What Not to Do with Grignard Reagents

Q.

Benzyl alcohol is obtained from benzaldehyde by [CPMT 1983; MNR 1993]

1. Fittig's reaction

2. Cannizaro's reaction

3. Kolbe's reaction

4. Wurtz's reaction

Q.

Rectified spirit obtained by fermentation contains 4.5% of water. So in order to remove it, rectified spirit is mixed with suitable quantity of benzene and heated. Benzene helps because [KCET 1987]

1. It is dehydrating agent and so removes water

2. It forms the lower layer which retains all the water so that alcohol can be distilled off

3. It forms an azeotropic mixture having high boiling point and thus allows the alcohol to distill over

4. It forms low boiling azeotropic mixtures which distill over, leaving behind pure alcohol which can then be distilled

Q.

Alcoholic fermentation is brought about by the action of [CPMT 1977, 79, 88; DPMT 1983]

1. CO₂

2. O₂

3. Invertase

4. Yeast

Q. Chlorination of toluene in the presence of light and heat followed by treatment with aqueous NaOH gives:-

1. o-cresol
2. p-cresol
3. 2, 4-dihydroxy toluene
4. Benzyl alcohol

Q. In the given reaction

$C{H}_3-\stackrel{O}{\stackrel{||}{C}}-O-\underset{C{H}_3}{\underset{|}{\stackrel{C{H}_3}{\stackrel{|}{C}}}}-C{H}_3\stackrel{Na/C_2{H}_{5}OH}{\to }\left(X\right)+\left(Y\right)$

$\left[X\right]and\left[Y\right]$ respectively be:
$\left(a\right)C{H}_3-C{H}_2-OHandC{H}_3-\underset{C{H}_3}{\underset{|}{\stackrel{C{H}_3}{\stackrel{|}{C}}}}-OH$
$\left(b\right)C{H}_3-C{H}_2-OHandC{H}_3-\underset{C{H}_3}{\underset{|}{C}}=C{H}_2$
$\left(c\right)C{H}_2=C{H}_{2}andC{H}_3-\underset{C{H}_3}{\underset{|}{\stackrel{C{H}_3}{\stackrel{|}{C}}}}-OH$
(d) all the above

1. $a$
2. $b$
3. $c$
4. $d$