What is the difference in terms of molar masses of the second and fourth members of a homologous series?

What is the number of $\sigma$ and $\pi$ bonds in $Pent-1-en-4-yne$?

$A$ straight chain hydrocarbon has the molecular formula $C_8H_{10}$. The hybridisation for the carbon atoms from one end of the chain to the other are respectively $sp^3$,$sp^2$,$sp^2$,$sp^3$,$sp^2$,$sp^2$,$sp$ and $sp$. The structural formula of the hydrocarbon would be

Which of the following is the best stereochemical representation for the reaction between $1$-methylcyclohexene and $NBS$ in aqueous dimethyl sulfoxide $(DMSO)$?

Give distinguishing tests for the following:
$(a)$ Ethane and ethyne (Alkane and Alkyne $RC \equiv CH$)
$(b)$ Ethene and Ethyne (Alkene and Alkyne $RC \equiv CH$)
$(c)$ Dimethyl ethyne and ethyne
$(d)$ Ethane and Ethene (Alkane and alkene)

Predict the product $(A)$ of the following reaction: