How many of the given molecules have zero dipole moment?

cis-$1,2$-dichloroethene, trans-$1,2$-dichloroethene, $1,1$-dichloroethene, trans-$2$-pentene, cis-$2$-pentene, $1$-butyne, trans-$2$-butene, cis-$2$-butene.

How many of the following on reductive ozonolysis will give only glyoxal?

$1,3$-butadiene, ethylene, acetylene, o-xylene, m-xylene, p-xylene, benzene, cyclobutadiene, cyclooctatetraene.

How many of the following species are aromatic in nature?

Cyclopentadienyl cation, cyclopentadienyl anion, tropylium cation, azulene, cyclopropenyl cation, tetrahydrofuran, cyclooctatetraene, furan, cycloheptatriene.

Among the following, the number of aromatic compound(s) is/are

Enter the correct numerical value, (in decimal-notation, rounded-off to the second decimal place, e.g.$6.25, 7.00, -0.33, -0.30, 30.27$).

In the following reaction sequence, the amount of $\mathrm{D}$ (in g) formed with $10$ moles of acetic acid is _____. (Report your answer to the nearest integer)

(The yield ($\%$) corresponding to the product in each step is given in the parenthesis)

${\mathrm{CH}}_3\mathrm{COOH}\stackrel{\mathrm{NaOH}}{\to }\underset{90\%}{\mathrm{A}}\underset{630 \mathrm{K}}{\overset{\mathrm{Soda} \mathrm{lime}}{\to }}\underset{70\%}{\mathrm{B}}\stackrel{{\mathrm{Cl}}_2,\mathrm{h\nu }}{\to }\underset{80\%}{\mathrm{C}}\stackrel{\mathrm{Na},\mathrm{Dry} \mathrm{ether}}{\to }\underset{70\%}{\mathrm{D}}$