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Question

Calculate total number of valence electrons in CH3CH2Cl :

A
34
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B
20
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C
17
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D
38
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Solution

The correct option is B 20
The atomic number of carbon =6
Electronic configuration of Carbon is: [He] 2s2 2p2
Number of valence electrons: 4
Similarly, the number of valence electrons in Hydrogen (H) and Chlorine (Cl) are 1 and 7 respectively.In CH3CH2Cl, we have 2 carbon atoms, 5 hydrogen atoms and one chlorine atom. Hence, total number of valence electrons in CH3CH2Cl=4×2+1×5+7=20

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