Solution of 0.1 N NH₄OH and 0.1 N NH₄Cl has pH 9.25. Then find out pK_b of NH₄OH

The percentage of C, H and N in an organic compound are 40%, 13.3% and 46.7% respectively then empirical formula is

Geometrical isomers differ in

IUPAC name of the following is

CH₂ $$=$$ CH $$-$$ CH₂ $$-$$ CH₂ $$-$$ C $$ \equiv $$ CH