Kolbe's Electrolysis for Alkynes

Q.

What is the electrophile in nitration of benzene reaction?

Q. 13. Ethane gas obtained in kolbes. electrolysis of CH3COONa according to the reaction 2CH3COO=CH3-CH3+2CO2+2e What volume of C2H6(g)at STP would be obtained by a current of0.5amp(80 %efficiency) for965 min

Q. Acetylene may be prepared by electrolysis of

1. potassium oxalate
2. potassium fumarate
3. potassium succinate
4. potassium acetate

Q. The acid whose sodium salt on electrolysis gives acetylene is

1. Fumaric acid
2. Succinic acid
3. Oxalic acid
4. Adipic acid

Q. For preparing prop-1-yne in kolbe electrolysis we take

1. 
2. 
3. 
4. All of these

Q. Dipole moment of PCl3Br2 n PCl2Br3?

Q. The nature of the aqueous solution after Kolbe's electrolysis is:

1. Acidic
2. Alkaline
3. Neutral
4. May be acidic, alkaline or neutral

Q. Electrolytic reduction of nitrobenzene in weakly acidic medium gives:

1. aniline
2. nitrosobenzene
3. N-phenylhydroxylamine
4. P-hydroxyaniline

Q. In a set of reaction $m-\text{bromobenzoic acid}$ gave a product $D$. Identify the Product $D$.

1. 
2. 
3. 
4. 

Q. The product (C) of above reaction is:

1. $H_{2}C=C{H}_2$
2. 
3. $HC\equiv CH$
4. 

Q. Hydrolysis of one mole of peroxydisulphuric acid produces:

1. two moles of sulphuric acid
2. two moles of peroxymonosulphuric acid
3. one mole of sulphuric acid and one mole of peroxymonosulphuric acid
4. one mole of sulphuric acid, one mole of peroxymonosulphuric acid, and one mole of hydrogen peroxide

Q. In strongly acidic medium, the electrolytic reduction of nitrobenzene will give which of the following product?

1. aniline
2. nitrosobenzene
3. phenylhydroxylamine
4. p-aminophenol

Q. Both $N{F}_3$ and $NC{l}_3$ are covalent but they differ in the extent of hydrolysis because :

1. $N{F}_3$ is more stable than $NC{l}_3$ and hydrolysis product of $N{F}_3,HOF$, does not exist.
2. dipole moment of $N{F}_3$ is greater than that of $NC{l}_3$.
3. electrongativity of F is greater than that of $Cl$.
4. $Cl$ can expand its octet by using d-orbitals.

Q. For preparing prop-1-yne in kolbe electrolysis we take

1. 
2. 
3. 
4. All of these

Q. The major product of the following reaction is:
$C{H}_{3}C\equiv CH\underset{\left(ii\right)DI}{\overset{\left(i\right)DCl\left(1equiv\right)}{\to }}$

1. $C{H}_{3}CD\left(I\right)CHD\left(Cl\right)$
2. $C{H}_{3}CD\left(Cl\right)CHD\left(I\right)$
3. $C{H}_{3}C{D}_{2}CH\left(Cl\right)\left(I\right)$
4. $C{H}_{3}C\left(I\right)\left(Cl\right)CH{D}_2$

Q. The correct order for the increasing extent of hydrolysis is:

1. $P{O}_4^{3-}<HP{O}_4^{2-}<H_{2}P{O}_4^{-}$
2. $H_{2}P{O}_4^{-}<HP{O}_4^{2-}<P{O}_4^{3-}$
3. $HP{O}_4^{2-}<P{O}_4^{3-}<H_{2}P{O}_4^{-}$
4. $P{O}_4^{3-}<H_{3}P{O}_4^{-}<HP{O}_4^{2-}$

Q.

1. 
2. 
3. 
4. 

Q. In which of the following methods, the number of carbon atoms in alkane (forms as a product) is less than that of the parent compound (reactant)?

1. Reduction of alkyl halide
2. Wurtz reaction
3. Hydrolysis of Griganard reagent
4. Decarboxylation of alkali salt of a fatty acid

Q. Ethyl isocyanide on hydrolysis in acidic medium generates:

1. propanoic acid and ammonium salt
2. ethanoic acid and ammonium salt
3. methylamine salt and ethanoic acid
4. ethylamine salt and methanoic acid

Q. Which is called chromic anhydride?

1. $CrO$
2. ${Cr}_2{O}_3$
3. $Cr{O}_3$
4. $Cr{O}_2$

Q. Neopentyl iodide or 1-iodo pentane with ${CH}_{3}OH$

1. $neo$-pentyl iodide > $1$-iodo pentane
2. $neo$-pentyl iodide < $1$-iodo pentane
3. $neo$-pentyl iodide = $1$-iodo pentane
4. None of these

Q. what is peroxides

Q. In weak acidic medium, the electrolytic reduction of nitrobenzene will give which of the following product?

1. aniline
2. nitrosobenzene
3. phenylhydroxylamine
4. p-aminophenol

Q. The hydrolysis of 2-bromo-3-methyl butane by $S_{N}1$ mechanism gives mainly:

1. 3-Methyl-2-butanol
2. 2-Methyl-2-butanol
3. 2, 2-Dimethyl-1-propanol
4. 2-Methyl-1-butanol

Q.

Here A or B is

1. CH=CH

2. KOH

3. CH₂ =CH₂

4. KNO₃

Q. 3-oxobu†an al +ethylene glyco\overset{H+}{→??

Q. $MgC{l}_2.6H_{2}O$ on heating gives anhydrous $MgC{l}_2$.

1. True
2. False

Q.

Here A or B is

1. CH=CH

2. KOH

3. CH₂ =CH₂

4. KNO₃