Find the odd one out in each case and explain your choice.

(i) C₃H₈ , C₅H₁₀, C₂H₆, CH₄

(ii) Formic acid, Nitric acid, Acetic acid, Propanoic acid.

Fill in the blanks with the correct words from the brackets:

Generally ionic compounds exist in (i) …………… [solid/liquid/gas] state. Melting and boiling points of covalent compounds are generally (ii) …………… [low/high]. The general formula for alkane is (iii) …………… (C_nH_2n/C_nH_2n-2/C_nH_2n+2). For alkynes the general formula is (iv) …………… (C_nH_2n/ C_nH_2n-2/C_nH_2n+2)

Write balanced equation for : Acetic acid is warmed with ethanol in the presence of conc. H₂SO₄.

Give chemical equation for :

(i) The laboratory preparation of methane from sodium acetate.

(ii) The reaction of one mole of ethene with one mole of chlorine gas.

(iii) The preparation of ethyne from 1, 2 – dibromoethane.