Which of the following reactions cannot form new carbon-carbon bonds?

1. Reimer-Tiemann reaction

2. Cannizaro reaction

3. Wurtz reaction

4. Friedel-Crafts acylation

The correct order of increasing C-X bond reactivity toward nucleophiles among the following is:

I		II
III	\(\left(\mathrm{CH}_3\right)_3 \mathrm{C}-\mathrm{X}\)	IV	\(\left(\mathrm{CH}_3\right)_2 \mathrm{CH}-\mathrm{X}\)

The end product (C) in the below-mentioned reaction is:
\(H_3C-Br\xrightarrow{\bf KCN }A\xrightarrow{ \bf H_3O^+~~}B\xrightarrow[\bf\text{Ether}]{~~LiAlH_4~~}C\)

When hydrolyzed with aqueous KOH, compounds that undergoes racemization are:

(i)		(ii)	CH3CH2CH2Cl
(iii)		(iv)

Which of the following biphenyls is optically active?

1.
2.
3.
4.

A few reactions are given below:

i.	\(\small{\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{Br}+\mathrm{KOH} \rightarrow \mathrm{CH}_3 \mathrm{CH}=\mathrm{CH}_2+\mathrm{KBr}+\mathrm{H}_2 \mathrm{O}}\)
ii.
iii.

In S_N2 substitution reaction of the type

$R - \mathrm{Br} + {\mathrm{Cl}}^{-} \stackrel{\mathrm{DMF}}{\to }R - \mathrm{Cl} + {\mathrm{Br}}^{-},$

Which one of the following has the highest relative rate ?

(1) ${\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CH}}_2\mathrm{Br}$

(2) ${\mathrm{CH}}_3-\underset{\underset{{\mathrm{CH}}_3}{|}}{\mathrm{C}}\mathrm{H}-{\mathrm{CH}}_2\mathrm{Br}$

(3) ${\mathrm{CH}}_3-\underset{\underset{{\mathrm{CH}}_3}{|}}{\overset{\underset{|}{{\mathrm{CH}}_3}}{\mathrm{C}}}-{\mathrm{CH}}_2\mathrm{Br}$

(4) ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{Br}$

Propionic acid with Br₂ /red P yields a dibromo product. Its structure would be

Which one is the most reactive toward S_N1 reaction?

1. C₆H₅CH(C₆H₅)Br

2. C₆H₅CH(CH₃)Br

3. C₆H₅C(CH₃)(C₆H₅)Br

4. C₆H₅CH₂Br