $\frac{molecularweight}{3}$
4. $\frac{molecularweight}{4}$

Q.

$xKMn{O}_4+y{K}_2{C}_2{O}_4+z{H}_{2}S{O}_4⟶aMn{O}_4+bC{O}_2+6K_{2}S{O}_4+8H_{2}O$

Here x, y, z, a and b are respectively

1. 2, 5, 8, 2, 10

2. 2, 4, 9, 4, 10

3. 5, 9, 12, 4, 10

4. None of these

Q.

In the following reaction,
$xM{n}_2{O}_7⟶yMn{O}_2+z{O}_2$ x, y, and z respectively are:

1. 2, 4, 3

2. 2, 3, 4

3. 4, 3, 2

4. None of these

Q.

Assume the following reaction is carried out in acidic medium.
$6e^{-}+C{r}_2{O_7}^{2-}⟶2{Cr}^{3+}+7H_{2}O$

How many $H^{+}$ do we need to add to the LHS to balance the H atoms?

1. 10

2. 6

3. 7

4. 14

Q. $Cl{O}_2+{SbO}_2^{-}\to {ClO}_2^{-}+{Sb\left(OH\right)}_6^{-}$

1. $2Cl{O}_2+{SbO}_2^{-}+2{OH}^{-}+2H_{2}O\to 2{ClO}_2^{-}+{Sb\left(OH\right)}_6^{-}$
2. $2{ClO}_2+5{SbO}_2^{-}+2O{H}^{-}+3H_{2}O\to 2{ClO}_2^{-}+2{Sb\left(OH\right)}_6^{-}$
3. $2Cl{O}_2+{SbO}_2^{-}+3O{H}^{-}+4H_{2}O\to 2{ClO}_2^{-}+3{Sb\left(OH\right)}_6^{-}$
4. None of these

Q. The complete balanced equation in acid medium is:

1. none of the above
2. $3H_{2}S{O}_3+C{r}_2{O}_2^{7-}+8H^{+}\to 3H_{2}S{O}_4+2C{r}^{3+}+4H_{2}O$
3. $4H_{2}S{O}_3+2C{r}_2{O}_2^{7-}+8H^{+}\to 5H_{2}S{O}_4+4C{r}^{3+}+4H_{2}O$
4. $7H_{2}S{O}_3+3C{r}_2{O}_2^{7-}+3H^{+}\to 3H_{2}S{O}_4+5C{r}^{3+}+2H_{2}O$

Q. How many electrons are involved in the following redox reaction?
$C{r}_2{O}_7^{2-}+F{e}^{2+}+C_2{O}_4^{2-}\to C{r}^{3+}+F{e}^{3+}+C{O}_2$ (Unbalanced)

1. $3$
2. $6$
3. $4$
4. $5$

Q. In the coordination compound $K_4\left[Ni\right(CN{)}_4]$, the oxidation state of $Ni$ is :

1. $+1$
2. $-1$
3. $+2$
4. 0

Q. ${VO}_4^{3-}+{Fe}^{2+}⟶{Fe}^{3+}+{VO}^{2+}$

1. ${VO}_4^{3-}+{Fe}^{2+}+6H^{+}⟶{Fe}^{3+}+{VO}^{2+}+3H_{2}O$
2. ${VO}_4^{3-}+3{Fe}^{2+}+6H^{+}⟶{4Fe}^{3+}+{VO}^{2+}+3H_{2}O$
3. None of these
4. $2{VO}_4^{3-}+3{Fe}^{2+}+6H^{+}⟶{4Fe}^{3+}+{VO}^{2+}+3H_{2}O$

Q. Which of the following compound does not gives ppt. with $dil.HCl$?

1. $H{g}_2{\left(N{O}_3\right)}_2$
2. $AgN{O}_3$
3. $Pb{\left(N{O}_3\right)}_2$
4. $Cu{\left(N{O}_3\right)}_2$

Q.

How many electrons should be added to the reactant to balance the atom whose oxidation number is changing?

$C{r}_2{O}_7^{2-}$$⟶$$C{r}^{+3}$

1. 5

2. 4

3. 2

4. 6

Q. $C_2{H}_{5}OH+{MnO}_4^{-}⟶C_2{H}_3{O}^{-}+Mn{O}_2\left(s\right)+H_{2}O$

1. $3C_2{H}_{5}OH+2{MnO}_4^{-}+6O{H}^{-}\to 3C_2{H}_3{O}^{-}+5Mn{O}_2+5H_{2}O$
2. None of these
3. $3C_2{H}_{5}OH+2{MnO}_4^{-}+O{H}^{-}\to 3C_2{H}_3{O}^{-}+2Mn{O}_2+5H_{2}O$
4. $3C_2{H}_{5}OH+2{MnO}_4^{-}+3O{H}^{-}\to 3C_2{H}_3{O}^{-}+9Mn{O}_2+5H_{2}O$

Q. Ethyl bromide reacts with sodium lead alloy to form?

1. Ethane
2. Ethyl sodium
3. Tetraethyl lead
4. Wthene

Q. Alkyl halides react with dialkyl copper reagents to give:

1. Alkanes
2. Alkyl copper halides
3. Alkenes
4. Alkenyl Halides

Q. Lead chloride in treating with potassium iodide gives :

1. red ppt.
2. yellow ppt.
3. white ppt.
4. black ppt.

Q. On carrying out the electrolysis of acidified water, the volume of hydrogen liberated at $STP$ condition is $22.4L$. The volume of oxygen liberated is:

1. $22.4L$
2. $44.8L$
3. $2.24L$
4. $11.2L$

Q. In the balanced equation, the sum of coefficient of $H^{+}$ and $C{O}_2$ is:
${Mn{O}_4}^{-}+C_2{O}_4^{2-}+H^{+}\to M{n}^{2+}+C{O}_2+H_{2}O$

1. $4$
2. $8$
3. $26$
4. $16$

Q.

Assertion : Corey-House reaction can be used to prepare both symmetrical and unsymmetrical alkanes.

Reason : The reaction involves the interaction between lithium dialkyl copper with an alkyl halide both of which may contain even or odd number of carbon atoms.