Types of Nucleophiles

Q.

What is the decreasing order of strengths of the following bases?
$\stackrel{\ominus }{OH},N{H}_2^{\ominus },H-C\equiv C^{\ominus },andC{H}_3-C{H}_2^{\ominus }$

1. $C{H}_3\stackrel{\ominus }{C{H}_2}>\stackrel{\ominus }{N{H}_2}>HC\equiv C^{\ominus }>O{H}^{\ominus }$
2. $\stackrel{\ominus }{N{H}_2}>C{H}_3\stackrel{\ominus }{C{H}_2}>HC\equiv C^{\ominus }>O{H}^{\ominus }$
3. $O{H}^{\ominus }>C{H}_3\stackrel{\ominus }{C{H}_2}>\stackrel{\ominus }{N{H}_2}>HC\equiv C^{\ominus }$
4. $C{H}_3\stackrel{\ominus }{C{H}_2}>HC\equiv C^{\ominus }>\stackrel{\ominus }{N{H}_2}>O{H}^{\ominus }$

Q. In which of the following compounds electron withdrawing group is not present?

1. 
2. 
3. 
4. 

Q.

What is the decreasing order of strengths of the following bases?
$\stackrel{\ominus }{OH},N{H}_2^{\ominus },H-C\equiv C^{\ominus },andC{H}_3-C{H}_2^{\ominus }$

1. $C{H}_3\stackrel{\ominus }{C{H}_2}>\stackrel{\ominus }{N{H}_2}>HC\equiv C^{\ominus }>O{H}^{\ominus }$
2. $\stackrel{\ominus }{N{H}_2}>C{H}_3\stackrel{\ominus }{C{H}_2}>HC\equiv C^{\ominus }>O{H}^{\ominus }$
3. $O{H}^{\ominus }>C{H}_3\stackrel{\ominus }{C{H}_2}>\stackrel{\ominus }{N{H}_2}>HC\equiv C^{\ominus }$
4. $C{H}_3\stackrel{\ominus }{C{H}_2}>HC\equiv C^{\ominus }>\stackrel{\ominus }{N{H}_2}>O{H}^{\ominus }$

Q. In which of the following compounds electron withdrawing group is not present?

1. 
2. 
3. 
4.