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Question

The number of valence electrons in CH3CH2Cl is:

A
14
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B
12
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C
18
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D
20
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Solution

The correct option is D 20
Atomic number of carbon = 6
Electronic configuration of Carbon is [He]2s22p2
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 a chlorine atom.

Hence, the total number of valence electrons in CH3CH2Cl=(4×2)+(1×5)+7=20

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