Distinguishing Test of Terminal and Non Terminal Alkynes
Trending Questions
Q. When ethyne is passed through a red hot tube, is formed
- Benzene
- Ethane
- Cyclohexane
- Methylbenzene
Q. Benzaldehyde is formed when benzene is treated with CO and HCl in presence of AlCl3. Name of the reaction is:
- Gattermann–Koch reaction
- Friedel craft reaction
- Rosenmund reaction
- Stephen reaction
Q. Acetylene reacts with ammoniacal AgNO3 forming
- Silver acetylene
- Silver acetate
- Disilver acetylide.
- Silver mirror
Q. Identify a reagent from the following list which can easily distinguish between 1-butyne and 2-butyne.
- Br2, CCl4
- H2, Pd, BaSO4
- [Ag(NH3)2]NO3
- Dilute H2SO4, HgSO4
Q. Which will undergo reaction with ammonical AgNO3?
- CH3−CH2−CH2−CH=CH−CH3
- CH3−CH=CH−C≡CH
- CH3−CH2−CH=CH−CH2−CH3
- CH2=CH−CH2−CH3
Q. The suitable reagent for the following conversion?
i.e. CH3−C≡C−CH3R⟶trans-alkene:
i.e. CH3−C≡C−CH3R⟶trans-alkene:
- H2/Pd/CaCO3
- Na/NH3(l)
- Na/dry ether
- Cr2O3/Al2O3
Q. Assertion (A): The carbonate of lithium decomposes easily on heating to form lithium oxide and CO2
Reason (R): Lithium being very small in size polarises large carbonate ions leading to the formation of more stable Li2O and CO2.
Reason (R): Lithium being very small in size polarises large carbonate ions leading to the formation of more stable Li2O and CO2.
- A is not correct but R is correct.
- Both A and R are correct and R is the correct explanation of A.
- Both A and R are not correct.
- Both A and R are correct and R is not the correct explanation of A.
Q.
Give the products formed when:
When Ammoniacal Cuprous chloride is added to Ethyne_______.
Q. Which is the most suitable reagent among the following to distinguish compound (iii) from rest of the compounds?
(i) CH3−C≡C−CH3
(ii) CH3−CH2−CH2−CH3
(iii) CH3−CH2−C≡CH
(iv) CH3−CH=CH2
(i) CH3−C≡C−CH3
(ii) CH3−CH2−CH2−CH3
(iii) CH3−CH2−C≡CH
(iv) CH3−CH=CH2
- Ammonical silver nitrate
- Bromine in carbon tetrachloride
- Bromine in acetic acid
- Alkaline KMnO4
Q.
What compound of sulfur is obtained when concentrated oxidizes ?
Q. Select the incorrect statement regarding terminal alkynes.
- Methylacetylene is an example of terminal alkyne
- Terminal alkynes are more acidic when compared with alkenes
- Terminal alkynes are not as acidic as alkanes
- These have a replacable acidic hydrogen atom
Q. ALindlar′s←−−−−−CatalystR−C≡C−RBirch reduction⟶B
Where, A and B are geometrical isomers (R−CH=CH−R).
Choose the correct option from the following:
Where, A and B are geometrical isomers (R−CH=CH−R).
Choose the correct option from the following:
- A is trans, B is cis
- A and B both are cis
- A and B both are trans
- A is cis, B is trans
Q. In the following reaction, the alkene affords the compound 'B'
CH3CH=CHCH3+O3Zn−−→H2OB
The compound B is:
CH3CH=CHCH3+O3Zn−−→H2OB
The compound B is:
- CH3COCH3
- CH3CH2COCH3
- CH3CHO
- CH3CH2CHO
Q.
Will CCl4 give white precipitate of AgCl on heating it with silver nitrate? Give reason for your answer.
Q. With reference to the scheme given, which of the given statement(s) about T, U, V and W is/are correct?
- T is soluble in hot aqueous NaOH
- U is optically active
- Molecular formula of W is C10H18O4
- V gives effervescence on treatment with aqueous NaHCO3.
Q. Which will undergo reaction with ammonical AgNO3?
- CH3−CH=CH−C≡CH
- CH3−CH2−CH2−CH=CH−CH3
- CH3−CH2−CH=CH−CH2−CH3
- CH2=CH−CH2−CH3
Q. Which one of the following has the highest dipole moment?
(i)CH2Cl2(ii)CHCl3(iii)CCl4
(i)CH2Cl2(ii)CHCl3(iii)CCl4
Q. Which of the following is used to distinguish ethylene and acetylene ?
- Ammoniacal cuprous chloride
- Conc. H2SO4
- Bromine water
- Alkaline KMnO4
Q. Hydrogenation of the adjoining compound in the presence of poisoned palladium catalyst gives:
- An optical active compound
- An optical inactive compound
- A racemic mixture
- A diastereomeric mixture
Q. End products of the following sequence of reactions are:
Q. Which one of the following do not give Birch reduction?
- But-1-yne
- Hex-1-yne
- Hex-2-yne
- (a) and (b) above.
Q.
_______ salt of sodium contains 10 molecules of water of crystallization.
Q. An organic compound A (C10H20) on reductive ozonolysis gives 2-methylbutanal. Based on this information answer the compound (A) :
Q. The distinguishing test for triple bond containing acidic hydrogen is
- [Cu(NH3)2]+OH−
- Br2 in CCl4
- Alkaline KMnO4
- AlCl3
Q.
A tertiary alcohol H upon acid catalyzed dehydration gives a product I. Ozonolysis of I leads to compounds J and K.Compound J upon reaction with KOH gives benzyl alcohol and a compound L, whereas K on reaction with KOH gives only M.
The structures of compounds J, K and L respectively, are
- PhCOCH3, PhCH2COCH3 and PhCH2COO−K+
- PhCHO, PhCH2CHO and PhCOO−K+
- PhCOCH3, PhCH2CHO and CH3COO−K+
- PhCHO, PhCOCH3 and PhCOO−K+
Q. CoSO4Cl.5NH3 exists in two isomeric forms 'A' and 'B'. Isomer 'A' reacts with AgNO3 to give white precipitate but dose not react with BaCl2. Isomer 'B' gives white precipitate with BaCl2 but dose not react with AgNO3. Answer the following questions.
i. Identify 'A' and 'B' and write their structural formulas.
ii. Name the type of isomerism involved.
iii. Give the IUPAC name of 'A' and 'B'.
i. Identify 'A' and 'B' and write their structural formulas.
ii. Name the type of isomerism involved.
iii. Give the IUPAC name of 'A' and 'B'.
Q. Which of the following compound on reaction with O3/H2O produces Butanoic acid and formic acid ?
- 2-Pentyne
- Hex-3-yne
- Hex-2-yne
- 1-Pentyne
Q.
When treated with ammoniacal cuprous chloride, which one among the following forms copper derivative
C2H6
C2H4
C6H6
C2H2
Q. Which of the following alkyne yields butanoic acid as the only product on treatment with ozone followed by hydrolysis?
- 1-Butyne
- 4-Octyne
- 2-Hexyne
- All of the above.
Q.
Write the free radical mechanism for the polymerisation of ethene.