In a class, a teacher asked students to write the molecular formula of oxygen Shamita wrote the formula as O2 and Priyanka as O. which one is correct? State the reason. (AS-1)

Write all possible isomers with the molecular formula C_(4)H_(10)O and name them.

Calculate the Molecular formula unit mass of Na_(2)O , given atomic masses of Na = 234 and O = 164

What is homologous series of carbon compounds ? Write the molecular formula of two consecutive members of homologous series of aldehydes. State which part of these compounds determines their (i) physical and (ii) chemical properties.

A compound on analysis gave the following percentage composition: Na=14.31% S = 9.97%, H = 6.22%, O = 69.5%, calcualte the molecular formula of the compound on the assumption that all the hydrogen in the compound is present in combination with oxygen as water of crystallisation. Molecular mass of the compound is 322 [Na = 23, S = 32, H = 1, 0 = 16].

Empricial formula of a compound is CH_(2)O and its molecular mass is 90, the molecular formula of the compound is

An aldehyde and a ketone can be represented by the same molecular formula, say C_3H_6O . Write their structures and name them. State the relation between the two in the language of science.

An organic compound having the molecular formula C_8H_10 O on being heated with I_2 and dilute NaOH gives a yellow precipitate. The expected compound is :