Question

Name a covalent compoune between alkali alkali metal and halogen

Answer 1

No such covalent compound is formed between the alkali metals and halogen as alkali metals have one electron valence and halogen are one electron deficit. Therefore metal transfers electron to halogen and form Electrovalent compound.
Moreover, when electronegativity difference of alkali metals and halogen is very large.

ELECTROVALENT compound are formed when electronegativity difference is very large.
COVALENT compounds are formed when electronegativity difference is not very large.

This all above mentioned proves that no covalent compound is forced between alkali metal and halogen.