Which of the following molecules, in pure form, is/are unstable at room temperature?

Among P, Q, R and S, the aromatic compound(s) is (are)

Which of the following undergo electrophilic substitution reactions faster than benzene?

The total number of stable conformers with non-zero dipole moment for the following compound is/are

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.