Question

smallest possible alkane with ethyl group as substituent possess molecular mass
A)16
B)72
C)84
D)100

Answer 1

Answer : 100

In 100, there are 8 twelve's (12*8=96). Hydrogen s will possess some molecular formula. The structural formula will be

CH3- CH-CH2-CH2-CH2-CH3

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CH2- CH3. The molecular mass= 100.