Question 51 : The angle strain in cyclobutane is
1. 24°44?
2. 29°16?
3. 19°22?
4. 9°44?
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Question 52 : Which one of these is NOT TRUE for benzene?
1. There are three carbon-carbon single bonds and three carbon-carbon double bonds
2. Heat of hydrogenation of benzene is less than the theoretical value
3. The bond angle between carbon-carbon bonds is 120°
4. It forms only one type of monosubstituted product
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Question 53 : One mole of a symmetrical alkene on ozonolysis gives two moles of an aldehyde having a molecular mass of 44 u. The alkene is
1. Propene
2. 1-butene
3. Ethane
4. 2-butene
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Question 54 : The synthesis of 3-octyne is achieved by adding a bromoalkane into a mixture of sodium amide and an alkyne. The bromoalkane and alkyne respectively are
1. BrCH₂CH₂CH₂CH₃ and CH₂CH₂C ? CH
2. BrCH₂CH 2CH₂CH₂CH₃ and CH₃CH₂C ? CH
3. BrCH₂CH₂CH₂CH₂CH₃ and CH₂C ? CH
4. BrCH₂CH₂CH₃ and CH₃CH₂CH₂C ? CH
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Question 55 : A dibromo derivative of an alkane reacts with sodium metal to form an alicyclic hydrocarbon. The derivative is ______.
1. 2, 2-dibromobutane
2. 1, 4-dibromobutane
3. 1, 1-dibromopropane
4. 1, 2-dibromoethane
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Question 56 : Ozonolysis of an organic compound 'A' produces acetone and propionaldehyde in equimolar mixture. Identify 'A' from the following compounds
1. 2 - Methyl - 2 - pentene
2. 2 - Methyl - 1 - pentene
3. 1 - Pentene
4. 2 - Pentene
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Question 57 : Ozonolysis of an organic compound gives formaldehyde as one of the products. This confirms the presence of
1. Two ethylenic double bonds
2. A vinyl group
3. An acetylenic triple bond
4. An isopropyl group
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Question 58 : Ethyl benzene CANNOT be prepared by ______.
1. Wurtz-Fittig reaction
2. Clemmensen reduction
3. Wurtz reaction
4. Friedel-Crafts reaction
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Question 59 : Among the following compounds the one that is most reactive towards electrophilic nitration is
1. Toluene
2. Benzene
3. Benzoic Acid
4. Nitrobenzene
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Question 60 : Which branched chain isomer of the hydrocarbon with molecular mass 72u gives only one isomer of mono substituted alkyl halide?
1. Isohexane
2. Neopentane
3. Neohexane
4. Tertiary butyl chloride
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