Q$\mathrm{.}17-)$ What is the name of the product formed in the following reaction?

$C{H}_3-C-=C-HNaN{H}_2\{\begin{array}{c}\text{:}[C{H}_3-CH-Cl]\\ C{H}_3\end{array}?$

a$-)4-$methyl$-2-$pentyne

b$-)2-$hexyne c$-)2-$methyl$-2-$pentene

d$-)2-$hexene

Q$\mathrm{.}18-)$ What is the name of the functional group of the product formed in the following reaction?

a$-)$ Ester

b$-)$ Anhydride

c$-)$ Carboxylic acid

d$-)$ Cyclic ketone

Q$\mathrm{.}19-)$ What is the IUPAC name for the following molecule?

A$)2-$bromo$-4-$isopropyl$-3-$methylbutane

B$)2-$bromo$-3,5-$dimethylhexane

C$)3,5-$dimethyl$-2-$bromohexane

D$)2-$bromo$-3-$methyl$-4-$propylbutane

E$)2-$bromo$-5,5,3-$trimethylpentane

Q$\mathrm{.}20-)$ How many chiral carbon atoms can you find in the molecule below?

A$)1$

B$)2$

C$)3$

D$)4$

E$)5$