Acidity of Alpha Hydrogens

Q. Which of the following aldehydes on chlorination will give a product, which can be used for the synthesis of DDT?

1. $HCHO$
2. $C{H}_{3}CHO$
3. $C{H}_3-(CH=CH)-CHO$
4. $C{H}_{3}C{H}_{2}CHO$

Q. The correct decreasing order of acidic strength is:

1. $N{O}_{2}C{H}_{2}COOH>NCC{H}_{2}COOH>FC{H}_{2}COOH>ClC{H}_{2}COOH$
2. $FC{H}_{2}COOH>NCC{H}_{2}COOH>N{O}_{2}COOH>ClC{H}_{2}COOH$
3. $N{O}_{2}C{H}_{2}COOH>FC{H}_{2}COOH>NCC{H}_{2}COOH>ClC{H}_{2}COOH$
4. $NCC{H}_{2}COOH>N{O}_{2}C{H}_{2}COOH>FC{H}_{2}COOH>ClC{H}_{2}COOH$

Q.

Benzaldehyde differs from acetaldehyde in this respect that the former does not react with

1. Tollens Reagent

2. Fehlings solution

3. HCN

4. NaHSO₃

Q. Which N in the following structures is the most basic?

1. I
2. II
3. III
4. All are equally basic