Physical Properties of Alkynes

Q. Which of the following isomers has the lowest dipole moment?

1. Cis-2-butene
2. Trans-2-butene
3. 1-Butene
4. None of the above

Q. Find the structure of Picric acid:

1. 
2. 
3. 
4. 

Q. When 2-butyne is treated with $H_2/\text{Lindlar's}$ catalyst, compound X is produced as the major product and when treated with Na/liq. $N{H}_3$ it produces Y as the major product. Which of the following statements is correct?

1. Y will have higher dipole moment and lower boiling point than X
2. X will have higher dipole moment and higher boiling point than Y
3. Y will have higher dipole moment and higher boiling point than X
4. X will have lower dipole moment and lower boiling point than Y

Q. N phenyl hydroxylamine is obtained when nitro benzene is reacted with SN/HCl Zn/NH4Cl As2O3/NaOH Zn/NaOH

Q. $K_{2}C{r}_2{O}_7$ on heating with aqueous $NaOH$, gives:

1. $Cr{O}_4^{2-}$
2. $Cr(OH{)}_3$
3. $C{r}_2{O}_7^{2-}$
4. $Cr(OH{)}_2$

Q. 2 chlorobu†an e reaction with potassium tert butoxid

Q. 36.CH2CH2I is treated with alc. KOH formed X and again it treated with Br2 then formed Y and it treated with KCN formed Z then What is Z in this reaction.

Q. The correct order of C - H bond length in $C{H}_3-C{H}_3,C{H}_2=C{H}_2$ and $CH\equiv CH$ is:

1. $C{H}_3-C{H}_3<C{H}_2=C{H}_2<CH\equiv CH$
2. $C{H}_2=C{H}_2<C{H}_3-C{H}_3<CH\equiv CH$
3. $CH\equiv CH<C{H}_2=C{H}_2<C{H}_3-C{H}_3$
4. all are equal

Q.

The polymer used as electrodes in batteries is

1. polythene

2. polypropene

3. polyacetylene

4. poly vinyl chloride

Q. Choose the incorrect statement regarding dihydrogen.

1. Dihydrogen is a colorless, tasteless and odourless gas.
2. It is soluble in water.
3. It is highly combustible.
4. None of the above

Q. Picric acid is:

1. 
2. 
3. 
4. 

Q. Choose the correct statement(s) regarding alkynes :

1. All alkynes are gases at room temperature.
2. Alkynes are colourless
3. Alkynes are highly polar in nature.
4. Except ethyne, alkynes are odourless.

Q. Which of the following improperly describes the physical property of an alkyne?

1. Relatively non-polar
2. Insoluble in alcohols and ethers
3. less dense than water
4. Nearly insoluble in water

Q. Hydrolysis of alkyl nitriles for preparing carboxylic acid requires:

1. Acidic condition
2. Alkaline condition
3. Any of the above (a) and (b)
4. Both are simultaneously necessary

Q. Choose the correct statment(s) for alkynes :

1. $\text{Boiling point}\propto \frac{1}{\text{Molar mass}}$
2. $\text{Melting point}\propto \text{Molar mass}$
3. Density of alkynes increases with the increase in their molar mass
4. $\text{Boiling point}\propto \frac{1}{\text{Van der Waals force}}$

Q. With the increase in the number of Halogen atoms,
$C{H}_{3}ClC{H}_{2}C{l}_{2}CHC{l}_{3}CC{l}_4$
the boiling point

1. Increases
2. Decreases
3. Becomes denser, settles at the bottom and doesn't boil
4. No change at all

Q. How hyperconjugation decreases the heat of hydrogenation and how heat of hydrogeation is to do with the stability of alkenes. Please give a detailed explanation.

Q. Benzylamine and aniline can be distinguished by Which is correct option- Hno2 acid or Br2 water?

Q. The C - Cl bond length in chlorobenzene is shorter than that in $C{H}_3-Cl$ because

1. Cl is attached to $s{p}^3$ hybridised C atom in $C{H}_3-Cl$ and attached to $s{p}^2$ hybridised C atom in chlorobenzene
2. Cl is attached to $s{p}^2$ hybridised C atom in $C{H}_3-Cl$ and attached to $s{p}^2$ hybridised C atom in chlorobenzene
3. Cl is attached to $s{p}^2$ hybridised C atom in $C{H}_3-Cl$ and attached to $s{p}^3$ hybridised C atom in chlorobenzene
4. Cl is attached to $s{p}^3$ hybridised C atom in $C{H}_3-Cl$ and attached to $s{p}^3$ hybridised C atom in chlorobenzene

Q.

Which among the following has carbon as the positive electrode?

1. Leclanche

2. Bichromate cell

3. Dry cell

4. All of the above

Q. 41 What is the difference between Chlorophenylmethane and Chloromethyl benzene?

Q. Phenol on treatment with dimethyl sulphate in presence of $NaOH$:

1. Phenate
2. Anisole
3. Diphenyl ether
4. Diethyl ethe

Q. Which of the following isomers has the lowest dipole moment?

1. Cis-2-butene
2. Trans-2-butene
3. 1-Butene
4. None of the above

Q. 31.mixture of carbon dioxide and carbon monoxide is passed over red hot graphite when 1 ole of mixture changes to 33.6L (converted at STP) hence mole fraction of carbon dioxide in the mixture is

Q.

Solubilitity of alkynes in H₂O is more than their corresponding alkanes and alkenes - True or False?

1. True
2. False

Q.

What is a disadvantage of Lithium batteries?

Q.

What ppm does ${\mathrm{H}}_2\mathrm{S}$ stop smelling?

Q.

The most volatile compound is

1. 2, 2-dimethyl propane

2. 2-methyl butane

3. Isobutane

4. n-pentane

Q. Arrange following in decreading order of Kb(ebulleoscopic cons†an t) a. water b. benzene c. chloroform d. carbon tetrachloride (CCl4

Q. Which compound has lowest melting point?

1. Ethane
2. Ethene
3. Ethyne
4. All have approximately equal melting points.