CnH2n+1
CnH2n
CnH2n+2
CnH2n-2
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Please there is different between Alkyl group and Alkyne group.
Alkyl group = CnH2n 1 e.g. Methyl, ethyl
but
Alkyne group = CnH2n-2
so the answer is correct...

Methly=CH3....For alkyl groups. CnH2n+1...when n =1, we get C1H(2x1)+1..which gives CH3-methyl

The text is a question from a Chemistry JAMB 2004 exam paper. It asks why transition metals possess variable oxidation states. The options are A. Electrons in the d orbitals B. Electron in the s orbitals C. A variable number of electrons in the p orbitals D. Partially filled p orbitals. The correct answer is A. Electrons in the d orbitals. Transition metals possess variable oxidation states because they have incompletely filled d-orbitals which can participate in bond formation by losing or sharing electrons with other atoms or ions.




