Question 71 : Calcium carbide reacts with water to produce
1. none of above
2. nil
3. acetylene
4. ethane
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Question 72 : The carbon, carbon bond lengths in benzene are A°
1. 1.54
2. 1.397
3. 1.34
4. none of above
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Question 73 : Methane is the ______ component of natural gas:
1. between
2. major
3. minor
4. none of'above
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Question 74 : Removal of __ from a molecule is called dehydration.
1. none of above
2. Acid
3. base
4. Water
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Question 75 : Ethene is slightly_________ in taste.
1. sweet
2. none of above
3. bitter
4. tasteless
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Question 76 : The hydrocarbons which contain at least_________benzene ring in their molecules are, called aromatic hydrocarbon.
1. 2
2. 3
3. 1
4. none of above
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Question 77 : Chlorination of alkanes is an example of________ reaction.
1. none of above
2. elimination
3. redical
4. free redical
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Question 78 : The hydrocarbon in which all the four valencies of carbon atoms are fully utilized are called________
1. alkanes
2. alkynes
3. alkenes
4. none of above
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Question 79 : The old name of alkenes was
1. nil
2. olefin
3. paraffins
4. none of above
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Question 80 : __________ carbide reacts with water to give methane
1. Calcium
2. Aluminium
3. none of above
4. 1 and 2
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