[3 Mark Question Answer]

Question 13 Marks

Write the structural formulae and IUPAC name of the second and third
homologues.

Answer

Structural formulae and IUPAC name of Second Homologues:
Propyne
$\begin{array}{cc}
\ce{H}\phantom{.......}\\
|\phantom{.......}\\
\ce{H-C-C≡C-H}\\
|\phantom{.......}\\
\ce{H}\phantom{.......}\\
\end{array}$
Structural formulae and IUPAC name of third homologues:
Butyne
$\begin{array}{cc}
\phantom{...............}\ce{H}\phantom{...}\ce{H}\phantom{........}\\
\phantom{...........}|\phantom{...} \phantom{.}|\phantom{....}\\
\ce{H-C≡C-C-C-H}\\
\phantom{...........}|\phantom{...}\phantom{.}|\phantom{....}\\
\phantom{...............}\ce{H}\phantom{...}\ce{H}\phantom{........}\\
\end{array}$

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Question 23 Marks

Give three points to differentiate between saturated and unsaturated hydrocarbons.

Answer

S.No.	Saturated organic comnound	Unsaturated organic comnound
1.	All the four valencies of each carbon atom are satisfied by forming single covalent bonds with carbon and with hydronen atoms.	The valencies of at least two carbon atoms are not fully satisfied by the hydrogen atoms.
2.	Carbon atoms are joined only by a single covalent bond	Carbon atoms are joined by double covalent bonds or by trinle covalent bonds.
3.	Less reactive	More reactive

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Question 33 Marks

How is ethyne prepared in the laboratory?

Answer

Ethyne Is prepared by the reaction of calcium carbide with water
$\ce{CaC2 + 2H2O -> C2H2 + Ca(OH)2}$

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Chemistry [3 Mark Question Answer]

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