Dehydrohalogenation of Dihalides

Q. Vicinal dihalides on treatment with alcoholic KOH undergoes

1. dehydrohalogenation
2. dehydration
3. dehalogenation
4. None of the above

Q. The reagent(s) for the following conversion
is/are :

1. Alcoholic $KOH$
2. Alcoholic $KOH$ followed by $NaN{H}_2$
3. Aqueous $KOH$ followed by $NaN{H}_2$
4. $Zn/C{H}_{3}OH$