Which of the following is food preservatives :
(a) Salt of sorbic acid
(b) Sodium benzoate
(c ) Ethyl benzoate
(d) Alcohol

Options

A. a,b,d
B. a,b,c
C. c,d
D. a,d

Answer

To determine which of the options listed are food preservatives, we will analyze each option based on their properties and uses.

### Step 1: Understand what food preservatives are
Food preservatives are substances added to food to prevent spoilage caused by microorganisms such as bacteria, yeast, and molds. They help extend the shelf life of food products.

**Hint:** Remember that preservatives are used to inhibit the growth of microorganisms.

### Step 2: Analyze each option
- **(a) Salt of sorbic acid**: Sorbic acid and its salts are widely recognized as effective food preservatives. They inhibit the growth of yeast and molds, making them suitable for various food products, including cheese and baked goods.

- **(b) Sodium benzoate**: Sodium benzoate is one of the most common food preservatives. It is effective in acidic foods and beverages, helping to prevent spoilage by inhibiting bacteria and fungi.

- **(c) Ethyl benzoate**: Ethyl benzoate is also used as a food preservative, particularly in baked goods. It helps inhibit the growth of molds and yeasts, although it is less effective against bacteria.

- **(d) Alcohol**: While alcohol can have preservative qualities, it is not commonly classified as a food preservative in the same way as the other options. It is generally used in cooking and as a solvent rather than as a preservative.

### Step 3: Conclusion
From the analysis:
- **(a) Salt of sorbic acid**: Yes, it is a food preservative.
- **(b) Sodium benzoate**: Yes, it is a food preservative.
- **(c) Ethyl benzoate**: Yes, it is a food preservative.
- **(d) Alcohol**: No, it is not primarily considered a food preservative.

Thus, the correct options that are food preservatives are **(a), (b), and (c)**.

### Final Answer
The food preservatives among the options are:
- (a) Salt of sorbic acid
- (b) Sodium benzoate
- (c) Ethyl benzoate