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)

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.

Define isomerism. Give the IUPAC name of the isomer C₄H₁₀ which has a branched chain.

Select the correct answer - The organic compound, which gives a red precipitate with ammoniacal cuprous chloride and undergoes an addition reaction –

A: Ethane
B: Ethene
C: Ethyne
D: Ethanol