5 L of an alkane requires 25 L of oxygen for its complete combustion. If all volumes are measured at constant temperature and pressure, the alkane is :

The gas evolved on heating CH₃MgBr in methanol is :

Bouveault-Blanc reduction reaction involves :

Assertion :
Rayon is a semisynthetic polymer whose properties are better than natural cotton.

Reason :
Mechanical and aesthetic properties of cellulose can be improved by acetylation.