Oxidative Hydroboration of Alkynes

Q. When ethanal and propanal are heated in presence of dilute $NaOH$, then the possible product(s) formed in the reaction is/are

1. $2-$Methylbut$-2-$enal
2. $2-$Methylpent$-2-$enal
3. Pent$-2-$enal
4. All of the above

Q. The major cross aldol product of the following reaction is :
$C{H}_{3}CHO+C{H}_{3}C{H}_{2}CHO\underset{\left(ii\right)△}{\overset{\left(i\right)NaOH}{\to }}$

1. $C{H}_{3}C{H}_{2}C{H}_{2}OH$
2. 
3. $C{H}_{3}C{H}_{2}CH=CH-C{H}_{2}OH$
4. 

Q. (X) is the product of cross aldol condensation between benzaldehyde $\left(C_6{H}_{5}CHO\right)$ and acetone. What is its structure?

1. $C_6{H}_5-CH=C-(C{H}_3{)}_2$
2. 
3. $C_6{H}_5-CO-C{H}_2-C=(C{H}_3{)}_2$
4. None of these

Q. Which of the following can give aldol reaction with $dil.NaOH$ ?

1. $C{H}_{3}CHO$
2. $C{H}_{3}C{H}_{2}C{H}_{2}CHO$
3. $C{H}_{3}C{H}_{2}CHO$
4. $PhCHO$

Q.

What is the end product of the following sequences of operations

1. Methyl alcohol

2. Acetaldehyde

3. C₂ H₅ OH

4. C₂ H₄

Q.

What is the end product of the following sequences of operations

1. Methyl alcohol

2. Acetaldehyde

3. C₂ H₅ OH

4. C₂ H₄

Q.
What is not true regarding the products?

1. Product $I$ and $II$ are position isomers
2. Product $I$ and $II$ contains the same number of $s{p}^3$ and $s{p}^2$ carbon atoms
3. The yield of the product $I$ and $II$ is same
4. Reaction obeys Saytzeff rule

Q. Chlorobenzene can be prepared by reacting aniline with :

1. hydrochloric acid
2. cuprous chloride
3. chlorine in presence of anhydrous aluminium chloride
4. nitrous acid followed by heating with cuprous chloride

Q. Which of the possible compound will be formed in the following sequence of reaction?
$C{H}_2=C{H}_2\stackrel{HBr}{⟶}X\stackrel{Hydrolysis}{⟶}Y\stackrel{N{a}_{2}C{O}_3}{\underset{I_{2}excess}{⟶}}Z:$

1. $C_2{H}_{5}Br$
2. $C_2{H}_{5}OH$
3. $CH{I}_3$
4. $C{H}_{3}CHO$

Q.
From the given reaction,
$x=\text{Total number of possible alkene(s) including geometrical isomers}y=\text{Number of products formed when major product}\text{of the reaction is treated with}{H}_2/Ni$
Find $x+y$.

Q. Choose the sequence of steps that describes the best synthesis of $1-$butene from ethanol :

1. (1) $NaC\equiv CH$ ; (2) $H_2,LindlarPd$
2. (1) $NaC\equiv CH$ ; (2) $Na,N{H}_3$
3. (1) $HBr,heat$ ; (2) $NaC\equiv CH$ ; (3) $H_2,LindlarPd$
4. (1) $HBr,heat$ ; (2) $KOC{\left(C{H}_3\right)}_3,DMSO$ ; (3) $NaC\equiv CH$ ; (4) $H_2,Lindlarcatalyst$

Q. An isomer of the complex $CoBrC{l}_2\left(en{)}_2\right(H_{2}O)$, on reaction with concentrated $H_{2}S{O}_4$ (dehydrating agent), suffers no loss in weight and on reaction with $AgN{O}_3$ solution it gives only white precipitate, which is soluble in $N{H}_3$ solution.

The correct formula of the complex is:

1. $\left[CoBr\right(H_{2}O\left)\right(en{)}_2]C{l}_2$
2. $\left[CoCl\right(en{)}_2\left(H_{2}O\right)]BrCl$
3. $\left[CoBrCl\right(en{)}_2]Cl.H_{2}O$
4. $\left[CoC{l}_2\right(en{)}_2]Br.H_{2}O$

Q. The correct statement(s) about the following reaction sequence is(are):
$\underset{\left(C_9{H}_{12}\right)}{\text{Cumene}}\underset{\left(ii\right)H_3{O}^{+}}{\overset{\left(i\right)O_2}{\to }}P+\text{Acetone}$

$P\underset{ii.H^{+}/H_{2}O}{\overset{i.CHC{l}_3/NaOH}{\to }}\underset{\text{(major)}}{Q}+\underset{\text{(minor)}}{R}Q\underset{NaOH}{\overset{PhC{H}_{2}Br}{\to }}S$

1. R is steam volatile
2. Q gives dark violet colouration with $1\%$ aqueous $FeC{l}_3$ solution
3. S gives yellow precipitate with 2, 4-dinitrophenylhydrazine
4. S gives dark violet colouration with $1\%$ aqueous $FeC{l}_3$ solution

Q. Which of the following reagent gives same reduction product when reacts with propionaldehyde and acetone?

1. $Na-Hg/H_{2}O$
2. $LiAl{H}_4$
3. $Ni/H_2$
4. $Zn-Hg/Conc.HCl$

Q. In the following reaction, A is an intermediate while B is the product. A and B respectively are:

1. 
2. 
3. 
4. 

Q. Predict product(s) of the following reaction, is structure____

Q. Ethylene, when subjected to hydroxylation in the presence of Baeyer's reagent, gets oxidized to:

1. glyoxal
2. epoxyethane
3. glycol
4. $C{O}_2$ and $H_{2}O$

Q. Alkynes on reduction with sodium in liquid ammonia form trans alkenes . Will the butene thus formed on reduction of $2$-butyne show the geometrical isomerism ?

Q. Ethyl mercaptan is prepared by the reaction of the following, followed by hydrolysis:

1. $C_2{H}_{5}MgBr+{SO}_2$
2. $C_2{H}_{5}MgBr+H_{2}S$
3. $C_2{H}_{5}MgBr+{CS}_2$
4. $C_2{H}_{5}MgBr+S$

Q. In the following reaction, A is an intermediate while B is the product. A and B respectively are:

1. 
2. 
3. 
4. 

Q. Addition of ethanol aqueous, to the benzyl chloride does not increase the rate of the
hydrolysis but changes only the composition of the final products. This indicates that the reaction is proceeding through:

1. $S_{N}1$ mechanism
2. $S_{N}2$ mechanism
3. $S_{E}1$ mechanism
4. $S_{E}2$ mechanism

Q. A $0.13$ g of a specimen containing $Mn{O}_2$ is treated with iodide ions. If iodine liberated requires $30.0$ mL of $0.075M$ solution of $N{a}_2{S}_2{O}_3$, the percentage of $Mn{O}_2$ in the mineral is:

1. $75.3\%$
2. $85.3\%$
3. $95.3\%$
4. none of the above

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.

The structure of the compound P is:

1. 
2. 
3. 
   
4. 

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.

The structure of the compound Q is:

1. 
2. 
3. 
4. 

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.

The structure of the compound P is:

1. 
2. 
3. 
   
4.