Assertion : Aromatic aldehydes and formaldehyde undergo Cannizzaro reaction. Reason : Those aldehydes which have `alpha`-H atom undergo Cannizzaro rea

Monjur Alahi

Assertion : Aromatic aldehydes and formaldehyde undergo Cannizzaro reaction.
Reason : Those aldehydes which have `alpha`-H atom undergo Cannizzaro reaction.
A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.


0 like 0 dislike
1 views
Share with your friends

1 Answers

Salim Ahmed Kawsar

Call

Correct Answer - C
Aldehydes with no `alpha`-H atoms, undergo Cannizzaro reaction.

0 like 0 dislike
1 views
Talk Doctor Online in Bissoy App
If `A=[[cos alpha, -sin alpha] , [sin alpha, cos alpha]], B=[[cos2beta, sin 2beta] , [sin 2 beta, -cos2beta]]` where `0 lt beta lt pi/2` then prove th

Correct Answer - `alpha =(2pi)/3` `because BAB=A^(-1)` `rArr ABAB= I` `rArr (AB)^(2) = I` Now, `AB= [[cos (alpha+2beta),sin (alpha+2beta)],[sin(alpha+2beta),-cos(alpha + 2beta)]]` and `(AB)^(2) = (AB) (AB) = [[1,0],[0,1]]= I [because (AB)(AB)=I]`...

2 Answers 1 views
If `int tan(x-alpha)tan(x+alpha)*tan2xdx=plog|sec2x|+qlog|sec(x+alpha)|+rlog|sec(x-alpha)|+c` then p+q+r= . . ..

Correct Answer - A We have, `int tan (x - alpha) tan (x + alpha). Tan 2x dx` = plog `|sec 2x| + q log| sec (x + a)| + r...

2 Answers 1 views
Phenol and formaldehyde undergo condensation to give a polymer (A) which on heating with formaldehyde gives a thermosetting polymer (B). Name the poly

(A) Novolac (B ) Bakelite

2 Answers 1 views
Which of the following compounds will undergo Cannizzaro reaction ?

Correct Answer - C Aldehydes with no `alpha`-H atom undergo Cannizzaro reaction on heating with conc. alkali solution. Hence, only `C_(6)H_(5)CHO` will undergo the reaction.

2 Answers 1 views
Assertion : In formaldehyde all the four atoms lie in one plane. Reason : Carbonyl carbon forms a `pi`-bond with oxygen by overlapping of p -orbitals.

Correct Answer - B The carbonyl carbon is `sp^(2)` hybridised and forms three sigma bonds. Thus carbonyl carbon and three atoms attached to it lie in the same plane and `pi`-...

2 Answers 1 views
Assertion : Aromatic aldehydes and ketones undergo electrophilic substitution reaction at metaposition. Reason : Carbonyl group activates the ring tow

Correct Answer - C Carbonyl group is deactivating group.

2 Answers 1 views
An aromatic compound `C_(7)H_(7)Cl` on oxidation gives another aromatic compound which on soda lime deccarboxylation produces benzene. The original co

Correct Answer - C The side chain on oxidation gas oxidised to -COOH group.

2 Answers 1 views
Aromatic aldehydes in the presence of cyanide ion as catalyst, are converted to acyloins. This reaction is called

Correct Answer - C `underset("(Aromatic Aldehyde) ")(C_(6)H_(5)-overset(O)overset(||)C-H+H-overset(O)overset(||)C-C_(6)H_(5))overset("KCN(alc.)")rarrunderset(("Acyloin"))(C_(6)H_(5)-overset(OH)overset("| ")"CH"-overset(O)overset(||)C-C_(6)H_(5))`

2 Answers 1 views
Which of the following compounds can undergo both Cannizzaro reaction as well as Aldol condensation ?

Correct Answer - D `alpha`-Monolkylated aldehydes generally undergo both Cannizzaro reaction as well as Aldol condensation.

2 Answers 1 views
A nucleus with Z =92 emits the following in a sequence: `alpha,beta^(-),beta^(-),alpha,alpha,alpha,alpha,alpha,beta^(-),beta^(-),alpha,beta^(+),beta^(

Correct Answer - B `8 alpha` have been emitted `4 beta^(-)` have been emitted `2 beta^(+)` have emitted `alpha` reduces atomic number by 2 `beta^(-)` increases atomic number by 1 `beta^(+)`...

2 Answers 2 views
X