UP Board Class 11 Chemistry Chapter 9 Hydrogen Multiple Choice Questions

UP Board Class 11 Chemistry Chapter 9 Hydrogen Multiple Choice Questions

Question 1. An alkene (molecular formula : C₅H₁₀) on ozonolysis forms acetone as one of the products. The alkene is—

1. 2-methyl-1-butene
2. 3-methyl-1-butene
3. 2-methyl-2-butene
4. Cyclopentane

Answer: 2.  3-methyl-1-butene

Question 2. Which of the following compounds can be used to prepare both ethylene and acetylene—

1. CH₃CH₂OH
2. BrCH₂CH₂Br
3. CH ₃CH₂Br
4. BrCH₂CH₂OH

Answer: 2. BrCH₂CH₂Br

Question 3. Alkyl chloride on dehydrochlorination produces 2 alkenes (C₆H₁₂) which on ozonolysis form four compounds—

1. CH₃CHO
2. CH₃CH₂CHO,
3. CH₃COCH₃ and
4. (CH₃)₂CHCHO.

The alkenes are—

1. 4-methylpent-2-ene and 2-methylpent-2-ene
2. 2-methyl pent-2-ene and 2,3-dimethyl but-2-ene
3. 4-methylpent-2-en§ and hex-3-ene
4. 2-methylpent-2-ene and hex-3-ene

Answer: 1. 4-methyl pent-2-ene and 2-methyl pent-2-ene

Question 4. The compound that exhibits geometrical isomerism is—

1. C₂H₅Br
2. (CH)₂(COOH)₂
3. CH₃CHO
4. (CH₂)₂(COOH)₂

Answer: 2. (CH)₂(COOH)₂

Question 5

1. X: cis-2-butene and Y: frans-2-butene
2. X: trans-2-butene and Y :cis-2-butene
3. X, Y both are cis-2-butene
4. X, Y both are trans-2-butene

Answer: 1. X: cis-2-butene and Y: frans-2-butene

Question 6. An alkene may be formed from a carbocation if—

1. One H- ion gets eliminated
2. One H+ ion gets added
3. One H+ ion gets eliminated
4. One H- ion gets added

Answer: 3. One H+ ion gets eliminated

Question 7. The number of moles of water produced when one mole acetylene undergoes complete combustion is—

1. 1 mol
2. 2 mol
3. 3 mol
4. 4 mol

Answer: 1.  1 mol

Question 8.   , A, B, C in the above reaction are respectively—

1. CH₃COCH₃, CH₃CHO, CO₂
2. CH₃COCOOH, CH₃COOH, CO₂
3. CH₃CH₂COOH, CH₃CHO, CO₂
4. CH₃COCH₃, CHgCOOH, CO₂

Answer: 4. CH₃COCH₃, CHgCOOH, CO₂

Question 9. The position of the double bond in an alkene can be determined by—

1. Hydrogenation
2. Ozonolysis
3. Hydroxylation
4. Hydroboration

Answer: 2. Ozonolysis

Question 20. Heavy water reacts with calcium carbide to form—

1. CaD₂
2. C₂D₂
3. Ca₂D₂O
4. CD₂

Answer: 2. C₂D₂

Question 21. In case of trisubstituted benzene, if the substituents are different, then the number of isomers will be

1. 5
2. 8
3. 6
4. 10

Answer: 4. 10

Question 22. The chemical formula ofCetane is—

1. C₆H₁₂
2. (CH₃)₃C(CH₂)₁₁CH₃
3. CH₃(CH₂)₁₄CH₃
4. (C₂H₅)₄C

Answer: 3. CH₃(CH₂)₁₄CH₃

Question 23. Which of the following gets converted into an explosive when it is turned into liquid by applying high pressure—

1. Propane
2. n-butane
3. Isobutane
4. Acetylene

Answer: 4. Acetylene

Question 24. The product which is not obtained when ethylene reacts with K3 mixed with Br₂/H₂O is—

1. BrCHCH₂Br
2. BrCH₂CH₂OH
3. HOCH₂CH₂OH
4. BrCH₂CH₂I

Answer: 3. HOCH₂CH₂OH

Question 25. Which of the following does not form a sooty flame—

1. Toluene
2. Benzene
3. Mesitylene
4. Butane

Answer: 4. Butane

Question 26. Which of the following statements is incorrect—

1. Delocalisation of electrons occur between two n bonds in a propadiene molecule
2. Delocalisation of electrons occur between two n bonds in a molecule of 1, 3-butadiene
3. Cumulated polyenes with odd number of double bonds exhibit geometrical isomerism if their terminal groups are different
4. Cumulated polyenes with even number of double bonds exhibit optical isomerism if their terminal groups are different

Answer: 1.  Delocalisation of electrons occur between two n bonds in a propadiene molecule

Question 27. Which of the given is a benzenoid aromatic compound—

1. Anthracene
2. Pyrrole
3. Pyridine
4. Cyclopentadienyl anion

Answer: 1. Anthracene

Question 28. Gas used in Hawker’s lamp for emitting bright light is—

1. Acetylene
2. Ethylene
3. Methane
4. Propane

Answer: 1. Acetylene

Question 29. The compounds which exist as liquids are—

1. C₅H₁₂
2. C₃H₈
3. C₂H₆
4. C₇H₁₆

Answer: 1,4

Question 30. Which of the given can be prepared by Wurtz reaction–

1. 2-methylpropane
2. 2,3-dimethyl butane
3. Hexane
4. All of them

Answer: 2,3

Question 31. Which of the following compounds do not produce acetylene on hydrolysis—

1. CaC₂
2. Al₄C₃
3. Be₂C
4. Zn(CH₄)₂

Answer: 2,3,4

Question 32. Which of the following options are correct with respect to Friedel-Crafts reaction —

1. Alkylation Reagent: CH₂=C₆H₅Cl
2. Solvent: C₆H₅NO₂, CS₂
3. Catalyst: AlCl₃ , H₂SO₄
4. All Of the Above

Answer: 2,3

Question 33. Lewisite and its antidote are—

1. Lewisite ClCH=CHAsC12
2. Antidote 1,1-dimercapto-l-propanol
3. Lewisite CH₂=CHAsCl₂
4. Antidote 2,3-dimercapto-l-propanol

Answer: 1,4

Question 34. Halogenation ofan alkene is a or an—

1. Substitution reaction
2. Elimination reaction
3. Addition reaction
4. Oxidation reaction

Answer: 1,4

Question 35. During detection of unsaturation in an unknown organic compound disappearance of the violet colour of dilute and cold KMn04 solution indicate—

1. Presence of ethylenic unsaturation in the compound
2. The presence of a group in the compound which gets easily oxidised by kmn04
3. Presence of only single covalent bond in the compound
4. All of the above are true

Answer: 1,2

Question 36. Which of the following options is correct—

1. Ortho- or para-orienting: — NR₂, —NHCOCH₃
2. Mete-orienting: —NO₃, —Cl
3. Ortho- or para-orienting: — CF₃, —SO₃H
4. Mete-orienting: —CHO, —COR

Answer: 1,4

Question 37. Which of the following statements are true for Kolbe’s electrolytic method—

1. It is an effective method for preparing symmetrical alkanes
2. Reduction of carboxylate ion occurs at the anode
3. Platinum electrodes are used in this method
4. Methane cannot be prepared by this method

Answer: 1,3,4

Question 38.   In this reaction, X and Y are-

1. X = CH₃COOH
2. X = HCOOH
3. F = CH₃COONa
4. Y = C₂H₅COONa

Answer: 1,3