Carbene

Q. An ester (A) with mol. formula $C_9{H}_{10}{O}_2$ was treated with an excess of $C{H}_3–MgBr$ followed by hydrolysis and the product so formed was treated with $H_{2}S{O}_4$ to give an olefin (B). Ozonolysis of (B) gave a ketone with molecular formula $C_8{H}_{8}O,$ which shows the iodoform test.
The structure of (A) is:

1. $C_6{H}_{5}COO{C}_2{H}_5$
2. $C{H}_{3}COC{H}_{2}CO{C}_6{H}_5$
3. $C{H}_{3}O-C_6{H}_4-COC{H}_3$
4. $C_6{H}_{5}COO{C}_6{H}_5$

Q. The compound X (given below) is treated with 2 equivalents of $CHB{r}_3$ in $KOH$, the possible products formed are:

1. 
2. 
3. 
4. 

Q.

Which of the following are the methods of formation of carbene?

1. 

2. 

3. 

4. 

Q.

Which of the following is incorrect for carbene?

1. They are reactive

2. They have six electrons in outermost shell

3. They are positively charged

4. None of these

Q. An acyclic hydrocarbon $P$, having molecular formula $C_6{H}_{10}$, gave acetone as the only organic product through the following sequence of reactions, in which $Q$ is an intermediate organic compound.

1. d
2. a
3. c
4. b

Q. Find the order of reactivity of labelled hydrogen with $NaN{H}_2$?

1. $\text{1 > 2 > 3}$
2. $\text{3 > 2 > 1}$
3. $\text{3 > 1 > 2}$
4. $\text{2 > 3 > 1}$

Q. The hydrolysis of ethyl acetate:

1. Third order
2. Zero order
3. Pseudo first order
4. Second order

Q. The eqivalent weight of $C{H}_4$ in the reaction $C{H}_4+2O_2\to C{O}_2+2H_{2}O$ is? $[M=mol.wt]$

1. $\frac{M}{8}$
2. $\frac{M}{12}$
3. $\frac{M}{16}$
4. $\frac{M}{4}$

Q. Which of the following $C_6{H}_6$ compounds has a single set of structurally equivalent hydrogen atoms?

1. I and II
2. I and IV
3. I and V
4. I, II and III

Q. Alkaline hydrolysis of an ester is called as ________

1. neutralisation
2. esterification
3. polymerisation
4. saponification

Q. Assertion :Propyne is more reactive than propene towards electrophilic addition of $HBr$ Reason: Propyne has greator electron density avaliable for electrophile due to two pi-bonds, therefore more electrophilic

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Then the reaction is

1. Bimolecular and of first order
2. Pseudo-bimolecular
3. Pseudo—unimolecular
4. Bimolecular and of second order

Q. Borazine, also known as inorganic benzene, can be prepared by the reaction of $3$-equivalents of $“X”$ with 6-equivalents of $“Y”$. $“X”$ and $“Y”$, respectively are:

Q. The number of equivalents for the following molecules are given as
(a) $1.6$ g $O_2$ gas $=0.2$
(b) $0.49$ g $H_{2}S{O}_4$ $=0.01$
(c) $1.80$ g $H_{2}O$ $=0.2$
(d) $1.6$ g $C{H}_4$ $=0.4$
If true enter 1, else enter 0.