The number of possible alkynes with the molecular formula $C_5H_8$ is

The correct order of acidity of the following compounds is

$I. CH_3-C \equiv CH$

$II. F_3C-C \equiv CH$

$III. CH_3-C \equiv C-CH_3$

$IV. CH_3-CH=CH-CH_3$

Number of acidic hydrogen atoms in $but-1-yne$ are

$A$ gas decolourises bromine in $CCl_4$ and forms a precipitate with ammoniacal silver nitrate. The gas is

How many structures are possible for $C_5H_8$ with one triple bond?

Give the main product of the following reactions:
$(i)$ $1,1,2,2-$tetrabromopropane + zinc powder in methanol.
$(ii)$ Reaction occurring on passing hydrogen gas through carbon electrodes at high temperature in an electric arc.