In the series, ethane , ethylene & acetylene, the carbon-hydrogen bond length is :
equal in all the three
largest in ethane
smallest in ethylene
largest in acetylene
A
equal in all the three
B
largest in ethane
C
smallest in ethylene
D
largest in acetylene
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Solution
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In ethane (CH3CH3), C−H bond length is 111.0 pm.
In ethylene (CH2=CH2), =C−H bond length is 110.3 pm.
In acetylene (CH≡CH) , ≡C−H bond length is 108 pm.
So order of C−H bond length is as follows:
ethane > ethylene > acetylene
So answer is B.
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