Question

Within the alkali metals atomic size is ...................... 2. Which of these is an sp-hybridized compound. A. C2H2 B. C2H6 C. CH4 D. C2H4.

Answer 1

Answer on Question#41491-Chemistry-Inorganic Chemistry

Questions

1. Within the alkali metals atomic size is ...

2. Which of these is an sp-hybridized compound.

A. $\mathrm{C}_{2} \mathrm{H}_{2}$

B. $\mathrm{C}_{2} \mathrm{H}_{6}$

C. $\mathrm{CH}_{4}$

D. $\mathrm{C}_{2} \mathrm{H}_{4}$

Answers

1. Within the alkali metals atomic size is the highest among all elements, because alkali metals have only one electron on their outermost electron shell and, consequently, the attraction force between the outermost shell and nucleus is low. Within the alkali metals atomic size increases going down the group due to increase of the number of electron shells.

2. Correct answer is A. $\mathrm{C}_{2} \mathrm{H}_{2}$

Those compounds involve sp-hybridized carbons, which have triple bonds in its structure. All alkynes of general formula $\mathrm{C}_{\mathrm{n}} \mathrm{H}_{\mathrm{n}}$ involve sp-hybridized carbons.

$\mathrm{C}_{2} \mathrm{H}_{2}$ – acetylene is the first member of alkynes family. Its structure is $\mathrm{H}-\mathrm{C} \equiv \mathrm{C}-\mathrm{H}$.

B. $\mathrm{C}_{2} \mathrm{H}_{6}$ and C. $\mathrm{CH}_{4}$ are alkanes, whose general formula is $\mathrm{C}_{\mathrm{n}} \mathrm{H}_{2 \mathrm{n} + 2}$. They involve $\mathfrak{sp}^{3}$-hybridized carbons only. And D. $\mathrm{C}_{2} \mathrm{H}_{4}$ belongs to alkenes, whose general formula is $\mathrm{C}_{\mathrm{n}} \mathrm{H}_{2 \mathrm{n}}$, and which involve $\mathfrak{sp}^{2}$- and $\mathfrak{sp}^{3}$-hybridized carbons.

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