The total number of $C-C$ sigma $(\sigma)$ bonds in mesityl oxide $(C_6H_{10}O)$ is $......$. (Round off to the nearest integer).

The hybridization of $C_2$ and $C_3$ in $CH_3-CH=C=CH-CH_3$ is

Which of the following compounds contains carbon atoms with both $sp$ and $sp^2$ hybridization?

The hybridization of carbon atoms in buta-$1,2$-diene is of the type........

Consider a positively charged $C_2H_3$ species in which the positively charged carbon is $sp$-hybridized,the uncharged carbon is $sp^2$-hybridized and an empty $p$-orbital is perpendicular to the $\pi$ system. What is the best description of this cation?

Match the following lists:

List-$I$	List-$II$
$A$. Ethane	$1$. $2 \ sp$ carbons
$B$. Ethylene	$2$. $6 \ sp^2$ carbons
$C$. Acetylene	$3$. $2 \ sp^3$ carbons
$D$. Benzene	$4$. $2 \ sp^2$ carbons
	$5$. $1 \ sp$ and $1 \ sp^2$ carbons