Select the molecules where all bonds are single covalent bonds from the given list. O2, N2, CH4, CO2, NH3
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A.
NH3 and CH4
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B.
O2 and CH4
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C.
CO2, CH4 and NH3
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D.
N2 and NH3
Correct Answer:
A. NH3 and CH4
Explanation:
The molecules NH3 (ammonia) and CH4 (methane) consist entirely of single covalent bonds. In methane, a central carbon atom forms four single bonds with four hydrogen atoms. In ammonia, a central nitrogen atom forms three single bonds with three hydrogen atoms. In contrast, O2 contains a double bond, N2 contains a triple bond, and CO2 contains two double bonds. Therefore, the only pair from the options provided that contains exclusively single covalent bonds is NH3 and CH4.
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